钢管混凝土柱轴压力-弯矩-扭矩空间复合受力拟静力试验研究  被引量:29

Experimental study on concrete filled steel tubular columns under combined compression,flexure and torsion

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作  者:聂建国[1] 王宇航[1] 樊健生[1] 

机构地区:[1]清华大学土木工程系,北京100084

出  处:《建筑结构学报》2012年第9期1-11,共11页Journal of Building Structures

基  金:国家自然科学基金项目(51078206);清华大学自主科研计划项目(20101081766)

摘  要:采用自行设计的压力-弯矩-扭矩复合受力加载装置,基于力-位移混合控制加载方法,完成了8个钢管混凝土柱试件在压-弯-扭等复合荷载作用下的拟静力试验,变化了截面形式、加载方式和弯扭比等参数。试验结果表明:圆钢管混凝土柱和矩形钢管混凝土柱在压-弯-扭等复合受力往复荷载作用下的滞回曲线较为饱满,没有"捏拢"现象产生,具有较好的耗能能力;弯扭比较大的矩形钢管混凝土试件在扭转角较大时由于钢管底部局部屈曲较为明显,存在承载力退化现象;钢管混凝土截面轴向应变基本满足平截面假定;弯矩的存在将削弱钢管混凝土柱的受扭能力;在压-弯-扭等复合受力往复荷载作用下,钢管剪应变与扭转角之间存在较好的线性关系。对试验实测结果和已有文献分析表明:在弯扭比较大时由主压应力导致钢管表面发生局部鼓曲而破坏,弯扭比较小时,主拉应变将导致钢管混凝土柱表面在低周往复荷载作用下开裂。研究成果可为进一步开发考虑扭转作用的钢管混凝土纤维梁单元提供基础性依据。Based on the mixed control quasi-static test on eight CFST columns subjected to combined compression, flexure and torsion, the mechanical behavior of CFST columns with various section types, bending moment-torsional moment ratios and axial load was studied. The test results show that the hysteretic curves of CFST columns under combined compression, flexure and torsion are plump due to the good seismic behavior and the ductility is also good. But for rectangular CFST columns with high bending moment-torsional moment ratios, the strength degradation can be observed due to the local buckling of the steel plate at the bottom. The torsion capacity of CFST columns can be reduced by the bending moment. The plane section assumption of axial strain of CFST columns can be satisfied. The shear strain has good linear relationship with the rotation angle of the section when CFST columns are subjected to combined compression, flexure and torsion. Based on the test results and literatures available, the mechanism of CFST columns is analyzed in details. The research foundation is established for the development of beam-column element of CFST columns considering torsional effects.

关 键 词:钢管混凝土柱 压力-弯矩-扭矩 复合作用 力和位移混合控制 拟静力试验 力学性能 

分 类 号:TU398.9[建筑科学—结构工程] TU317.1

 

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