复合钢管高强混凝土柱累积损伤性能试验研究

发布时间：2018-06-17 02:00

本文选题：复合钢管高强混凝土柱 + 累积损伤　；参考：《土木工程学报》2014年02期

【摘要】：为研究外方内圆复合钢管高强混凝土柱的累积损伤性能,完成6个试件在轴压力作用下、同一水平位移往复加载10次的拟静力试验。试验主要变化参数为轴压比,方钢管壁板厚度及其宽厚比,圆钢管直径及厚度。试件的破坏形态基本相同,为柱底约300mm高度范围内方钢管外鼓屈曲,方、圆钢管之间混凝土局部压碎,圆钢管底部外鼓。破坏程度比往复加载3次的试件略为严重。试件的水平力-位移滞回曲线饱满;名义屈服时,试件的位移角为1/154~1/124;达到最大水平力时,试件的位移角大于1/80;试件的极限位移角大于1/60。与往复加载3次的复合柱试件的抗震性能基本相同,复合柱的抗震性能稳定。水平位移角为1/150及1/100时,试件基本无累积损伤;水平位移角为1/75、1/50及1/33时,试件有累积损伤,但不严重。增大方钢管壁厚或圆钢管壁厚,可以减小同一位移多次往复加载累积损伤引起的试件承载能力退化的幅度。
[Abstract]:In order to study the cumulative damage behavior of high strength concrete filled steel tube columns with outer square inner circle composite steel tubes, pseudostatic tests of 6 specimens subjected to reciprocating loading of the same horizontal displacement under axial pressure were carried out for 10 times. The main parameters of the test are axial compression ratio, thickness of square steel tube wall and its ratio of width to thickness, diameter and thickness of circular steel tube. The failure patterns of the specimens are basically the same, including the buckling of the square steel tube in the 300mm height range, the local crushing of concrete between the square and circular steel tubes, and the outer drum at the bottom of the circular steel tube. The damage degree is a little more serious than that of the specimen subjected to three times of reciprocating loading. The horizontal force-displacement hysteretic curve of the specimen is full, the displacement angle of the specimen is 1 / 154 / 124 when the specimen is nominal yielding, the displacement angle of the specimen is more than 1 / 80 when the maximum horizontal force is reached, and the limit displacement angle of the specimen is greater than 1 / 60. The seismic behavior of the composite column is basically the same as that of the composite column subjected to reciprocating loading for 3 times, and the seismic performance of the composite column is stable. When the horizontal displacement angle is 1 / 150 and 1 / 100, the specimen has no cumulative damage, and when the horizontal displacement angle is 1 / 75 / 50 and 1 / 33, the specimen has cumulative damage, but it is not serious. Increasing the wall thickness of square steel tube or circular steel tube can reduce the amplitude of load capacity degradation caused by cumulative damage caused by repeated reciprocating loading of the same displacement.
【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;北京工业大学;
【基金】：国家自然科学基金国际(地区)合作与交流项目(51261120377) 北京市科技计划重点项目(D09050600370000)
【分类号】：TU398.9;TU317

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