多点激励下大跨隔震结构分析模型

Analysis model for long-span isolated structure subjected to multi-support earthquake excitations

基于多点地震激励下大跨隔震结构分析模型存在一定适用范围这一事实,通过理论研究和数值分析对此进行讨论,以指导其合理应用.首先探讨了加速度模型和位移模型中不可忽视的阻尼问题,并针对大跨隔震结构的结构形式和动力特征,通过严格的理论推导阐述了加速度模型和位移模型各自存在的误差和适用性;进一步指出位移模型在隔震结构中盲目应用会导致错误结果,需要加以修正;最后通过简单数值算例对2种模型以及修正模型的计算精度进行了分析.理论研究和数值分析验证了多点地震分析模型在大跨隔震结构应用中存在的问题.

Analysis models of long-span isolated model under multi-support earthquake excitations have limited application range,thus theoretical and numerical research were carried out to guide the reasonable application of analysis models.The nonnegligible damping characteristics in the displacement model and acceleration model were firstly studied,and by considering its special structural type and dynamic properties of long-span isolated structure,a rigorous theory derivation were carried out to explain the availability and probable existing problems in the two models.It is pointed out that the displacement model would produce huge error in the earthquake analysis of long-span isolated structures and it should be revised for more accurate results.Finally,numerical work was carried out for verifying the proposed theoretic analysis results about displacement model and acceleration model.