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2007 Vol. 37, No. 10
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2007, 37(10): 1-4,8.
doi: 10.13204/j.gyjz200710001
Abstract:
Taking site disposition as the origin of a design, it is exploredthe unique features of different sites, aswell asthe architectural space individualities derived from the site indivi duality, thus constructing an individual overalldesign. It isalso expounded the basic methods of individual overall design of industrial architectures through analyzing four typical basesin practice, as well as their site disposition and the schemes of overall design.
Taking site disposition as the origin of a design, it is exploredthe unique features of different sites, aswell asthe architectural space individualities derived from the site indivi duality, thus constructing an individual overalldesign. It isalso expounded the basic methods of individual overall design of industrial architectures through analyzing four typical basesin practice, as well as their site disposition and the schemes of overall design.
2007, 37(10): 5-8.
doi: 10.13204/j.gyjz200710002
Abstract:
It is minimized the effect of industrial production on environment through the design of all aspects, such asenergy -saving materia-saving, noise reduction, dedusting and waste -recycling etc, as well as the principles of people -oriented and respecting for nature, which embodies the conception of / green building0, and let the factory meet fully thestandards of environmental enterprises.
It is minimized the effect of industrial production on environment through the design of all aspects, such asenergy -saving materia-saving, noise reduction, dedusting and waste -recycling etc, as well as the principles of people -oriented and respecting for nature, which embodies the conception of / green building0, and let the factory meet fully thestandards of environmental enterprises.
2007, 37(10): 9-10,37.
doi: 10.13204/j.gyjz200710003
Abstract:
The individuality and humanization must be manifested in industrial architectures due to the development ofsociety. It is presented in detailthat the spacesof Kunming Hongyun GroupTraining Center and staffs dining room, as wellas their functional designs.
The individuality and humanization must be manifested in industrial architectures due to the development ofsociety. It is presented in detailthat the spacesof Kunming Hongyun GroupTraining Center and staffs dining room, as wellas their functional designs.
2007, 37(10): 11-14.
doi: 10.13204/j.gyjz200710004
Abstract:
The international competition intensifies day by day along with our country joining WTO. Technical reforms ofdomestic cigarette factories are carried out one after another in order to rise to the challenge, which brings a chance forplanning of the prozone of the factory and its single design. It is mainly presented the bidding scheme of technical reform of No.2 Cigarette Factory in Guangzhou to explore the innovative thinkings of planning of prozones and single designs forcigarette factories furtherly.
The international competition intensifies day by day along with our country joining WTO. Technical reforms ofdomestic cigarette factories are carried out one after another in order to rise to the challenge, which brings a chance forplanning of the prozone of the factory and its single design. It is mainly presented the bidding scheme of technical reform of No.2 Cigarette Factory in Guangzhou to explore the innovative thinkings of planning of prozones and single designs forcigarette factories furtherly.
2007, 37(10): 15-16,41.
doi: 10.13204/j.gyjz200710005
Abstract:
It is reviewedthat the design of technical reform project of Changsha Cigarette Factory during the 10thFive -YearPlan and also the experience of design processes, from the design ideas and methods.
It is reviewedthat the design of technical reform project of Changsha Cigarette Factory during the 10thFive -YearPlan and also the experience of design processes, from the design ideas and methods.
2007, 37(10): 17-20,100.
doi: 10.13204/j.gyjz200710006
Abstract:
As important as satisfying the competitionneeds of a public gymnasium, campus gymnasium also shouldmeet therequirements of university and college students communication and performance, offer an multifunctional integrative spacewith functions such as competition, exercise, communication, etc. Based on the retrospection of design and constructionprocess of the gymnasium in Beijing Institute of Technology, it is discussed and analysed how to design campus gymnasiumbetter for the teachers and students in a university.
