冷弯薄壁型钢梁的滞回性能研究  

Study on the hysteretic behavior of cold-formed thin-walled steel tube beams subjected to low-cycle reversed loading

作　　者：谢兆平[1] 宗周红[2] 林晓东[1] 

机构地区：[1]莆田学院土木建筑工程系,福建莆田351100 [2]福州大学土木工程学院,福建福州350108

出　　处：《河北工程大学学报（自然科学版）》2009年第3期26-30,共5页Journal of Hebei University of Engineering:Natural Science Edition

摘　　要：进行了八片方形冷弯薄壁型钢梁在反复荷载作用下的试验研究和非线性有限元分析,研究不同跨高比和截面宽厚比对冷弯薄壁型钢梁的滞回性能、延性和耗能能力等的影响。结果表明:冷弯薄壁型钢梁的荷载-位移滞回曲线比较饱满,没有明显的捏缩现象,具有很好的延性和耗能能力;跨高比和宽厚比会严重影响冷弯薄壁型钢梁的滞回性能和延性。建立的非线性有限元模型能够预测冷弯薄壁型钢梁的弹塑性行为和抗震性能,计算结果与实测结果基本吻合。In this paper, 8 pieces of cold - formed thin - walled steel tube beams subjected to low - cycle reversed loading were tested, and nonlinear finite element analysis were also conducted to explore the effects of span to height ratios and width to thickness ratios of cross - section on the hysteretic behavior, ductility, and the ability of energy dissipation. Some important conclusions can be extracted from the experiments and the nonlinear analysis and listed as follows： （1）The cold- formed thin- walled steel tube beams exhibited stable hysteresis behavior up to local buckling and then showed considerable good ductility and the good ability of energy dissipation. The pinch - crinkle phenomena didn＇ t occur in the hysteresis loops of load - displacement. （2） The hysteresis behavior and ductility of cold - formed thin - walled steel tube beams depended on the span to height ratios and width to thickness ratios. （3） The proposed nonlinear FE model could accurately predict the overall seismic behavior and the inelastic performance of the cold - formed thin- walled steel tube beams. The hysteresis loops from nonlinear FE models tmder low - cycle reversed leading agreed well with those from the low- cyclic reversed loading tests.

关 键 词：冷弯薄壁型钢梁 非线性有限元分析 滞回性能 试验研究 反复荷载作用 

分 类 号：TU328[建筑科学—结构工程]