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2004 Vol. 34, No. 12
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2004, 34(12): 1-5,22.
doi: 10.13204/j.gyjz200412001
Abstract:
It is classified and discussed th at some key technical problems met in the construction process of large span ste el structures.These problems are as follows:(1)stability checking of the structur e and component members during the lifting process;(2)pulley-structure analysis under applied loads;(3)temporary supports influence on the structural safety;(4)sa fety problem due to the removal of the temporary supports;(5)tracing analytical c omputation and method for the pre-stress steel structure during the constructio n process;(6)continuous tracing computational approach in structural erection pro cess;(7)computation and forming of flexible structures;8)design and computation o f integral hoisting of the large span structures.
It is classified and discussed th at some key technical problems met in the construction process of large span ste el structures.These problems are as follows:(1)stability checking of the structur e and component members during the lifting process;(2)pulley-structure analysis under applied loads;(3)temporary supports influence on the structural safety;(4)sa fety problem due to the removal of the temporary supports;(5)tracing analytical c omputation and method for the pre-stress steel structure during the constructio n process;(6)continuous tracing computational approach in structural erection pro cess;(7)computation and forming of flexible structures;8)design and computation o f integral hoisting of the large span structures.
2004, 34(12): 6-11.
doi: 10.13204/j.gyjz200412002
Abstract:
Because of the merits of the integral hoisting in structural construct ion, i.e., simple construction instrument applied, assembling on the ground, hig h efficiency and safety, it has become the main special approaches for long-spa n steel structure construction recent years. It should be noted that during the p rocess of integral hoisting of steel structure, its displacement and stress dist ribution in the structures differ from their design condition, and the checking of stability and strength of members or structure become necessary. Some strengt h or stability-reinforce approaches to some members or structures must be emplo ye d for their construction safety. This paper presents the design of integral hois ting project of China southern airlines aircraft hangar and the structural techn ology problems involved in integral hoisting process. The integral hoisting proc ess and their details for this hangar are also described and discussed.
Because of the merits of the integral hoisting in structural construct ion, i.e., simple construction instrument applied, assembling on the ground, hig h efficiency and safety, it has become the main special approaches for long-spa n steel structure construction recent years. It should be noted that during the p rocess of integral hoisting of steel structure, its displacement and stress dist ribution in the structures differ from their design condition, and the checking of stability and strength of members or structure become necessary. Some strengt h or stability-reinforce approaches to some members or structures must be emplo ye d for their construction safety. This paper presents the design of integral hois ting project of China southern airlines aircraft hangar and the structural techn ology problems involved in integral hoisting process. The integral hoisting proc ess and their details for this hangar are also described and discussed.
2004, 34(12): 12-14,35.
doi: 10.13204/j.gyjz200412003
Abstract:
The installation scheme and analysis procedure of the steel roof of Macao Gym are presented. First, the interaction between main and secondary trusses in the roof is analyzed to identify their individual contributions to ap plied loading. Based on the results obtained above, the installation approach an d steps of the secondary trusses is determined. Then the internal forces, deform ation and support reaction in the trusses are traced and calculated during full construction process. The obtained results verify the applicability of the insta llation approach, and the joining gap between main and secondary trusses is suit able. Finally, according to the data provided from piling settlement experiment, the effect of the reaction and settlement on the steel roof structure performan ce is determined and the roof safety in the state of uneven settlement is chec ked.
The installation scheme and analysis procedure of the steel roof of Macao Gym are presented. First, the interaction between main and secondary trusses in the roof is analyzed to identify their individual contributions to ap plied loading. Based on the results obtained above, the installation approach an d steps of the secondary trusses is determined. Then the internal forces, deform ation and support reaction in the trusses are traced and calculated during full construction process. The obtained results verify the applicability of the insta llation approach, and the joining gap between main and secondary trusses is suit able. Finally, according to the data provided from piling settlement experiment, the effect of the reaction and settlement on the steel roof structure performan ce is determined and the roof safety in the state of uneven settlement is chec ked.