As important as satisfying the competitionneeds of a public gymnasium, campus gymnasium also shouldmeet therequirements of university and college students communication and performance, offer an multifunctional integrative spacewith functions such as competition, exercise, communication, etc. Based on the retrospection of design and constructionprocess of the gymnasium in Beijing Institute of Technology, it is discussed and analysed how to design campus gymnasiumbetter for the teachers and students in a university.
2007, 37(10): 21-24,49.
doi: 10.13204/j.gyjz200710007
Abstract:
A new hyperboloid metal roof system is used for the gymnasium in Beijing Institute of Technology. The systemhas been largely improved in aspects as antisepsis, enduarance, weatherproofing, waterproofing, ant-i infiltration, drainage,fireproofing, temperature distortion, lightningproofing, heat preservation, sound absorption and insulation, shock absorption,etc as compared to the former roof; which can insure the quality of metal roof system of this project.
A new hyperboloid metal roof system is used for the gymnasium in Beijing Institute of Technology. The systemhas been largely improved in aspects as antisepsis, enduarance, weatherproofing, waterproofing, ant-i infiltration, drainage,fireproofing, temperature distortion, lightningproofing, heat preservation, sound absorption and insulation, shock absorption,etc as compared to the former roof; which can insure the quality of metal roof system of this project.
2007, 37(10): 25-27,45.
doi: 10.13204/j.gyjz200710008
Abstract:
There are many problems on conservation and reuse of historic quarters after moving out the warehouses andfactores, which lead to the loss of original features of the site. By studying, it is analyzed summarized and conserved thetypical elements of quarters rather than conserve the historic buildings of warehouses and factores only in order to continuethe features of the site. On the basis of respecting the texture of the city, reorganize the trait of history and terrain is to bereorganized and the historic quarters revive. In the process, some aspects of design and managing of the city should beconsidered carefully.
There are many problems on conservation and reuse of historic quarters after moving out the warehouses andfactores, which lead to the loss of original features of the site. By studying, it is analyzed summarized and conserved thetypical elements of quarters rather than conserve the historic buildings of warehouses and factores only in order to continuethe features of the site. On the basis of respecting the texture of the city, reorganize the trait of history and terrain is to bereorganized and the historic quarters revive. In the process, some aspects of design and managing of the city should beconsidered carefully.
2007, 37(10): 28-32.
doi: 10.13204/j.gyjz200710009
Abstract:
As an innovative vibration -control system, core -tube buildingswith suspension structures have been evoking theattention of researchers, in which the dampers are set between the core -tube and suspended frames to reduce the dynamicresponse of core -tube suspension structures under seismic loads. Random seismic response of a single core -tube suspensionstructure was then determined by a combination of the complex modal superpositionmethod and pseudo -excitation method inthe frequency domain.Then optimization of arrangement scheme and parameters for damper connection and springconnectionwasperformed to achieve the minimum core -tube topdisplacement and minimum storey drift of suspended frames.Results showed that properly using damper connections and spring connections between the core -tube and suspended framescould reduce random seismic responses significantly
As an innovative vibration -control system, core -tube buildingswith suspension structures have been evoking theattention of researchers, in which the dampers are set between the core -tube and suspended frames to reduce the dynamicresponse of core -tube suspension structures under seismic loads. Random seismic response of a single core -tube suspensionstructure was then determined by a combination of the complex modal superpositionmethod and pseudo -excitation method inthe frequency domain.Then optimization of arrangement scheme and parameters for damper connection and springconnectionwasperformed to achieve the minimum core -tube topdisplacement and minimum storey drift of suspended frames.Results showed that properly using damper connections and spring connections between the core -tube and suspended framescould reduce random seismic responses significantly
2007, 37(10): 33-37.
doi: 10.13204/j.gyjz200710010
Abstract:
Based on the principles of linear optimal active control, this paper develops an optimal active control algorithmcommanding the structure displacement, velocity and acceleration simultaneously, and derives the revisal Riccati equationfrom this. Moreover, the semiactive control has been used for the pulsating wind vibration response of multifunctionalvibration -absorption megaframe structure by means of magnetorheological damper. The result seems to indicate that the sem-iactive controlmay be able to more significantly reduce the vibration acceleration response of the main and the secondaryframes, and to more effectively suppress the vibration displacement response of the main frame than the passive control.
