火灾后钢筋混凝土梁抗剪承载力  

Shear capacity of fire-damaged reinforced concrete beams

作　　者：王国辉[1] 项凯[1] 李慧[1] 毛星[1] 

机构地区：[1]公安部天津消防研究所,天津300381

出　　处：《消防科学与技术》2012年第6期558-561,共4页Fire Science and Technology

基　　金：公安部应用创新资助项目"火灾后混凝土连续梁的力学性能与加固修复"(2010YYCXTJXF135)

摘　　要：研究火灾后钢筋混凝土梁抗剪承载力,建立了钢筋混凝土梁的非线性有限元模型,对其在火灾后的抗剪性能进行了数值模拟。有限元模型考虑了火灾作用后混凝土和钢筋的材料损伤,分析了火灾时间、剪跨比、混凝土强度、箍筋直径和箍筋间距对钢筋混凝土梁抗剪承载力和刚度的影响程度。结果表明,随着火灾时间的增加、剪跨比的增大或混凝土强度的下降,火灾后钢筋混凝土梁的抗剪承载力和刚度均明显下降。随着箍筋直径的下降或箍筋间距的增大,火灾后钢筋混凝土梁的抗剪承载力下降,而刚度变化较小。In order to research the shear capacity of fire-damaged reinforced concrete （RC） beams, the nonlinear finite element model was developed. Considering mechanical properties de- scending of concrete and steel reinforcing bar, the parameters of fire-damaged RC beam, including fire time, shear span to depth ratios, concrete strength, stirrup diameters and stirrup spac- ing, were analyzed. Based on numerical analysis, the change of shear capacity and rigidity of fire-- damaged RC beam were i-dentified. The results showed that with fire time increase or shear span to depth ratio increase or concrete strength decrease, shear capacity and rigidity of fire-damaged RC beam declined obviously. With stirrup diameters decrease or stirrup spacing increase, shear capacity of fire-damaged RC beam declined, but rigidity of fire-damaged RC beam had little change.

关 键 词：火灾 钢筋混凝土梁 抗剪 有限元法 

分 类 号：X913.4[环境科学与工程—安全科学] TU312.3[建筑科学—结构工程]