不同构造复式钢管混凝土足尺柱抗震性能试验  

Experimental study on the seismic behavior of large-scale double-skin concrete-filled steel tube columns with different constructions

作　　者：赵立东[1] 曹万林[1] 阚文亮 陈泽巧 陈钱佳 ZHAO Lidong;CAO Wanlin;KAN Wenliang;CHEN Zeqiao;CHEN Qianjia(Key Lab of Urban Security and Disaster Engineering(Beijing University of Technology),Ministry of Education,Beijing 100124,China)

机构地区：[1]城市与工程安全减灾教育部重点实验室(北京工业大学)

出　　处：《哈尔滨工业大学学报》2019年第12期35-45,共11页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51878015)

摘　　要：为研究复式钢管混凝土柱的抗震性能,完成了3种截面形式、2种剪跨比共6个试件的低周反复荷载试验,各试件施加相同轴力.截面钢构形式分别为圆钢管、外圆内圆复式钢管和带分腔焊接钢板的复式钢管.分析了各试件的破坏形态、滞回特性、承载力、刚度退化、延性和耗能.试验结果表明:除剪跨比2.2且未设置腔体构造的钢管混凝土柱外,其余试件滞回曲线饱满,抗震性能稳定;增加截面含钢率或提高剪跨比,可使试件在达到相同位移角时的滞回曲线更加饱满;设置内圆钢管和分腔焊接钢板可提高构件承载力,对较小剪跨比试件的延性改善显著;降低剪跨比可显著提高构件初始刚度,但刚度退化速度较快,累积损伤效应更加显著;各试件在达到极限位移角时,设置腔体构造的剪跨比较小试件的累积耗能更高;与试验结果进行对比,本文采用的钢管混凝土柱实用承载力计算方法结果偏于保守.To investigate the seismic performance of double-skin concrete-filled steel tubular(CFST)columns,a quasi-static test was conducted for 6 specimens with 3 section forms and 2 shear span ratios,and the same vertical load was applied to each specimen.The steel components of the specimens were set as circular steel tube,double-skin steel tube,and double-skin steel tube with cavity welded steel plate.Failure mode,hysteresis characteristics,bearing capacity,stiffness degradation,ductility,and energy consumption of the specimens were analyzed.Test results indicate that except for the single-cavity CFST column with shear span ratio of 2.2,the hysteretic curves of the other specimens are plump and the seismic performance is stable.The hysteretic curves of the specimens with the same drift ratio can be plumper by increasing the section steel ratio or the shear span ratio.Setting the inner steel tube and the cavity welded steel plate can improve the bearing capacity,and it can greatly enhance the ductility of the specimens with smaller shear span ratio.The initial stiffness can be significantly improved by reducing the shear span ratio,but the stiffness degradation rate is faster,and the cumulative damage effect is more significant.When the construction is set,the cumulative energy dissipation of the specimens with small shear span ratio is higher when the ultimate drift ratio is reached.Compared with the experimental results,the calculation results of the practical bearing capacity of the CFST column adopted in this study are conservative.

关 键 词：复式钢管混凝土柱 分腔焊接钢板 低周反复荷载试验 抗震性能 剪跨比 截面含钢率 

分 类 号：TU375[建筑科学—结构工程]