Based on the principles of linear optimal active control, this paper develops an optimal active control algorithmcommanding the structure displacement, velocity and acceleration simultaneously, and derives the revisal Riccati equationfrom this. Moreover, the semiactive control has been used for the pulsating wind vibration response of multifunctionalvibration -absorption megaframe structure by means of magnetorheological damper. The result seems to indicate that the sem-iactive controlmay be able to more significantly reduce the vibration acceleration response of the main and the secondaryframes, and to more effectively suppress the vibration displacement response of the main frame than the passive control.
2007, 37(10): 38-41.
doi: 10.13204/j.gyjz200710011
Abstract:
The shear -lag coefficient and deformation of T -shaped short-leg shear wall are solved based on variationprinciple, various parameters and loading forms which may impact the shear -lag are discussed.The distribution oflongitudinal stress in the flange is analyzed using FEA method.The deformation and stress according to primary beamtheory, variation principle and FEA method are compared, and their impact on the stiffness of the short -leg shear wall isdiscussed
The shear -lag coefficient and deformation of T -shaped short-leg shear wall are solved based on variationprinciple, various parameters and loading forms which may impact the shear -lag are discussed.The distribution oflongitudinal stress in the flange is analyzed using FEA method.The deformation and stress according to primary beamtheory, variation principle and FEA method are compared, and their impact on the stiffness of the short -leg shear wall isdiscussed
2007, 37(10): 42-45.
doi: 10.13204/j.gyjz200710012
Abstract:
The applicabilities of several typical analysis methods for compatibility torsion are compared to each other.Applicable analysis methods must be chosen rationally for different structures. For prestressed concrete edge girders whichare subjected to great compatibility torsion, an analytical method based on variational stiffness is proposed which discountsthe component' s elastic stiffness based on the performance in different loading case. The effect of section positions of slabsand secondary beamswith edge girders is investigated. The effect of torsion carrying capacity owing to prestressedpressure ispresented.Crucial points for this kind of structure design are illuminated, combined with finite element analysis ofengineering examples
The applicabilities of several typical analysis methods for compatibility torsion are compared to each other.Applicable analysis methods must be chosen rationally for different structures. For prestressed concrete edge girders whichare subjected to great compatibility torsion, an analytical method based on variational stiffness is proposed which discountsthe component' s elastic stiffness based on the performance in different loading case. The effect of section positions of slabsand secondary beamswith edge girders is investigated. The effect of torsion carrying capacity owing to prestressedpressure ispresented.Crucial points for this kind of structure design are illuminated, combined with finite element analysis ofengineering examples
2007, 37(10): 46-49.
doi: 10.13204/j.gyjz200710013
Abstract:
The dapped-end beams are the vital supporting members in the dry rigid dapped -end connections in full precastconcrete frame. The dapped-end beams in all destroyed forms are analyzedwith stru-t and-tie modelmethod and shear-frictiontheory, etc, and corresponding design formulas are deduced. Some design advices are put forward. By the analyses of thedapped -end beams with finite element software ANSYS, the design formula is validated. This research has valuableinformation on designing analogical dapped -end -beams.
The dapped-end beams are the vital supporting members in the dry rigid dapped -end connections in full precastconcrete frame. The dapped-end beams in all destroyed forms are analyzedwith stru-t and-tie modelmethod and shear-frictiontheory, etc, and corresponding design formulas are deduced. Some design advices are put forward. By the analyses of thedapped -end beams with finite element software ANSYS, the design formula is validated. This research has valuableinformation on designing analogical dapped -end -beams.
