波形反对称软钢阻尼器力学性能试验研究

设计了一种波形软钢阻尼器,针对其滞回力学特性和耗能减震能力,进行了2个波形钢板不同放置形式的波形软钢阻尼器的拟静力试验,试验结果表明波形软钢阻尼器具有稳定的滞回性能和良好的塑性变形能力。其中由于竖向波形软钢阻尼器在水平方向会产生拉压应力场,压缩刚度大,导致其滞回性能和延性均比水平波形软钢阻尼器的差。在整个试验加载过程中,未出现焊缝撕裂现象,说明二氧化碳保护焊可以很好地保证阻尼器整体结构承载和变形能力。利用ABAQUS有限元分析软件建立6个波形软钢阻尼器模型,以试验中的水平波形软钢阻尼器作为基本模型,钢板厚度和波角两个因素作为变量,进行数值分析,结果表明:模拟分析与试验结果吻合较好;当钢板波角为60°时,波形软钢阻尼器力学性能最优;钢板厚度过大会使阻尼器角部应力集中,过早产生局部屈曲,而厚度偏小会使得阻尼器的耗能能力和承载能力不佳,钢板厚度取值6 mm时力学性能最佳。

Experimental research on mechanical behavior of corrugated antisymmetric mild steel damper

A mild steel damper with corrugated shape was designed. Quasi-static tests on two mild steel dampers with different corrugated placement forms were conducted to study the hysteretic mechanical behaviors and energy dissipating capacity of the damper. The experimental results show that the corrugated mild steel damper has stable hysteretic behavior and favorable plastic deforming capability. Because the vertically corrugated mild steel damper has a tension and compression field in the horizontal direction, the compression stiffness of the damper is bigger and the hysteretic behavior and the ductility of the vertical corrugated mild steel damper are inferior to those of the horizontal one. No tearing phenomenon of the weld can be observed during the whole loading process. Therefore, carbon-dioxide arc welding can ensure the load-carrying and deforming capacity of the whole damper. Correspondingly, six models of corrugated mild steel damper were established through ABAQUS finite element analysis software. Using the tested horizontal corrugated mild steel damper as the basic model, the finite element analysis was carried out based on the variables of plate thickness and corrugated angle. The simulation results show that the numerical simulation analysis results are consistent with the experimental results. When the wave angle is 60°, the corrugated mild steel damper has the best mechanical properties. If the thickness of the steel plate is too large , it will cause premature local buckling and stress concentration in the corner of damper. On the contrary, if the thickness of the steel plate is too small, it will cause low energy dissipating capacity and low carrying capacity of the damper. It can be concluded that the mild steel damper has the most favorable mechanical behavior when the thickness of the steel plate is 6 mm.