轴心受压双钢管混凝土短柱正截面承载力的试验研究

对5个双钢管混凝土短柱进行了轴心受压试验。试验结果表明,在轴心受压荷载作用下双钢管混凝土柱的受力全过程是由弹性、弹塑性以及破坏3个阶段组成的,具有很好的延性。由于双钢管混凝土短柱截面含钢率较高,钢管对核心混凝土的约束效应较大,所有试件破坏模式均为腰鼓型破坏。试件的整体工作性能较好,外钢管与内钢管变形一致,试件的极限承载力随着套箍系数增大逐步增加。

Experimental Study of Concrete-filled Double Steel Tubular Short Columns Subjected to Axial Compression Load

The correctness of theory analysis is proved by the test results of 5 concrete-filled double steel tubular short column specimens subjected to axial compression load.The test results show that the whole working process of these specimens consists of three stages,including elastic stage,elastic-plastic stage and failure stage.The test results also show that ductility of all specimens is very good and the load-deformation curves are well keeping with the theory analysis result.Because of the high steel ratio of concrete-filled steel tubular columns,all the specimens are destroyed with drum shape failure mode.The deformation of inner steel tube agrees well with that of the outer steel tube and the load-carrying capacity of the specimen is going up if the confining factor increases.