2007, 37(10): 50-53,72.
doi: 10.13204/j.gyjz200710014
Abstract:
On the basis of briefly analyzing the mathematical model for the saturation -unsaturated seepage flow of porousmedium, the selcetion method of such parameters affecting the seepage finite element calculation result as water and soilcharacteristic curve, hydraulic conductivity and capillary water pressure is discussed. In the end, the relative program isused to simulate the seepage field inside the excavation slope during rainfall, and the change law of the underground watertable, saturation of the slope, pressure head and seepage velocity of different positions inside the slope is analyzed. Thesimulation results are rather in agreement with the practical condition, which can provide the evidence for the stabilityanalysis of the slope.
On the basis of briefly analyzing the mathematical model for the saturation -unsaturated seepage flow of porousmedium, the selcetion method of such parameters affecting the seepage finite element calculation result as water and soilcharacteristic curve, hydraulic conductivity and capillary water pressure is discussed. In the end, the relative program isused to simulate the seepage field inside the excavation slope during rainfall, and the change law of the underground watertable, saturation of the slope, pressure head and seepage velocity of different positions inside the slope is analyzed. Thesimulation results are rather in agreement with the practical condition, which can provide the evidence for the stabilityanalysis of the slope.
2007, 37(10): 54-57.
doi: 10.13204/j.gyjz200710015
Abstract:
Regarding multilayer base shake-isolation framework as research object, the influence of SSI effect on baseisolated structure by means of the finite element analysis method is studied. The difference of dynamic characteristic andearthquake response of shake-isolation system which considers SSI effect or not is contrasted. And the influence law ofvarious components of SSI effect to the earthquake response of isolated structure is also discussed. The results indicate that SSI effect has influenced on base isolated structure. In engineering design, isolated structure should not ignore the influenceof SSI effect.
Regarding multilayer base shake-isolation framework as research object, the influence of SSI effect on baseisolated structure by means of the finite element analysis method is studied. The difference of dynamic characteristic andearthquake response of shake-isolation system which considers SSI effect or not is contrasted. And the influence law ofvarious components of SSI effect to the earthquake response of isolated structure is also discussed. The results indicate that SSI effect has influenced on base isolated structure. In engineering design, isolated structure should not ignore the influenceof SSI effect.
2007, 37(10): 58-62.
doi: 10.13204/j.gyjz200710016
Abstract:
The vacuum preloading method is used in highway to treat the soft foundation. The average thickness of the siltlayer is about 10m. The vacuum pressure of 80kPa is applied for 150 days to treat the soft clay layer. The settlement is about1. 0m and the average degree of consolidation is over 90%. The physicomechanical propertiesof the soil change greatly aftertreatment, which proves the effect of vacuum preloading in this project.Meanwhile, the horizonal displacement problemcaused by vacuum preloading is also discussed.
The vacuum preloading method is used in highway to treat the soft foundation. The average thickness of the siltlayer is about 10m. The vacuum pressure of 80kPa is applied for 150 days to treat the soft clay layer. The settlement is about1. 0m and the average degree of consolidation is over 90%. The physicomechanical propertiesof the soil change greatly aftertreatment, which proves the effect of vacuum preloading in this project.Meanwhile, the horizonal displacement problemcaused by vacuum preloading is also discussed.
2007, 37(10): 63-65,83.
doi: 10.13204/j.gyjz200710017
Abstract:
In this testing research, with orthogonal design, it is prepared a high strength concrete (C50) with RA andstudied the influence of water -binder ratio, content of RA, silica fume andfly ash onworkability and compressive strength ofrecycled aggregate concrete (RAC). Testing result shows that slump increases with increasing of water -binder ratio anddecreasing of content of RA and silica fume, fly ash has little effect on slump. Compressive strength develops with thedecrease of water -binder ratio and increase of content of RA and silica fume, fly ash has little effect on compressivestrength. With the development of hydration, the disadvantage effect of RA on compressive strength will reduce.
