锈蚀钢筋混凝土梁受弯承载力计算模型  

Flexural capacity of corrosion-damaged RC beams

作　　者：金伟良[1] 夏晋[1] 蒋遨宇[1] 王海龙[1] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058

出　　处：《土木工程学报》2009年第11期64-70,共7页China Civil Engineering Journal

基　　金：国家自然科学基金资助项目(No.50538070);国家863计划项目(No.2006AA04Z422);国家西部交通建设科技项目(No.200631800019);浙江省科技重点计划项目(No.2006C13090)

摘　　要：给出锈蚀钢筋混凝土梁受弯承载力的计算模型,模型综合考虑锈蚀钢筋混凝土梁中材料性能的退化和钢筋与混凝土黏结性能的退化,根据梁截面平衡方程和钢筋与混凝土的变形协调方程建立梁中受拉钢筋轴力微分方程,给出了微分方程的滑移边界条件和钢筋轴力连续边界条件,定义梁弯曲破坏的两种极限状态:混凝土压碎和钢筋屈服。通过国内外试验数据,对本模型进行验证,模型计算结果与试验结果吻合很好。最后,将受拉纵筋直径、受拉纵筋屈服强度、保护层厚度和混凝土受压强度四种参数对梁受弯承载力的影响进行分析。Considering degradation of the rebar, concrete and bond between the rebar and concrete of corrosion-damaged RC beams, the differential equation for the axial force of the longitudinal bar was established according to the equilibrium of beam section and the deformation compatibility of the rebar and concrete. The bond-slip boundary condition and the rebar axial force continuity boundary condition were formulated. Two types of limit states of bending failure, including both concrete crush and rebar yield, were defined. The model was verified by experimental data from both China and abroad. The influences of the diameter and yield strength of the longitudinal rebar, the thickness of concrete cover and the concrete compression strength on the flexural capacity of RC beams were analyzed.

关 键 词：钢筋混凝土梁 锈蚀 受弯承载力 模型 

分 类 号：TU375.1[建筑科学—结构工程]