宽厚比对新型屈曲约束支撑性能影响的试验研究

Experimental study on the influence of width to thickness ratio on bracing performance of new buckling constraint

提出一种新型屈曲约束支撑,运用切削工艺将支撑核心段削薄,从而解决传统支撑自重大、端部易屈曲等问题.通过对核心段宽厚比分别为10和14的屈曲约束支撑试件进行低周拉压循环试验,对比分析其失效模式、滞回性能、耗能能力、累积塑性变形能力等各项力学性能,探究核心段宽厚比对支撑抗震性能的影响.研究结果表明,各试件滞回曲线饱满,耗能系数随位移幅值增加而增大,最大不低于3.0,耗能能力较好.累积塑性变形均大于规范规定的最小值200,具有较好的延性.设计时,建议芯材宽厚比在5~10之间.

In this paper,a new type of buckling constrained support is presented,in which the core section of the support is thined by cutting technology,so as to solve the problems such as self-weight of traditional support and easy end buckling.By conducting low-cycle tensile and compressive cyclic tests on the flexural constrained bracing specimens with core section width and thickness ratios of 10 and 14 respectively,the failure mode,hysteretic performance,energy dissipation capacity,cumulative plastic deformation capacity and other mechanical properties were compared and analyzed to explore the influence of core section width and thickness ratio on the seismic performance of bracing.The results show that the hysteretic curve of each specimen is full,the energy dissipation coefficient is concentrated at 2.0,and the energy dissipation capacity is good.The cumulative plastic deformation is greater than the minimum value of 200 and has good ductility.When designing,it is suggested that the width to thickness ratio of core material should be between 5-10.