In this testing research, with orthogonal design, it is prepared a high strength concrete (C50) with RA andstudied the influence of water -binder ratio, content of RA, silica fume andfly ash onworkability and compressive strength ofrecycled aggregate concrete (RAC). Testing result shows that slump increases with increasing of water -binder ratio anddecreasing of content of RA and silica fume, fly ash has little effect on slump. Compressive strength develops with thedecrease of water -binder ratio and increase of content of RA and silica fume, fly ash has little effect on compressivestrength. With the development of hydration, the disadvantage effect of RA on compressive strength will reduce.
2007, 37(10): 66-68,79.
doi: 10.13204/j.gyjz200710018
Abstract:
When mixed with modified polyester fiber, concrete. searly cracks can be decreased. Concrete. s mechanicperformance, capability of impact resistance and impervious behavior can be advanced. When modified polyester fiber isapplied to airport pavement, pavement concrete. s capability of early cracks resistance can be boosted. Modified polyesterfiber can improve pavement. s capability of impact resistance, impervious behavior, freeze -thaw resistance etc. Also it canimprove pavement. s service performance, prolonging service life span, making economic and social benefits.
When mixed with modified polyester fiber, concrete. searly cracks can be decreased. Concrete. s mechanicperformance, capability of impact resistance and impervious behavior can be advanced. When modified polyester fiber isapplied to airport pavement, pavement concrete. s capability of early cracks resistance can be boosted. Modified polyesterfiber can improve pavement. s capability of impact resistance, impervious behavior, freeze -thaw resistance etc. Also it canimprove pavement. s service performance, prolonging service life span, making economic and social benefits.
2007, 37(10): 69-72.
doi: 10.13204/j.gyjz200710019
Abstract:
Based on the experiment on concrete circular columns confined with polyethylene fiber reinforced polymer(PEFRP) sheets and hybrid fiber sheets of PEFRP sheet and carbon FRP (CFRP) sheet, aramid FRP (AFRP) sheet underaxial compression, it is emphasized on analyzing failure configuration, bearing capacity, stress?strain curve and ductility.Results show that PEFRP sheet can significantly improve the ductility of concrete columns; the bearing load of concretecolumn confined with hybrid sheets of PEFRP sheet and CFRP sheet is 91% larger than that of concrete column confinedonly with PEFRP sheets, and its ductility coefficient is 37% larger than that of concrete column confined only with CFRPsheets, which indicates that synergistic effect between PEFRP sheet and CFRP sheet is good.
Based on the experiment on concrete circular columns confined with polyethylene fiber reinforced polymer(PEFRP) sheets and hybrid fiber sheets of PEFRP sheet and carbon FRP (CFRP) sheet, aramid FRP (AFRP) sheet underaxial compression, it is emphasized on analyzing failure configuration, bearing capacity, stress?strain curve and ductility.Results show that PEFRP sheet can significantly improve the ductility of concrete columns; the bearing load of concretecolumn confined with hybrid sheets of PEFRP sheet and CFRP sheet is 91% larger than that of concrete column confinedonly with PEFRP sheets, and its ductility coefficient is 37% larger than that of concrete column confined only with CFRPsheets, which indicates that synergistic effect between PEFRP sheet and CFRP sheet is good.
2007, 37(10): 73-75,87.
doi: 10.13204/j.gyjz200710020
Abstract:
The influences of the addition of limestone powder and the mixed addition of limestone powder and slag on theresistance concrete to chloride ion transport are studied, according to RCM method. The results indicate that the addition ofthe limestone powder wasfoundto have detrimental influence onthe ant-i chloride ion permeability of concretes. The chlorideion diffusion coefficient of the concrete mixedwith slag and limestone powder can be effectively decreased. The ant-i chlorideion permeability of concrete mixed with 20% limestone powder and 10%~ 30% slag can be greatly improved.
The influences of the addition of limestone powder and the mixed addition of limestone powder and slag on theresistance concrete to chloride ion transport are studied, according to RCM method. The results indicate that the addition ofthe limestone powder wasfoundto have detrimental influence onthe ant-i chloride ion permeability of concretes. The chlorideion diffusion coefficient of the concrete mixedwith slag and limestone powder can be effectively decreased. The ant-i chlorideion permeability of concrete mixed with 20% limestone powder and 10%~ 30% slag can be greatly improved.