2004, 34(12): 15-18,31.
doi: 10.13204/j.gyjz200412004
Abstract:
Shenzhen Convention and Exhibition Centre is one of the most important municipal projects of Shenzhen. The steel arch structure with double box-girde r s is used in the roof-structures. To decrease the horizontal acting forces on t he main-structure produced by arch self weight and to meet architecture requir ements, pre-arch and special construction technology are employed. The arch str u cture is hinged in one end and sliding in another during the assembling, and fin a lly it is totally fixed in both ends after the horizontal sliding is finished. F urthermore, lateral instability checking of the steel arch structure due to wind is done for the double box-girders in the first stage of construction. Finally ,an initial analysis of steel-bar used as tensile rod in the roof-struc tures is also conducted.
Shenzhen Convention and Exhibition Centre is one of the most important municipal projects of Shenzhen. The steel arch structure with double box-girde r s is used in the roof-structures. To decrease the horizontal acting forces on t he main-structure produced by arch self weight and to meet architecture requir ements, pre-arch and special construction technology are employed. The arch str u cture is hinged in one end and sliding in another during the assembling, and fin a lly it is totally fixed in both ends after the horizontal sliding is finished. F urthermore, lateral instability checking of the steel arch structure due to wind is done for the double box-girders in the first stage of construction. Finally ,an initial analysis of steel-bar used as tensile rod in the roof-struc tures is also conducted.
2004, 34(12): 19-22.
doi: 10.13204/j.gyjz200412005
Abstract:
The New Leifeng Pagoda has been built for restoring the evening glow of Leifeng, which is the Ten Views of West Lake.It sets a precedent for rebuilding an ancien t structure with steel framed structure domestically. The projects general situation and structure style choosing are introduced in t he paper.The design and construction of the foundation and the upper structures, special construction nodes and the fireproofing,antirust of steel structure are summarized in detail.
The New Leifeng Pagoda has been built for restoring the evening glow of Leifeng, which is the Ten Views of West Lake.It sets a precedent for rebuilding an ancien t structure with steel framed structure domestically. The projects general situation and structure style choosing are introduced in t he paper.The design and construction of the foundation and the upper structures, special construction nodes and the fireproofing,antirust of steel structure are summarized in detail.
2004, 34(12): 23-26,58.
doi: 10.13204/j.gyjz200412006
Abstract:
In concrete filled steel tube column with steel beam system, strengthe ning plate ring is widely used, so it is important for engineers to get some kno wledge about this kind of joint. In the past, tests and researches are mainly f ocused on the form of perpendicular joint of column with beam. There has been little study on the multi-dimensions joints by far. On the basis of six concrete filled joi n ts with non-perpendicular elements experiments,a study is conducted on the beha vior of the joints in whole process under static load. Some useful suggestions are g iven for design, and empirical formula for the bearing capacity of this kind of joints is proposed.
In concrete filled steel tube column with steel beam system, strengthe ning plate ring is widely used, so it is important for engineers to get some kno wledge about this kind of joint. In the past, tests and researches are mainly f ocused on the form of perpendicular joint of column with beam. There has been little study on the multi-dimensions joints by far. On the basis of six concrete filled joi n ts with non-perpendicular elements experiments,a study is conducted on the beha vior of the joints in whole process under static load. Some useful suggestions are g iven for design, and empirical formula for the bearing capacity of this kind of joints is proposed.
2004, 34(12): 27-31.
doi: 10.13204/j.gyjz200412007
Abstract:
The experimental research on the model of steel t russ with rectangular tube members for new terminal building of Chongqing Jiangb ei Airport is reported. The main truss and the lateral braces were simulated in the test. The results of linear finite element analysis match the experimental r esults well both in interior forces and deformations. It is also shown that the designed truss can meet the demands of capacities and stiffness. The further non linear analysis shows that lateral braces have obvious effects on bearing capaci ty of the main truss.
The experimental research on the model of steel t russ with rectangular tube members for new terminal building of Chongqing Jiangb ei Airport is reported. The main truss and the lateral braces were simulated in the test. The results of linear finite element analysis match the experimental r esults well both in interior forces and deformations. It is also shown that the designed truss can meet the demands of capacities and stiffness. The further non linear analysis shows that lateral braces have obvious effects on bearing capaci ty of the main truss.
