克服薄膜效应的新型分阶段耗能器性能研究

Study on the Performance of New Phased Energy Dissipation Device Dispensed with Membrane Effect

薄膜效应一直是钢板屈服耗能器值得注意的问题,却往往被设计者们忽视。本文首先通过理论分析、有限元软件模拟相结合的方法,论证了其对弯曲型耗能器会产生不容忽视的影响。在此基础上,又基于经典的弯曲型软钢阻尼器,提出一种新型的双X型软钢耗能器,此耗能器不仅能够克服常规弯曲型耗能器会产生的薄膜效应,还能通过采用不同材质的耗能钢板达到分阶段耗能。通过ABAQUS对该新型耗能器进行仿真模拟,对其耗能机理、力学性能、耗能性能进行分析研究。结果表明:此新型耗能器滞回曲线规则饱满,分阶段效果良好且性能稳定,有一定的实用价值和应用前景。

Membrane effect is a noticeable problem of metal dampers, but always ignored by designers. The importance of membrane effect is improved in this article by the combination of mechanical analysis and finite element method. A new type mild steel damper with double-X shape is presented based on the classic bending damper,which can not only overcome the membrane effect caused by common bending energy dissipation devices,but also achieves a phased energy dissipation mechanism by using different kinds of steel. The analysis of the energy dissipation mechanism, mechanical properties and energy dissipation ability of the new type mild steel damper under cycle-loading test is carried out by ABAQUS. The result shows that the proposed new damper owns superior dissipation performance.