RESEARCH ON THE RESPONSE SPECTRUM OF ASEISMIC DESIGN FOR CABLE -TRUSS -SUPPORTED GLASS CURTAIN WALLS
2007, 37(10): 76-79.
doi: 10.13204/j.gyjz200710021
Abstract:
Cable -truss -supported glass curtainwalls are a new type of structures, widely used in large public constructions.Researches have been mainly focused on wind resisting of those structures, while the researches on seismism resisting arelittle. The method for constructing nonlinear single degree of freedom (SDOF) was proposed. The nonlinear accelerationspectra were calculated under given conditions and different seismic intensities through time -history analysis method usingmany severest ground motion records. The acceleration response spectrums, average acceleration response spectra andstatistic smoothing design aseismic response spectra were presented. Through an illustration, the resultsof nonlinear responsespectrum method are closed to those of time -history method.
Cable -truss -supported glass curtainwalls are a new type of structures, widely used in large public constructions.Researches have been mainly focused on wind resisting of those structures, while the researches on seismism resisting arelittle. The method for constructing nonlinear single degree of freedom (SDOF) was proposed. The nonlinear accelerationspectra were calculated under given conditions and different seismic intensities through time -history analysis method usingmany severest ground motion records. The acceleration response spectrums, average acceleration response spectra andstatistic smoothing design aseismic response spectra were presented. Through an illustration, the resultsof nonlinear responsespectrum method are closed to those of time -history method.
2007, 37(10): 80-83.
doi: 10.13204/j.gyjz200710022
Abstract:
Bolted T -stub connection ismodeled by a continuous beam with spring supports that are simplified from preloadedbolt and the compacted plates, from which the formula calculating the initial stiffness of T -stub connection is drawn. Bycomparison with the results of tests, finite element analysis and European code, it. s found that the formula can give moreaccurate initial stiffness than European code for non -preloaded T -stub connection, and can give satisfactory result of initialstiffness for preloaded one.
Bolted T -stub connection ismodeled by a continuous beam with spring supports that are simplified from preloadedbolt and the compacted plates, from which the formula calculating the initial stiffness of T -stub connection is drawn. Bycomparison with the results of tests, finite element analysis and European code, it. s found that the formula can give moreaccurate initial stiffness than European code for non -preloaded T -stub connection, and can give satisfactory result of initialstiffness for preloaded one.
2007, 37(10): 84-87.
doi: 10.13204/j.gyjz200710023
Abstract:
Based on 3 factors of stud diameter and concrete intensity and steel fibre, orthogonal push -off tests of weldedstud shear connectorswere conducted. The analysis of range and variance shows that the steel fiber inside concrete has noeffect on ultimate carrying capacity and shear rigidity of stud. Shear rigidity of stud increases as concrete intensity. Therelation between shear rigidity and slip is hyperbolic function. Formulae calculating ultimate carrying capacity and shearrigidity of stud are given. The repeat load tests show that the slip is no comeback with unloading even if low -shear.
Based on 3 factors of stud diameter and concrete intensity and steel fibre, orthogonal push -off tests of weldedstud shear connectorswere conducted. The analysis of range and variance shows that the steel fiber inside concrete has noeffect on ultimate carrying capacity and shear rigidity of stud. Shear rigidity of stud increases as concrete intensity. Therelation between shear rigidity and slip is hyperbolic function. Formulae calculating ultimate carrying capacity and shearrigidity of stud are given. The repeat load tests show that the slip is no comeback with unloading even if low -shear.