2004, 34(12): 32-35.
doi: 10.13204/j.gyjz200412008
Abstract:
Crystal stone lobby of Shenzhen Children's Palace is a complicated structure combined by outer frame of 16 steel pipe columns and inner ellipse shell spatial truss. The columns of outer frame are braced by fra me beams along ring direction and by no radial mid support. So their slender ra tios along radial direction are greater than the allowable ones regulated by ste el design codes. In order to study the seismic performance of this type of struc ture, a shaking table test of 1/20 structural model is carried out and is also a n alyzed with SAP2000. It is found that its deformation response can meet the requ irements of relevant codes.
Crystal stone lobby of Shenzhen Children's Palace is a complicated structure combined by outer frame of 16 steel pipe columns and inner ellipse shell spatial truss. The columns of outer frame are braced by fra me beams along ring direction and by no radial mid support. So their slender ra tios along radial direction are greater than the allowable ones regulated by ste el design codes. In order to study the seismic performance of this type of struc ture, a shaking table test of 1/20 structural model is carried out and is also a n alyzed with SAP2000. It is found that its deformation response can meet the requ irements of relevant codes.
2004, 34(12): 36-38.
doi: 10.13204/j.gyjz200412009
Abstract:
From the aspect of peoples physiological behavi o r and mantal sense, this article analyzes the planning and design of pedestrian street, stresses the environmental design concept of respecting human needs and provides a theoretical basis for creating urban street space.
From the aspect of peoples physiological behavi o r and mantal sense, this article analyzes the planning and design of pedestrian street, stresses the environmental design concept of respecting human needs and provides a theoretical basis for creating urban street space.
2004, 34(12): 39-41,50.
doi: 10.13204/j.gyjz200412010
Abstract:
The effects of the applied technology on human ha bitat, healthy importance and the sustainable development of ecological environm ent were expounded through analyzing the applied technology of a healthy residen tial building. It was also proposed that the technical measures and criteria tha t should be used during the construction of the healthy residential building.
The effects of the applied technology on human ha bitat, healthy importance and the sustainable development of ecological environm ent were expounded through analyzing the applied technology of a healthy residen tial building. It was also proposed that the technical measures and criteria tha t should be used during the construction of the healthy residential building.
2004, 34(12): 42-44,47.
doi: 10.13204/j.gyjz200412011
Abstract:
A new type of aseismic structural systemfrict ion damping shear wall is proposed. It is studied that the failure mechanism and mode of the friction damping shear wall under repeated loadings through tests o f three shear walls. The ductility and energy disspation are compared among a mo nolithic shear wall, a slit shear wall and a shear wall with slit and damper. Th e results show that the ductility, energy disspation and dynamic response of the friction damping shear wall are much better than those of other types of shear walls, by which the damage to a structure under earthquake can be decreased.
A new type of aseismic structural systemfrict ion damping shear wall is proposed. It is studied that the failure mechanism and mode of the friction damping shear wall under repeated loadings through tests o f three shear walls. The ductility and energy disspation are compared among a mo nolithic shear wall, a slit shear wall and a shear wall with slit and damper. Th e results show that the ductility, energy disspation and dynamic response of the friction damping shear wall are much better than those of other types of shear walls, by which the damage to a structure under earthquake can be decreased.
2004, 34(12): 45-47.
doi: 10.13204/j.gyjz200412012
Abstract:
Modal parameter identification of frame structure s under ambient excitation is studied. To verify the effectiveness of natural ex citation technique and eigensystem realization algorithm (NExT/ERA), numeric sim ulation of an 8 storey model frame structure was carried out. During the simula tion, practical factors such as acceleration measuring, noise of sensors and num bers of sensors were accounted. It reveals that NExT/ERA is suitable for frame s tructures monitoring and diagnosis.
