地铁车站结构随机振动响应分析
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摘要
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。
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.
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.
引文
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[7]周爱红,袁颖,张鸿儒.基于ANSYS二次开发技术的土层随机地震反应分析[J].煤炭学报,2007,32(11):1175-1178.
[8]赵岩,王德吉,张亚辉,林家浩.压电智能桁架随机动力特性研究[J].机械科学与技术,2007,26(3):287-291.
[9]徐瑞,苏成.结构非平稳随机响应分析的快速虚拟激励法[J].计算力学学报,2010,27(5):822-827.
[10]刘高,王秀伟.基于虚拟激励法的大跨桥梁抖振内力分析[J].计算力学学报,2003,20(6):649-654.
[11]刘高,林家浩,王秀伟.考虑全桥耦合的大跨斜拉桥抖振内力分析[J].大连理工大学学报,2003,43(4):479-483.
[12]阮松,冯美华.浅埋暗挖地铁站厅施工过程的三维数值模拟分析[J].铁道标准设计,2009(10):65-68.
[2]于翔.地下建筑结构应充分考虑抗震问题—1995年阪神地震破坏的启示[J].工程抗震,2002(4):17-20.
[3]还毅,方秦,柳锦春,陈力,杜茂林.提高地铁车站结构抗震能力的理论及数值分析[J].振动与冲击,2011,30(3):252-257.
[4]陈国兴,陈磊,景立平,龙慧.地铁地下结构抗震分析并行计算显式与隐式算法比较[J].铁道学报,2011,33(11):111-117.
[5]任强.基于ANSYS的某明挖地铁车站抗震分析[J].现代商贸工业,2010,22(11):334-335.
[6]鲍鹏,盛桂琳.地铁车站抗震性能研究[J].河南大学学报:自然科学版,2009,39(4):428-431.
[7]周爱红,袁颖,张鸿儒.基于ANSYS二次开发技术的土层随机地震反应分析[J].煤炭学报,2007,32(11):1175-1178.
[8]赵岩,王德吉,张亚辉,林家浩.压电智能桁架随机动力特性研究[J].机械科学与技术,2007,26(3):287-291.
[9]徐瑞,苏成.结构非平稳随机响应分析的快速虚拟激励法[J].计算力学学报,2010,27(5):822-827.
[10]刘高,王秀伟.基于虚拟激励法的大跨桥梁抖振内力分析[J].计算力学学报,2003,20(6):649-654.
[11]刘高,林家浩,王秀伟.考虑全桥耦合的大跨斜拉桥抖振内力分析[J].大连理工大学学报,2003,43(4):479-483.
[12]阮松,冯美华.浅埋暗挖地铁站厅施工过程的三维数值模拟分析[J].铁道标准设计,2009(10):65-68.
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