2007, 37(10): 88-92.
doi: 10.13204/j.gyjz200710024
Abstract:
Test program on the shear behavior of stressed skin diaphragm using profiled sheets connected by the self-tapping screws was carried out, which are constructed according to the detailing in practical engineering. The effects ofdifferent sheeting sections and purlin distances on the shear behavior of shin diaphragm were studied by analyzing the failuremodes and shear capacities of the panel. Finite element analysis of the experimental specimen was conducted by use of theANSYS package, considering nonlinearity caused by the large deflection and slip of fasteners. The experimental data werecompared with the results acquired by finite element analysis. Itwas provedthat ANSYS can be used to analyze the stressedskin diaphragm, and that finite element analysis can provide substitute method for the repeated full scale tests.
Test program on the shear behavior of stressed skin diaphragm using profiled sheets connected by the self-tapping screws was carried out, which are constructed according to the detailing in practical engineering. The effects ofdifferent sheeting sections and purlin distances on the shear behavior of shin diaphragm were studied by analyzing the failuremodes and shear capacities of the panel. Finite element analysis of the experimental specimen was conducted by use of theANSYS package, considering nonlinearity caused by the large deflection and slip of fasteners. The experimental data werecompared with the results acquired by finite element analysis. Itwas provedthat ANSYS can be used to analyze the stressedskin diaphragm, and that finite element analysis can provide substitute method for the repeated full scale tests.
2007, 37(10): 93-97.
doi: 10.13204/j.gyjz200710025
Abstract:
As a new style stiffens measure to CHS joints, IGP was successfully applied to Guangdong Science Center. Twotypical CHS joints were chosen, and elastoplastic FEM method has been used for analyzing. Structure behavior wasunderstood under the influence of posting gusset plate to tubular joints, and the feasibility of this stiffen joints was testified.
As a new style stiffens measure to CHS joints, IGP was successfully applied to Guangdong Science Center. Twotypical CHS joints were chosen, and elastoplastic FEM method has been used for analyzing. Structure behavior wasunderstood under the influence of posting gusset plate to tubular joints, and the feasibility of this stiffen joints was testified.
2007, 37(10): 98-100.
doi: 10.13204/j.gyjz200710026
Abstract:
It is analysed and discussed that the factors affecting the design working life for strengthening on existingstructure or its members. And it is also put forward some advices to the design working life for strengthening the existingstructure by considering the engineering experience. Which may be a reference for strengthening designs.
It is analysed and discussed that the factors affecting the design working life for strengthening on existingstructure or its members. And it is also put forward some advices to the design working life for strengthening the existingstructure by considering the engineering experience. Which may be a reference for strengthening designs.
2007, 37(10): 101-105,111.
doi: 10.13204/j.gyjz200710027
Abstract:
Prestress technology is an effective way to use the high strength of FRP composite. The experimental study onflexural performance of strengthening RC beams using prestressed aramid fiber reinforced plastic (AFRP) sheets isconducted, and the effects of different prestress level on the propertiesof flexural load, stiffness and ductility are analyzed.Results show that, when prestress level is 55%～ 65%, the cracking load, yield load and ultimate load of RC beamsstrengthened with prestressed AFRP sheets are 147%～ 165%, 28%～ 50%, 13%～ 31% larger than that of RC beamsstrengthened with non -prestressed AFRP sheets, validating the effectiveness of prestressed AFRP sheet retrofit.The failurepattern of prestressed AFRP sheets is fracture, but that of non-prestressed AFRP sheets is debonding.Based on theexperimental study, an elastoplastic section analysis method is conducted to predict the loads of beams, the results from thetheoretical predictions and the experiment agree well.
Prestress technology is an effective way to use the high strength of FRP composite. The experimental study onflexural performance of strengthening RC beams using prestressed aramid fiber reinforced plastic (AFRP) sheets isconducted, and the effects of different prestress level on the propertiesof flexural load, stiffness and ductility are analyzed.Results show that, when prestress level is 55%～ 65%, the cracking load, yield load and ultimate load of RC beamsstrengthened with prestressed AFRP sheets are 147%～ 165%, 28%～ 50%, 13%～ 31% larger than that of RC beamsstrengthened with non -prestressed AFRP sheets, validating the effectiveness of prestressed AFRP sheet retrofit.The failurepattern of prestressed AFRP sheets is fracture, but that of non-prestressed AFRP sheets is debonding.Based on theexperimental study, an elastoplastic section analysis method is conducted to predict the loads of beams, the results from thetheoretical predictions and the experiment agree well.
