基于ADINA软基上地震动输入方法研究及其应用

Study on Method of Earthquake Input on Soft Foundation Based on ADINA and Its Application

针对传统的刚性边界模型不能真实反映结构与地基的相互作用且对结构的动力响应影响较大的问题,研究了ADINA中实现软基上等效一致黏弹性人工边界及在该边界上波动输入的方法和技术,将其应用于某软基上泵站的三维结构—地基—水体有限元模型,在地震荷载下对结构进行动力分析,并与传统无质量地基模型结果进行对比,发现考虑地基辐射阻尼能有效降低泵站的动力响应,表明本文方法可行、有效。

Due to the traditional rigid boundary model failing to truly reflect the interaction between the structure and foundation and its great effect of structural dynamic response, the method and technology to realize equivalent consistent viscoelastic artificial boundary and wave imput on the boundary in ADINA are studied. It is applied to analyze three-dimensional structure-foundation-water finite element of pumping station in soft foundation. Dynamic analysis is made on the structure under the action of earthquake load. Then the results are compared to those of the traditional massless foundation model. It is found that the foundation radiation damping can effectively reduce dynamic response of pumping sta- tion. Therefore, the proposed method is feasible and effective.