实腹式型钢混凝土十字形截面柱抗震性能拟静力及混合试验研究  

Seismic quasi-static test and hybrid test on +-shaped section solid-web steel reinforced concrete columns

作　　者：蔡新江[1,2] 巩牧华 贾红星[3] 田石柱[1,2] 

机构地区：[1]苏州科技大学土木工程学院,江苏苏州215011 [2]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011 [3]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》2016年第5期146-154,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51308368;51278322)

摘　　要：为研究实腹式型钢混凝土十字形截面柱的抗震性能,以1榀3层2跨异形柱中框架为原型,通过拟静力试验预先获得不同轴压比下对比柱的基本受力性能。构建了Open Sees-Open Fresco-MTS抗震混合试验系统,取底层十字形截面中柱作为试验单元,并利用四连杆设备进行加载,其余部分作为计算单元,基于Open Sees软件进行模拟,将模拟结果作为目标位移进行加载,观察各试件的受力过程及破坏特征,获得了试件的滞回曲线和骨架曲线,对比分析了承载力、延性、耗能及刚度退化等。研究结果表明:随着轴压比的增大,各试件的力学特征值均降低,但弹性刚度不变;与拟静力试验中各对比试件相比,地震作用的随机性对混合试验中各构件的抗震性能影响较大,导致其某一方向承载力和刚度大大降低;历经混合试验的震后损伤试件仍然具有对比试件75%的承载能力。In order to investigate the seismic behaviors of specially shaped solid-web steel reinforced concrete columns with cruciform section,a two-bay and three-story interior frame was studied. Two contrastive column specimens with various axial compression ratios were tested by quasi-static test to obtain the basic mechanical performance. The seismic hybrid test system named Open Sees-Open Fresco-MTS was developed. The interior column at the bottom story was loaded with four-bar device and the rest of the structure was numerically simulated with Open Sees. The displacement calculated by the FE analysis was imposed on the specimen. Then the hysteretic curves and skeleton curves of different specimens were obtained by observing the loading process and failure characteristics,and further analysis of bearing capacity,ductility,energy dissipation and stiffness degradation. The results show that all the mechanical characteristics values are decreased with the increase of axial compression ratio,but the elastic stiffness is almost unchanged. Compared with specimens in quasi-static test,the randomness of earthquake seriously affects the seismic performance of specimens in hybrid test,which causes the performance degradation of bearing capacity and stiffness of a certain load direction. The damaged specimens subjected to seismic hybrid tests still have 75% of the bearing capacity and ductility of the contrast specimen.

关 键 词：异形柱框架 型钢混凝土 实腹式 混合试验 拟静力试验 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1