双向压弯方钢管高强混凝土构件滞回性能试验与分析  

Hysteretic behavior of biaxially loaded high strength concrete-filled square hollow section beam-columns

作　　者：张素梅[1] 刘界鹏[1] 王玉银[1] 郭兰慧[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2005年第3期9-18,共10页Journal of Building Structures

基　　金：国家自然科学基金资助项目(59808004);黑龙江省杰出青年基金资助项目

摘　　要：进行了4个双向压弯方钢管高强混凝土构件在低周反复荷载作用下的试验研究。试验中的主要参数为轴压比(0.433～0.624)、宽厚比(30和50)和长细比(18.5和25.4)。试验结果表明,随轴压比的提高,构件的承载力和延性降低,随钢管宽厚比的增加,构件的承载力提高;试件的位移延性系数μ=3.63～5.18,抗震性能良好。利用纤维模型法计算了构件的荷载位移滞回曲线,计算结果与试验结果吻合较好。进行了压弯构件的截面参数分析,研究了轴压比、套箍系数、加载角度和荷载类型对构件滞回性能的影响。建立了方钢管混凝土压弯构件的弯矩曲率和荷载位移恢复力模型,基于恢复力模型的计算结果与试验结果吻合较好,可为结构的弹塑性动力分析提供参考。This paper presents a low cycle test on 4 high strength concrete-filled square hollow section (SHS) beam-columns under axial load and biaxial bending moment. The parameters in the study include axial compression ratio (0.433~0.624), width-to-thickness ratio (30 and 50) and slenderness ratio (18.5 and 25.4). The experimental results showed that the specimens have better hysteretic properties and ductility (μ = 3.63~5.18). The bearing capacity and ductility of the specimens decrease with the increase of axial compression ratio; and the bearing capacity increases as the width-to-thickness ratio increases. Fiber-based model is employed to calculate the load-deformation hysteresis curves of specimens and the corresponding results agree well with the experimental results. The cross-sectional parameters of such member are analyzed, and the effects of confinement index, axial compression ratio, load angle and load type on the behavior of the specimens are investigated in details with fiber-based model. Simplified models for the moment-curvature response and load-restoring force are suggested. Results from the suggested models show good agreement with the experimental results, and the models can be applied to elastoplastic dynamic analysis of structures.

关 键 词：高强混凝土 纤维模型 加载角度 双向压弯方钢管 混凝土构件 滞回性能 性能试验 

分 类 号：TU378[建筑科学—结构工程] TU317