腐蚀与荷载耦合作用下钢-混凝土组合梁长期变形研究  

Long-term deformation of steel-concrete composite beams subjected to coupling effect of corrosion and loading

作　　者：曹国辉[1] 廖世杰 彭鹏 肖勇刚[2] Cao Guohui;Liao Shijie;Peng Peng;Xiao Yonggong(Hunan City Universily,Yiyang 413000,China;Changha University of Science&Technology,Changsha 410114,China;Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湖南城市学院,湖南益阳413000 [2]长沙理工大学,湖南长沙410114 [3]湘潭大学,湖南湘潭411105

出　　处：《土木工程学报》2022年第1期32-40,88,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(51551801)。

摘　　要：为探究腐蚀与荷载耦合作用下钢-混凝土组合梁长期变形规律,对钢-混凝土组合梁进行腐蚀与荷载耦合作用225d的长期性能试验,考虑不同加载龄期、栓钉锈蚀率对钢-混凝土组合梁界面相对滑移和长期挠度的影响。研究结果表明:在腐蚀与荷载耦合作用下,栓钉锈蚀率越高,组合梁的界面相对滑移及长期挠度也越大;长期挠度增长与混凝土徐变发展规律类似,与混凝土加载龄期7d的组合梁相比,混凝土加载龄期28d的组合梁长期挠度较小;基于龄期调整的有效模量法和应力重分布原理,考虑组合梁由混凝土收缩徐变和栓钉锈蚀引起的附加挠度,提出栓钉锈蚀条件下组合梁的长期挠度计算公式;组合梁长期挠度理论计算值与实测值吻合较好,可为工程实际运用提供参考。To study the long-term deformation rule of steel-concrete composite beams under the coupling effects of corrosion and loading,taking corrosion rate of studs and loading age as variables,a long-term peHormance experiment over 225 clays was carried out on steel-concrete composite beams.The result shows that,under the coupled effect of corrosion and load,both long-term relative slip of interface and dellection increases with the corrosion rate of studs.The increased rule of long-term defleclion law is similar to that for creep of concrete.The long-term deflection of composite beams with a loading period of 28 days is smaller than that of 7 days.Based on the age-adjusted effective modulus method and the principle of stress redistribution,considering the additional deflection caused by the shrinkage and creep of concrete and the corrosion of studs,a long-term deflection calculating formula for corrosion of studs is proposed for steel-concrete composite beams.The theoretical value of long-term deflection of the composite beam has good agreement with the measured value,which indicates that the formula can provide reference for the practical application of engineering.

关 键 词：腐蚀与荷载耦合作用 栓钉锈蚀 收缩徐变 相对滑移 有效模量法 应力重分布 

分 类 号：TU398.9[建筑科学—结构工程]