椭圆形钢铅耗能器性能及振动台试验

针对工字型钢铅组合耗能器直角区域容易应力集中、过早屈服断裂退出工作的问题,提出一种由钢和铅两种材料组成的椭圆形钢铅耗能器,这种耗能器加工简便且水平两个方向都具有良好耗能性能.首先,对椭圆形钢铅耗能器中钢板的平面应力进行分析.其次,对椭圆形钢铅耗能器进行力学性能试验;利用有限元分析软件ANSYS建立椭圆形钢铅耗能器的非线性计算模型进行数值分析并与性能试验结果进行对比.最后,对一个安装和不安装椭圆形钢铅耗能器的六层钢框架结构模型进行振动台对比试验.研究结果表明:数值分析结果与性能试验结果吻合良好,本文建立椭圆形钢铅耗能器数值计算模型的方法正确;椭圆形钢铅耗能器滞回曲线饱满,具有良好耗能能力;椭圆形钢铅耗能器对多层结构的地震反应具有较好减震效果.

Mechanical property and shaking table test of oval steel-lead damper

To deal with the problem of stress concentration and component failure at the right-angle area of I-shaped combined steel lead damper, an oval steel-lead damper (OSLD) composed of steel and lead was presented, which had advantage of simple manufacture process and good energy dissipation capacity in the two horizontal directions. Plane stress analysis of the steel plate of OSLD was performed. The mechanical property tests of OSLD were carried out, and the nonlinear analysis model was established by ANSYS, of which results were compared to the test results. The shaking table tests of a six-storey steel frame structure model with and without OSLDs were performed and compared. Research results show that the numerical simulation results are in agreement with the test results, which indicate that the method of establishing numerical model is correct. The OSLD has full hysteresis curves and good energy dissipation capacity, and the OSLD has well vibration control effect of seismic responses on multi-storey structure.