低周往复荷载下楔形H形钢短梁滞回性能Ⅰ:试验研究  

Hysteresis of tapered H-section steel short beam with thin web under cyclic loadⅠ:experiment

作　　者：杨娜[1] 焦通[1] 陈爱国[1] 

机构地区：[1]北京交通大学,北京100044

出　　处：《土木工程学报》2009年第8期57-62,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(50778019)

摘　　要：通过对7个楔形薄腹H形钢短梁进行循环荷载试验,研究楔形薄壁H形钢短梁在横向荷载作用下的破坏形态与滞回性能。通过改变腹板宽厚比、翼缘宽厚比、楔率等参数研究楔形薄腹H形钢短梁在低周往复荷载作用下的各项性能。根据试验获得的楔形薄腹H形钢短梁的破坏形态和滞回曲线,分析试件在反复水平荷载作用下的局部屈曲产生与发展机理,绘制试验试件骨架曲线,对比分析腹板宽厚比、翼缘宽厚比、楔率等参数对骨架曲线的影响。结果表明,局部屈曲是短钢梁试件最终破坏的主要原因之一;腹板与翼缘宽厚比越大,构件的耗能性能越差;腹板宽厚比和楔率对构件的刚度退化影响不大。Commonly used steel portal frames with thin web tapered earthquake loading. In order to investigate the seismic performance beams of various dimensions are constructed and tested under low beams often suffer local buckling under static loading and of H-section tapered beams, seven H-section steel short cyclic reversed loading. Three parameters, web width- thickness ratio, flange width-thickness ratio and web width-tapering ratio are taken into consideration. Based on the hysteretic curves as well as stiffness degradati the main failure modes, the influences of the three parameters on local buckling patterns, energy dissipation, on, are discussed. The load-displacement skeleton curves, the local buckling and the damage phenomena of the specimens are analyzed. It is shown that local buckling is the main cause for the failure of the H-section tapered beams The capacity of energy dissipation decreases with increase in the width-thickness ratio of the web and the flange, while the influence of the width-thickness ratio and taper ratio of the web on the stiffness degradation is limited.

关 键 词：楔形H形钢梁 拟静力试验 局部屈曲 滞回曲线 

分 类 号：TU392.1[建筑科学—结构工程]