2007, 37(10): 106-107.
doi: 10.13204/j.gyjz200710028
Abstract:
Because of function change and increasing load, the reinforced concrete plates must be strengthened. The externalprestreeing strengthening technology of the plates by unbond steel strand is adopted, practice proved that this technology canimprove the bearing capacity, strengthening effect is good, and the construction is convenient.
Because of function change and increasing load, the reinforced concrete plates must be strengthened. The externalprestreeing strengthening technology of the plates by unbond steel strand is adopted, practice proved that this technology canimprove the bearing capacity, strengthening effect is good, and the construction is convenient.
2007, 37(10): 108-111.
doi: 10.13204/j.gyjz200710029
Abstract:
Currently the condition of a chimney can' t satisfies the normal usage and request of durability but also possiblythreatens structure' s safety. It is studied the reliability and reinforcementtechnique for it. In light of usage condition and theresult of calculation and analysis, the reason for chimney impairment and defect are analyzed. It is also made an evaluationof the chimney' s reliability.Aiming at the problem of the chimney, it is established the feasible maintenance andreinforcement scheme. Finally, it is carried out a thermodynamical analysis of the effect of the reinforcement by ANSYS.The evaluation of chimney reliability is made.
Currently the condition of a chimney can' t satisfies the normal usage and request of durability but also possiblythreatens structure' s safety. It is studied the reliability and reinforcementtechnique for it. In light of usage condition and theresult of calculation and analysis, the reason for chimney impairment and defect are analyzed. It is also made an evaluationof the chimney' s reliability.Aiming at the problem of the chimney, it is established the feasible maintenance andreinforcement scheme. Finally, it is carried out a thermodynamical analysis of the effect of the reinforcement by ANSYS.The evaluation of chimney reliability is made.
2007, 37(10): 112-114.
doi: 10.13204/j.gyjz200710030
Abstract:
Arched corrugated steel roof is often used for storage buildings because of its low cost and shorter construction time.The related technical regulations was carried out until 2005 because of the limited research,and collapse accidents were occurred frequently in China because the unified methods were not existing before this time.A typical accident was analyzed based on different calculate methods,wind load and wind dynamical action were also discussed.The collapse was mainly because of the wind load and wind dynamical action.The wind load value should be considered according to the structure location.The methods which the regulations adopted are safe,it can be used in practice.
Arched corrugated steel roof is often used for storage buildings because of its low cost and shorter construction time.The related technical regulations was carried out until 2005 because of the limited research,and collapse accidents were occurred frequently in China because the unified methods were not existing before this time.A typical accident was analyzed based on different calculate methods,wind load and wind dynamical action were also discussed.The collapse was mainly because of the wind load and wind dynamical action.The wind load value should be considered according to the structure location.The methods which the regulations adopted are safe,it can be used in practice.
2007, 37(10): 115-117.
doi: 10.13204/j.gyjz200710031
Abstract:
This paper mainly presented the design and the construction of extra -long overhanging scaffold. This kind ofstructure is constitute by section steel which stretches outside and pull with the steel wire rope under construction, thenoverhanging gradually for layers. And the corresponding steel ropes are used for the structure to guarantee the safety.According to analysis and calculation, then considering the structure of each joint, thus the scheme of an integratedoverhanging scaffold is designed, which is well used in the project.
This paper mainly presented the design and the construction of extra -long overhanging scaffold. This kind ofstructure is constitute by section steel which stretches outside and pull with the steel wire rope under construction, thenoverhanging gradually for layers. And the corresponding steel ropes are used for the structure to guarantee the safety.According to analysis and calculation, then considering the structure of each joint, thus the scheme of an integratedoverhanging scaffold is designed, which is well used in the project.