Modal parameter identification of frame structure s under ambient excitation is studied. To verify the effectiveness of natural ex citation technique and eigensystem realization algorithm (NExT/ERA), numeric sim ulation of an 8 storey model frame structure was carried out. During the simula tion, practical factors such as acceleration measuring, noise of sensors and num bers of sensors were accounted. It reveals that NExT/ERA is suitable for frame s tructures monitoring and diagnosis.
2004, 34(12): 48-50.
doi: 10.13204/j.gyjz200412013
Abstract:
The internal force, stress distribution and its changing law of no-hole continu ous wall beams are analyzed by diagrams, using finite element method, and thus t he interactive forces between the no-hole continuous wall beams and joists can be computed, i.e. the law of changing in the internal forces and the stress in t he tests can also be verified; and the laws that can not be found by the tests c an be obtained, which can provide a more precise theoretical basis for the desig n of the wall beams.
The internal force, stress distribution and its changing law of no-hole continu ous wall beams are analyzed by diagrams, using finite element method, and thus t he interactive forces between the no-hole continuous wall beams and joists can be computed, i.e. the law of changing in the internal forces and the stress in t he tests can also be verified; and the laws that can not be found by the tests c an be obtained, which can provide a more precise theoretical basis for the desig n of the wall beams.
2004, 34(12): 51-53.
doi: 10.13204/j.gyjz200412014
Abstract:
The relevant codes of China and Russia s how that the ratio of mass eccentricity distance from the center of foundation b ase area to foundation side length in parallel with eccentricity direction is li mited to 3% or 5% under different conditions.The paper has studied the effect of mass eccentricity on natural frequencies of foundation under different conditions, meanwhile, put forward the suggestion on relaxing the limitation.
The relevant codes of China and Russia s how that the ratio of mass eccentricity distance from the center of foundation b ase area to foundation side length in parallel with eccentricity direction is li mited to 3% or 5% under different conditions.The paper has studied the effect of mass eccentricity on natural frequencies of foundation under different conditions, meanwhile, put forward the suggestion on relaxing the limitation.
2004, 34(12): 54-58.
doi: 10.13204/j.gyjz200412015
Abstract:
By means of the current largest model box in domestic geotechnical centrifuges and 400gt centrifuge, the foundation of cargo field and its substratum have been studied. The deformation process under 28m thick silty sand fill and 55kN/m2 working load,the time-settlement curve, as well as the compressive deformation, density, modulus of compressibility and bearing capacity of filled sand itself along depth were simulated and predicted. It is indicated that the centrifuge te st results have guidable significance to reasonable determining of both cubic metre of filled sand and the scheme, the depth and the degree of soil improvement.
By means of the current largest model box in domestic geotechnical centrifuges and 400gt centrifuge, the foundation of cargo field and its substratum have been studied. The deformation process under 28m thick silty sand fill and 55kN/m2 working load,the time-settlement curve, as well as the compressive deformation, density, modulus of compressibility and bearing capacity of filled sand itself along depth were simulated and predicted. It is indicated that the centrifuge te st results have guidable significance to reasonable determining of both cubic metre of filled sand and the scheme, the depth and the degree of soil improvement.
2004, 34(12): 59-60,97.
doi: 10.13204/j.gyjz200412016
Abstract:
The anchorage performance of GFRP rock b olt is studied by the material test of GFRP threaded rod with a diameter of 25mm and its pull-out test of grouting anchorage. The study shows that the tensile capacity of GFRP threaded rod is higher than that of a steel bar with same diame ter, yet its potential can not be in full play. It is indicated by the pull-out test that the load-slip curve of GFRP material is also similar to that of a th readed steel, but its maximum pull-out force is about 30% less than the latter, which shows that the superiority of GFRP material can not be in full play by or dinary mortar anchorage.
The anchorage performance of GFRP rock b olt is studied by the material test of GFRP threaded rod with a diameter of 25mm and its pull-out test of grouting anchorage. The study shows that the tensile capacity of GFRP threaded rod is higher than that of a steel bar with same diame ter, yet its potential can not be in full play. It is indicated by the pull-out test that the load-slip curve of GFRP material is also similar to that of a th readed steel, but its maximum pull-out force is about 30% less than the latter, which shows that the superiority of GFRP material can not be in full play by or dinary mortar anchorage.
