钢-混凝土组合梁在疲劳荷载作用下的变形计算  

Deflection of a composite steel-concrete beam subjected to a fatigue load

作　　者：聂建国[1] 王宇航[1] 

机构地区：[1]清华大学土木工程系,结构工程与振动教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2009年第12期1915-1918,1924,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50578084)

摘　　要：为合理地设计钢-混凝土组合梁,计算了在疲劳荷载作用下的变形。该模型基于钢-混凝土界面的残余滑移微分方程,考虑了组合梁截面刚度、栓钉受力性能、荷载幅(荷载上限与荷载下限的差)、荷载比(荷载上限与荷载下限的比值)等因素,推导了变形计算公式。计算结果与实测结果相比的误差在10%以内。结果表明:增大截面刚度有助于减小疲劳荷载的削弱影响,荷载比不宜超过4,栓钉的静力抗剪承载力不应低于荷载上限的2倍。该方法可供实际设计参考。A method was developed to calculate the deflection of the composite steel-concrete beams subjected to fatigue loads based on the residual slip differential equation at the interface between the steel and concrete for improved design of composite beams.The deflection was given as a function of the composite beam section rigidity,the stud mechanical behavior,the load amplitude（Pmax-Pmin）,and the load ratio（Pmax/Pmin）. The equation represents experimental data with a maximum error less than 10%.The results show that large section rigidity improves the stiffness of composite beam subjected to fatigue loads,that the load ratio should not be greater than 4,and the stud static strength should be larger than twice the peak load.Thus,the method is suitable for engineering design.

关 键 词：钢-混凝土组合梁 疲劳荷载 变形 

分 类 号：TU398.9[建筑科学—结构工程]