锈蚀钢混梁的受弯挠度和裂缝计算  

Deflection and crack calculation of corroded reinforced concrete beams

作　　者：陈驹[1] 邢锋[2] 赵羽习[1] 金伟良[1] 

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]深圳大学土木学院,深圳518060

出　　处：《深圳大学学报（理工版）》2010年第4期447-451,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：深圳市土木工程重点实验室资助项目(SZDCCE09-13)~~

摘　　要：提出钢筋混凝土梁的非线性理论计算模型,考虑钢筋与混凝土之间的黏结滑移和对混凝土裂缝的影响,编制了相应的计算程序.计算不同年限的锈蚀钢筋混凝土受弯荷载下的裂缝和挠度,分析混凝土性能衰退、锈蚀钢筋力学性能以及锈蚀黏结滑移本构对裂缝和挠度的影响.结果表明,混凝土性能衰退对挠度和裂缝宽度的影响不大,锈蚀钢筋力学性能和锈蚀黏结滑移本构对挠度和裂缝宽度的影响较大.当钢筋锈蚀率大于1.5%,梁的挠度和裂缝宽度均随着锈蚀率的提高而增大.引入锈蚀黏结滑移本构影响参数,提出经修正的挠度和裂缝宽度计算公式,修正后的公式计算结果与数值解符合较好.A non-linear model of reinforced concrete beams was developed for calculating the deflection and crack of corroded reinforced concrete beams.The effects of initial crack and bond-slip behavior between rebar and concrete were considered in the model.The effects of corrosion in reduction of rebar cross section area and bond-slip behavior on the deflection and crack of corroded reinforced concrete beams were analyzed.The concrete deterioration has less effect on the deflection and crack,and it has significant influence on corroded rebar material properties and bond-slip constitutive relation.The deflection and crack increases as the increase of rebar corrosion rates when the rebar corrosion rate exceeds 1.5%.A modified design equation which considers the bond-slip behavior between corroded rebar and concrete is proposed.

关 键 词：工程力学 钢筋混凝土耐久性 锈蚀 钢筋混凝土梁 黏结滑移 

分 类 号：TU375[建筑科学—结构工程]