2004, 34(12): 61-62.
doi: 10.13204/j.gyjz200412017
Abstract:
It was studied that the effect of addition of lithium slag and silica fume on th e strength and fluidity of concrete; according to the data obtained from the tes t, the rule of 28 day compressive strength of concrete inner added with lithium slag and silica fume was summarized, and the increasing rule of later stage stre ngth of concrete was also studied. A high strength and high fluidity concrete (1 00MPa) can be prepared using grade 42\^5 ordinary Portland cement, medium sand, 5～25mm broken stone, addition of 10%～15% lithium slag and 5% silica fume, wate r cementitious materials ratio 0\^255～0\^268, or inner added 0～15% lithium slag an d 10% silica fume, water cementitious materials 0\^260～0\^305, and proper quant ity of NF-2-6 retarding high effect water-reducing agent.
It was studied that the effect of addition of lithium slag and silica fume on th e strength and fluidity of concrete; according to the data obtained from the tes t, the rule of 28 day compressive strength of concrete inner added with lithium slag and silica fume was summarized, and the increasing rule of later stage stre ngth of concrete was also studied. A high strength and high fluidity concrete (1 00MPa) can be prepared using grade 42\^5 ordinary Portland cement, medium sand, 5～25mm broken stone, addition of 10%～15% lithium slag and 5% silica fume, wate r cementitious materials ratio 0\^255～0\^268, or inner added 0～15% lithium slag an d 10% silica fume, water cementitious materials 0\^260～0\^305, and proper quant ity of NF-2-6 retarding high effect water-reducing agent.
2004, 34(12): 63-66.
doi: 10.13204/j.gyjz200412018
Abstract:
Two types of ecological reactive powder concretes (ECO-RPC) were prepared by substitution of ultra-fine industrial was te for 50%～60% cement by weight and replacement of ground fine quartz sand with natural fine sand. Through Hopkinson bar experiment the effect of strain rate, s teel fiber volume fraction and matrix composition on the dynamic mechanical prop erties and fracture pattern of ECO-RPC were researched.The results showed that ECO-RPC has strain rate strengthen effect. Peak stress and strain at peak stres s increase with the increase of strain rate.The dynamic mechanical prope rties of fiber reinforced ECO-RPC are superior to those of ECO-RPC matrix and ECO-RPC with fiber shows great toughness and ductility during the course of fra cture.The composition effects of ultra-fine industrial waste give benefit for t he matrix micro-structure and strengthen the bond between fiber and matrix so a s to make fracture pattern change from brittleness to toughness.
Two types of ecological reactive powder concretes (ECO-RPC) were prepared by substitution of ultra-fine industrial was te for 50%～60% cement by weight and replacement of ground fine quartz sand with natural fine sand. Through Hopkinson bar experiment the effect of strain rate, s teel fiber volume fraction and matrix composition on the dynamic mechanical prop erties and fracture pattern of ECO-RPC were researched.The results showed that ECO-RPC has strain rate strengthen effect. Peak stress and strain at peak stres s increase with the increase of strain rate.The dynamic mechanical prope rties of fiber reinforced ECO-RPC are superior to those of ECO-RPC matrix and ECO-RPC with fiber shows great toughness and ductility during the course of fra cture.The composition effects of ultra-fine industrial waste give benefit for t he matrix micro-structure and strengthen the bond between fiber and matrix so a s to make fracture pattern change from brittleness to toughness.
2004, 34(12): 67-69,90.
doi: 10.13204/j.gyjz200412019
Abstract:
Based on 72 HRB500 steel bar specimens pull-out tests,it is investigated that the bond-anchorage properties of HRB500 steel bar s and the main factors influencing the bond capacity between HRB500 steel bars a nd concrete.Then the calculating formula of bond length has been established thr ough statistical regression,and the formula on critical anchoring length of HRB5 00 steel bars is also deduced.In the end,the design of anchoring length by way o f reliability analysis of HRB500 steel bars concrete elements are proposed.
