新型自复位三维隔震结构动力响应数值模拟分析

Numerical Simulation Analysis of Dynamic Response for Innovative Self-centering Three-dimensional Isolated Structure

针对常规水平隔震结构竖向加速度被放大、钢弹簧三维隔震支座抗拉能力差且易发生提离失效等问题,研发新型自复位抗拉三维隔震支座,使结构具有三维隔震能力,防止支座发生提离失效。通过有限元分析软件SAP2000建立采用叠层橡胶隔震支座的常规水平隔震结构模型和采用新型自复位抗拉三维隔震支座的三维隔震结构模型,并对比分析不同地震波作用下的结构动力响应。研究结果表明,常规水平隔震结构水平加速度响应相对于地面显著减小,但竖向加速度响应相对于地面显著增大;三维隔震结构水平加速度响应相对于地面显著减小,竖向加速度响应相对于地面未出现显著放大现象;在地面峰值加速度为06g的工况下,常规水平隔震结构隔震支座进入受拉状态,但三维隔震结构隔震支座一直处于受压状态。

Aiming at the problems of enlarged vertical acceleration of conventional horizontal isolation structures,poor tensile strength of steel spring three-dimensional isolation bearings and easy lift-off failures,a innovative self-centering three-dimensional isolation bearings was proposed to make the structure have three-dimensional isolation capability and prevent the isolator from lifting failure.The finite element analysis software SAP2000 was used to establish a conventional horizontal isolated structure with laminated rubber isolation bearings and a three-dimensional isolated structure with self-centering three-dimensional isolation bearings.The dynamic response of the two models under different seismic waves were compared and analyzed.The research results show that the horizontal acceleration response of the conventional horizontal isolated structure is reduced relative to the ground acceleration,however,the vertical acceleration response of the conventional horizontal isolated structure is significantly enlarged relative to the ground acceleration.The horizontal acceleration response of the three-dimensional isolated structure is significantly reduced relative to the ground acceleration.The vertical acceleration response of the three-dimensional isolated structure is equivalent to the ground acceleration,and there is no acceleration amplification.When the peak ground acceleration is 06g,the isolation bearings of the conventional horizontal isolated structure is in tension state,however,the isolation bearings of the three-dimensional isolated structure are always in compression state.