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STRESS OF REINFORCEMENT IN REINFORCED CONCRETE FLEXURAL MEMBERS WITH CONTROLLED CRACK WIDTH
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摘要: 在分析规范中裂缝宽度计算公式所考虑的影响因素后,通过推导钢筋混凝土受弯构件以限制钢筋应力来实现裂缝宽度控制的方程,结合裂缝宽度限值和影响因素典型取值,得到钢筋应力限值的简化计算公式。只要钢筋应力限值达到要求即可实现裂缝宽度控制,可避免对荷载作用下裂缝宽度的验算。最后比较分析了各种规范的计算结果。Abstract: After the influencing factors on crack width in reinforced concrete members are analyzed, the formulas to calculate the limited stress of reinforcement to control the crack width are derived, and the succinct formulas of computing allowable stress of reinforcement are put forward by considering the maximum crack width and typical values of influencing factors, also the charts can be made. The control of crack width will be achieved if the stress is less than the allowable value, thus avoid calculating the crack width under service load. An example is used to compare and analysis theoretical results obtained from various codes.
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[2] GB 50010-2002 混凝土结构设计规范 江见鲸. 混凝土结构工程学. 北京: 中国建筑工业出版社, 1998:237-255 [3] JTG D62-2004 公路钢筋混凝土和预应力混凝土桥涵设计规范 [4] TB 10002. 3-2005 铁路桥涵钢筋混凝土和预应力混凝土结构设计规范 [5] ACI Committ ee 318. Building Code Requirements for Reinf orcedConcrete (ACI318-02) and Commentary (ACI318R-02). American Concrete Institute, Farmingt on Hills., Mich., 2002 [6] AASHTO LRFD Bridge Design Specificat ion (2nd Edition ). American Association of State Highway and Transportation Off icials. Washington D. C., 1998 [7] Gergely P, d Lut z L A. Maximum Crack Width in Reinforced Concrete Flexural Members. see Gergely P, d Lut z L A. Causes, Mechanism, and Control of Cracking in Concrete, SP-20. Detroit: American Concrete Institute, 1968: 87-117 [8] Frosch R J. Another Look at Cracking and Crack Cont rol in Reinforced Concrete. ACI Structural Journal, 1999, 96(3) : 437-442 [9] Darwin D, et. al. Debat e: Crack Width, Cover, and Corrosion.Concrete International, 1985, 8(5) : 20-35 -
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