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	钢管混凝土柱在纯扭和压扭荷载下的抗震性能研究
	聂建国 ; 王宇航 ; 樊健生 ; Nie Jianguo ; Wang Yuhang ; Fan Jiansheng
	2016-03-30 ; 2016-03-30
关键词	钢管混凝土柱 纯扭 压扭 复合作用 拟静力 concrete filled steel tube column pure torsion compression-torsion combined action quasi-static test TU398.9 TU352.11
其他题名	Study on seismic behavior of concrete filled steel tube columns under pure torsion and compression-torsion combined action
中文摘要	为研究钢管混凝土的抗扭性能,完成8个钢管混凝土柱试件在纯扭和压扭荷载下的拟静力试验,变化截面形式、含钢率和轴力大小等参数。试验结果表明:钢管混凝土柱在往复扭矩荷载作用下的滞回曲线非常饱满,没有"捏拢"现象产生,卸载刚度几乎等于初始弹性刚度,试件的强度和刚度的损伤退化程度较低,具有较好的耗能能力。轴力较小时,轴力对钢管混凝土柱的抗扭承载力有提高作用,且延性较好;但轴力较大时,轴力将削弱钢管混凝土柱的抗扭承载力。在纯扭荷载作用下,钢管内的混凝土由于斜向开裂形成螺旋斜压杆,斜向压力的轴向分量由钢管的轴向拉力平衡,导致钢管存在拉应变。在纯扭和压扭荷载作用下,钢管剪应变与扭转角之间存在较好的线性关系。基于试验结果和已有文献研究成果,较为全面地分析钢管混凝土的抗扭机理,为进一步开发可考虑扭转作用的钢管混凝土杆系单元提供研究基础。; Based on the quasi-static test on eight CFST columns subjected to pure torsion and compression-torsion combined action,the torsion behavior of CFST columns with various section types,steel ratios and axial load was studied. The test results show that the hysteresis curves of CFST columns under pure torsion and low compression-torsion are very plump. The unloading stiffness of CFST columns was equal to the initial elastic stiffness. The torsional capacity of CFST columns could be improved by the low compression load,and the ductility was also good,but the torsional capacity of CFST columns could be reduced by the high compression load. When CFST columns were subjected to pure torsion,spiral diagonal compression struts would be created in the infilled concrete,and the diagonal compression force was equal to the axial tension force of the steel tube in order to satisfy the axial load equilibrium condition on the section, so the axial strain may be produced in the steel tube. The shear strain has a good linear relationship with the rotation angle of the section when CFST columns are subjected to pure torsion and compression-torsion combined action. Based on the test results and literatures available,the torsion mechanism of CFST columns was analyzed in detail,laying a foundation for the development of member system element of CFST columns with torsion effect considered.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://ir.lib.tsinghua.edu.cn/ir/item.do?handle=123456789/141874]
专题	清华大学
推荐引用方式 GB/T 7714	聂建国,王宇航,樊健生,等. 钢管混凝土柱在纯扭和压扭荷载下的抗震性能研究[J],2016, 2016.
APA	聂建国,王宇航,樊健生,Nie Jianguo,Wang Yuhang,&Fan Jiansheng.(2016).钢管混凝土柱在纯扭和压扭荷载下的抗震性能研究..
MLA	聂建国,et al."钢管混凝土柱在纯扭和压扭荷载下的抗震性能研究".(2016).

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