腹板式钢制防屈曲支撑力学性能试验研究

Experimental investigation on mechanical performances of an innovative H type steel-unbuckling-brace

防屈曲支撑是一种具有良好应用前景的耗能减震构件,兼具中心支撑和位移型阻尼器的功能,克服了传统支撑受压屈曲的缺点。提出了由平板截面焊接组合而成且芯板为低屈服点钢的腹板式钢制防屈曲支撑,为检验其抗震性能,对4个试件进行拟静力往复加载试验。研究了试件的受力过程及耗能机理,并对力-位移滞回曲线、恢复力模型、累计塑性变形及能量耗散能力等抗震性能进行了分析,基于ANSYS软件对试件的滞回性能进行了模拟,并与试验结果进行了对比分析,验证了这种防屈曲支撑工作可靠,具有良好的滞回性能及低周疲劳性能。数值计算表明,在地震动作用下装有这种防屈曲支撑的框架结构具有良好的减震效果。

As a new type of prospective component for energy dissipation and vibration reduction, unbuckling-brace is a composite bracing member which can act as conventional central brace without buckling and displacement type damper, and overcomes the shortcoming of buckling characteristics of conventional braces. In this paper, H type steel-unbuckling-brace （SUB） which was welded by using steel flats and core made of low yield steel was presented at first. Quasi-static tests with reciprocating loads were conducted on four steel H type unbuckling-brace specimens for testing the seismic performances. The loading process and energy dissipation mechanism of these SUB specimens were studied, moreover, seismic performances, such as force-displacement hysteretic curve, resilience model, accumulative plastic deformation and energy dissipation capabil- ity are analyzed too. At last the hysteretic curves for the specimens were simulated based on ANSYS and compared with the experimental results. The better hysteretic behavior and high energy dissipation of SUB were verified. Numerical simulation results show that the frame structure with H type steel-unbuckling-brace has good seismic absorption effect.