地铁车站结构随机振动响应分析

基于地震反应的随机非确定性,运用基于概率统计方法的随机振动理论进行结构抗震分析,考察结构的动力可靠度,是一种合理的设计方法。运用虚拟激励法对青岛地铁五四广场站进行随机振动分析,避免了传统方法计算的冗繁,得到了具有统计意义的结构动力响应。考虑x向功率谱输入时,弯矩分布较为均匀;地铁结构体型变化较大的部位剪力明显增大;柱底剪力较小,边跨柱剪力小于中跨柱底剪力。考虑y向功率谱函数输入时,沿梁轴向剪力值逐渐增大,柱底剪力明显大于x向输入时的柱底剪力,边跨柱柱底剪力大于中跨柱底剪力。所得结论为地铁站这一复杂结构形式进行基于可靠度理论的设计提供了依据,可以作为同类设计的参考指导。

Analysis on Random Vibration Response of Metro Station Structure

Considering the random uncertainty of seismic response,doing the structural seismic analysis by means of random vibration theory based on probabilistic method,and then investigating the dynamical reliability of structure,this method really is a reasonable method.This paper,after a random vibration analysis on Wusiguangchang Station of Qingdao Metro using pseudo excitation method,has avoided the tedious work of traditional calculation method,and has obtained dynamic response of the structure with statistical significance.When inputting the power spectrum along the X axis,the bending moment distribution is uniform relatively;the shearing force increases obviously at the change part of body form of the metro structure;the shearing force of the column bottom is relatively small,especially the shearing force of the column bottom of side span is less than that of middle span.When inputting the power spectrum along the Y axis,the shearing force increases gradually along the beam axis direction;the column bottom shearing force is bigger than that of inputting along the X axis;and the column bottom shearing force of the side span is bigger than that of middle span.The conclusion provides the basis for the reliability-based design of the complex structure like the metro station,functioning as reference for similar project design.