新型多功能隔震支座力学性能的数值模拟与实验验证

NUMERICAL SIMULATION AND EXPERIMENTAL VERIFICATION OF THE MECHANICAL PROPERTIES OF MULTIFUNCTIONAL ISOLATION BEARINGS

  • 摘要: 为满足桥梁在正常使用荷载与地震极端荷载等不同工况下的性能需求,该文设计制作了一种新型多功能隔震支座,基于ANSYS有限元平台,建立了该支座的精细有限元模型,对其力学性能进行了数值模拟与试验验证。数值结果表明:在350 kN竖向压力作用下,部分铅芯已进入塑性状态,橡胶则处于三向受力状态,其静水压力远大于Mises应力;在100 mm横向剪切位移作用下,单层橡胶片各处剪切应力仍近似相等,相差不超过5%,铅芯则发生了很大的塑性应变,最大Mises塑性应变值达到0.580。数值计算结果与该支座试验数据对比表明,支座数值计算所得剪切性能滞回曲线与试验结果一致性较好,验证了该文数值模拟的准确性与可靠性。

     

    Abstract: To meet the different performance requirements of bridges under normal load and severe seismic load, a new type of multifunctional isolation bearing was designed. Finite element models of the bearing was developed in ANSYS, and the numerical simulation and experimental verification of the bearing were conducted. The results of the numerical analyses indicated that part of the lead core had come into plastic state when a vertical load of 350 kN was applied, and the laminated rubber was in compression in the trip-directions, whose hydrostatic pressure was much larger than the Mises stress. After 100 mm shear displacement was applied, the shear stress of the laminated rubber was still almost the same at different locations and the difference is lower than 5%, while the lead core underwent very large plastic deformations with 0.580 maximal Mises plastic strain. Besides, hysteresis loops of the bearing obtained from the simulation tests were consistent with the results of the shear strain and the vertical load correlation experiments, which verifies the accuracy of the numerical simulation of the bearing.

     

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