Based on 72 HRB500 steel bar specimens pull-out tests,it is investigated that the bond-anchorage properties of HRB500 steel bar s and the main factors influencing the bond capacity between HRB500 steel bars a nd concrete.Then the calculating formula of bond length has been established thr ough statistical regression,and the formula on critical anchoring length of HRB5 00 steel bars is also deduced.In the end,the design of anchoring length by way o f reliability analysis of HRB500 steel bars concrete elements are proposed.
2004, 34(12): 70-72.
doi: 10.13204/j.gyjz200412020
Abstract:
It is analyzed that the gap between China and oth er maturely-applying countries in the field of design and construction of mason ry buildings and the reasons of the gap.In addition,it is proposed that masonry-unit buildings of multi-storeys should also be computed in light of reinforci n g-bar masonry units in the process of structural design.As a result,under the p remise of structural safety,the building cost is reduced and the construction qu ality is improved through suitable shapes of masonry units and construction meth ods.
It is analyzed that the gap between China and oth er maturely-applying countries in the field of design and construction of mason ry buildings and the reasons of the gap.In addition,it is proposed that masonry-unit buildings of multi-storeys should also be computed in light of reinforci n g-bar masonry units in the process of structural design.As a result,under the p remise of structural safety,the building cost is reduced and the construction qu ality is improved through suitable shapes of masonry units and construction meth ods.
2004, 34(12): 73-75.
doi: 10.13204/j.gyjz200412021
Abstract:
To cater for the need of wall reform in China,sev eral new kinds of house buildings of seismic structural systems with energy effi ciency are briefly introduced,including their characteristics and situation of a pplication and researches.
To cater for the need of wall reform in China,sev eral new kinds of house buildings of seismic structural systems with energy effi ciency are briefly introduced,including their characteristics and situation of a pplication and researches.
2004, 34(12): 76-79.
doi: 10.13204/j.gyjz200412022
Abstract:
The cable-edged membrane structure is the most w idespread structural style of a membrane structure. It had been introduced that the design principle and the detailing for such type of membrane structure; two design examples had been presented.
The cable-edged membrane structure is the most w idespread structural style of a membrane structure. It had been introduced that the design principle and the detailing for such type of membrane structure; two design examples had been presented.
2004, 34(12): 80-82,66.
doi: 10.13204/j.gyjz200412023
Abstract:
Two reinforced concrete frames under cyclic horiz ontal loading were tested. One of which was strengthened with external prestress ing steel tendons. The effect of strengthening frame with external prestressing steel tendons on seismic ability was studied. A program using nonlinear FEM was coded to analyse that. The analytic result fit the experimental result well. Som e conclusions were gotten from that.
Two reinforced concrete frames under cyclic horiz ontal loading were tested. One of which was strengthened with external prestress ing steel tendons. The effect of strengthening frame with external prestressing steel tendons on seismic ability was studied. A program using nonlinear FEM was coded to analyse that. The analytic result fit the experimental result well. Som e conclusions were gotten from that.
2004, 34(12): 83-84.
doi: 10.13204/j.gyjz200412024
Abstract:
Via bonding mechanism and experimental study, the necessity of exerting contact pressure to the bonding interface between fiber s heets and concrete was indicated. A convenient and practical construction techni que of hydraulic pad-exerting-pressure was proposed. An application of the pro posed method in the strengthening of roofing beams of a university library in So uth China was described.
Via bonding mechanism and experimental study, the necessity of exerting contact pressure to the bonding interface between fiber s heets and concrete was indicated. A convenient and practical construction techni que of hydraulic pad-exerting-pressure was proposed. An application of the pro posed method in the strengthening of roofing beams of a university library in So uth China was described.
2004, 34(12): 85-86,99.
doi: 10.13204/j.gyjz200412025
Abstract:
A theoretical analysis of end anchorage of RC beams strengthened with fiber shee ts is carried out using a model of arch truss, in which the effect of inclined cracks on the strengthening effectiveness is taken into account, and a simplifie d calculation model of the arch truss is also established.The analysis of determ ining strengthening position and the theoretical breaking point of fiber sheets is also conducted. The necessary bonding force at the end of fiber sheets, H is obtained through the theoretical analysis, thus defining the anchorage length l f.
