地震动特性及输入方式对地铁车站结构地震响应的影响
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摘要
随着地下结构抗震理论与设计方法的发展,有限元方法逐渐被广泛地运用于地下结构的抗震分析与计算中。基于有限元方法,考虑不同地震动特性及输入方式对地铁车站结构地震响应的影响。结果表明:能量主要集中在低频区段的地震动荷载对地铁车站结构的地震响应影响比较明显,而且应力与位移的响应值较大。此外,对不同地震动输入方式进行比较分析后,可知输入速度时程且设置黏弹性边界的结果较为理想。通过不同地震动特性及输入方式的应力计算,均可得到中柱顶部与底部的应力响应值最大,在实际的工程设计与施工时应采取相应的措施。
With the development of the seismic theory and design methods in underground structures,the finite element method is widely used in the analysis and calculation of underground structures' seismic gradually.Based on the finite element method,it is taken we taking into account the effects of different ground motion characteristics and input patterns on the seismic response of subway station structures.The results show that the seismic load with its' energy concentrated in the low frequency section have significant effect on the seismic response of subway station structures,and the response's stress and displacement are large.In addition,through comparing and analyzing different input methods of ground motion it is known that it's ideal to input velocity time history with setting visco-elastic boundary.Through the stress calculating by different ground motion characteristics and input patterns,it is also known that the stress response value at the top and bottom of the column is max,so appropriate measures should be taken in the actual design and construction.
With the development of the seismic theory and design methods in underground structures,the finite element method is widely used in the analysis and calculation of underground structures' seismic gradually.Based on the finite element method,it is taken we taking into account the effects of different ground motion characteristics and input patterns on the seismic response of subway station structures.The results show that the seismic load with its' energy concentrated in the low frequency section have significant effect on the seismic response of subway station structures,and the response's stress and displacement are large.In addition,through comparing and analyzing different input methods of ground motion it is known that it's ideal to input velocity time history with setting visco-elastic boundary.Through the stress calculating by different ground motion characteristics and input patterns,it is also known that the stress response value at the top and bottom of the column is max,so appropriate measures should be taken in the actual design and construction.
引文
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[4]庄海洋,陈国兴.基于子结构法的地铁车站地震反应分析[J].岩土力学,2005,26(增):227-231.
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[6]李彬.地铁地下结构抗震理论分析与应用研究[D].北京:清华大学,2005.
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