装配式自复位钢柱脚力学性能试验研究

Experimental Study on Mechanical Properties of Fabricated Self-resetting Steel Column Base

设计加工了一个缩尺约为1/3的柱脚试件,将其所受竖向轴力和碟形弹簧的预压力作为试验变量,进行低周往复荷载试验,对比分析了结构受力的发展过程、自复位能力、变形能力和柱脚因本身自有的摩擦而具有的耗能能力。试验结果表明:此装配式自复位钢柱脚消除了传统柱脚的塑性铰问题,在受到外力作用时能有效减小建筑所遭遇的破坏,实现了预期的设计意图;试件的荷载-位移滞回曲线为典型的双旗帜形,卸载后的最大残余变形仅为0.202%,具有良好的自复位性能。

A column base specimen with a scale of about 1/3 is designed and processed.Taking the vertical axial force and the preload of the Belleville spring as test variables,the low cycle reciprocating load test is carried out.The development process of the structure,the self-resetting capacity,the deformation capacity and the energy dissipation capacity of the column base due to its own friction are compared and analyzed.The test results show that the fabricated self-resetting steel column base eliminates the plastic hinge problem of the traditional column base,and can effectively reduce the damage of the building under the action of external forces,realizing the expected design intention.The load displacement hysteresis curve of the specimen is a typical double flag shape,and the maximum residual deformation after unloading is only 0.202%,which has good self-resetting performance.