基于粘结强度变化的锈蚀无腹筋梁承载能力的研究  

Research on load carrying capacity of corroded RC beam without web reinforcement on the basis of the change of bond strength

作　　者：王小惠[1] 刘西拉[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《四川建筑科学研究》2007年第3期56-61,70,共7页Sichuan Building Science

基　　金：国家自然科学基金项目(50508020);国家重点基础研究发展规划项目(2002CB412709)

摘　　要：基于锈蚀钢筋混凝土梁内钢筋与混凝土间粘结强度随锈蚀量的变化,对锈蚀梁承载能力和破坏模式进行了研究。首先,基于梁内粘结强度的变化,计算锈蚀梁的抗弯承载力。其次,基于“拉、剪临界破坏”的概念和“梁—拱”共同作用的混凝土抗剪抵抗机制,计算锈蚀无腹筋梁的抗剪承载力。较小钢筋锈蚀量时,与粘结强度有关的“梁作用”因粘结强度的增加而增加;随锈蚀量的增加和粘结强度的退化,与粘结强度有关的“梁作用”不断降低,“拱作用”则有所增加。再次,对锈蚀梁随钢筋锈蚀量变化破坏模式的变化进行了分析。最后,对文中提出的模型进行了试验验证。Load carrying capacity and failure mode of corroded reinforced concrete （RC） beams is modeled and calculated on the basis of the change of bend strength between corroded steel and concrete. Firstly ,basing on the change of bend strength,flexural carrying capacity of corroded RC beams is calculated. Secondly, on the basis of the concept of the critical tensile-shear failure stress state of plain concrete and the combined shear resistance of beam action and arch action, shear carrying capacity of corroded RC beams without web reinforcement （here the web reinforcement is mainly stirrup） is firstly proposed. At lower degrees of corrosion level,＂ beam action＂ which is associated with bond strength of the beam increases with increasing degrees of corrosion; with the further increasing degrees of corrosion and reduction of bend strength, ＂beam action＂ contribution to shear strength decreases and ＂ arch action＂ contribution to shear strength increases. Thirdly, the change of the failure mode of the corroded RC beam with the change of bend strength is analyzed. Finally,the proposed models are compared with the corresponding test results. Comparison between the calculated results and test results shows it is very satisfactory.

关 键 词：锈蚀钢筋混凝土梁 粘结强度 抗弯承载力 抗剪承载力 破坏模式 

分 类 号：TU375.02[建筑科学—结构工程]