【摘要】 大跨结构在多点多维地震输入下的响应求解问题,需要考虑很多因素。这些因素既包括地震动的特性,如多维及空间相关性等,也包括结构响应的复杂性,如需要分解为动力反应及拟静力反应等。这些因素往往不是独立的,具有耦合性。本文结合北京丰台火车站改建工程,通过有限元软件计算求得各个参数,再利用数值分析软件组合得到部分构件在多点多维地震动下的单元内力,并与单点多维反应谱及多点多维时程分析法得到的结果作比较,验证结果的合理性和准确性;同时还研究了不同传播方向对最后结果的影响。结果表明,多点多维反应谱法在实际工程中应用是完全可行的。更多还原

【Abstract】 In order to get the accurate response under multi-support and multi-component seismic waves input, it is necessary to take many factors into account. Apart from characteristics of ground motion such as multi-component and spatial correlation, the complexity of structural response needs to be considered as well, including dynamic and static component. In general, these factors are coupled rather than independent. To combine with the reconstruction of Fengtai Railway Station, a complex model is calculated with the response spectrum method under multi-support and multicomponent seismic excitations using finite element software, and the internal forces can be acquired from numerical analysis software. Compared with the result from time history analysis, the accuracy and the precision of the result can be verified. Meantime, the influence of different spread directions is taken into account. The result shows that it is reliable to apply the method to engineerings.更多还原