A theoretical analysis of end anchorage of RC beams strengthened with fiber shee ts is carried out using a model of arch truss, in which the effect of inclined cracks on the strengthening effectiveness is taken into account, and a simplifie d calculation model of the arch truss is also established.The analysis of determ ining strengthening position and the theoretical breaking point of fiber sheets is also conducted. The necessary bonding force at the end of fiber sheets, H is obtained through the theoretical analysis, thus defining the anchorage length l f.
2004, 34(12): 87-88,95.
doi: 10.13204/j.gyjz200412026
Abstract:
Based on an example of renovation and strengthening of a building in a universit y hospital,the application of the approach of prestressed multi-ribbed cast-in -site floor slab with welded steel bar web is expounded,and the technique for c onnecting new foundation with the old is also presented. Several advices on desi gn of prestressed concrete are also suggested.
Based on an example of renovation and strengthening of a building in a universit y hospital,the application of the approach of prestressed multi-ribbed cast-in -site floor slab with welded steel bar web is expounded,and the technique for c onnecting new foundation with the old is also presented. Several advices on desi gn of prestressed concrete are also suggested.
2004, 34(12): 89-90.
doi: 10.13204/j.gyjz200412027
Abstract:
The 33.6 meter-length prestressed concrete curved girder is applied in scene f rame of Dongli Park in Harbin.The following problems of this curved girder are a nalyzed:how to determine the material of the curved girder,the profile of prestr essing tendons;how to calculate external loads and internal forces;how to comput e areas of pretressing tendons and non-prestressing steel;how to control the cr ack and deflection of the girder.It may bea reference for design and constructio n of similar projects.
The 33.6 meter-length prestressed concrete curved girder is applied in scene f rame of Dongli Park in Harbin.The following problems of this curved girder are a nalyzed:how to determine the material of the curved girder,the profile of prestr essing tendons;how to calculate external loads and internal forces;how to comput e areas of pretressing tendons and non-prestressing steel;how to control the cr ack and deflection of the girder.It may bea reference for design and constructio n of similar projects.
2004, 34(12): 91-95.
doi: 10.13204/j.gyjz200412028
Abstract:
Hengliong Plaza is 66 storeys made of pure reinforced concrete, 288m high, the tallest building in the world.This paper attempts to summarize the experience re lated to the design and construction,and the theory of superstructure-foundatio n interaction is used to analyze the settlement,the load distribution on pile gr oup and the stress in bottom slab of box foundation.The calculated values of set tlement is in reasonable agreement with the measured ones.
Hengliong Plaza is 66 storeys made of pure reinforced concrete, 288m high, the tallest building in the world.This paper attempts to summarize the experience re lated to the design and construction,and the theory of superstructure-foundatio n interaction is used to analyze the settlement,the load distribution on pile gr oup and the stress in bottom slab of box foundation.The calculated values of set tlement is in reasonable agreement with the measured ones.
2004, 34(12): 96-97.
doi: 10.13204/j.gyjz200412029
Abstract:
Based on a practical project, it is analysed that the disadvantageous factors of the heaped load brought by slope land making on soft soil ground to a base des ign, and some ways to solve the problem are also introduced.
Based on a practical project, it is analysed that the disadvantageous factors of the heaped load brought by slope land making on soft soil ground to a base des ign, and some ways to solve the problem are also introduced.
2004, 34(12): 98-99.
doi: 10.13204/j.gyjz200412030
Abstract:
More and more people are attracting by landscape,yet a landscape design is seem ingly considered as a kind of artistic design.This paper attempts to explain th rough theoretical analysis that the landscape design is a comprehensive subject of integrating art with technology,which shows further that both artistic qualit y and technical problem should be considered in a landscape design.
More and more people are attracting by landscape,yet a landscape design is seem ingly considered as a kind of artistic design.This paper attempts to explain th rough theoretical analysis that the landscape design is a comprehensive subject of integrating art with technology,which shows further that both artistic qualit y and technical problem should be considered in a landscape design.
