地铁换乘站不规则结构对其地震响应的影响
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摘要
地铁换乘站由于功能要求,多为复杂的不规则结构。本文通过对一具有实际工程背景的地铁换乘站进行地震响应弹塑性时程分析,着重从结构的位移响应、侧向变形以及结构柱的内力响应等方面考察了不规则结构对其地震响应的影响。结果表明:周围土体的约束作用有利于减轻地下不规则结构的扭转效应;结构的竖向不规则性对地震响应产生的影响不仅与结构竖向刚度突变有关而且还与周围土体对结构的约束差异有关;地下不规则结构会引起较明显的应力集中现象。相关结论可为类似地下工程的抗震设计提供参考。
The subway transfer stations are mostly complex irregular structures in order to meet the functional requirements.By means of the seismic elasto-plastic time-history analysis of a subway transfer station based on practical engineering,the influence of irregular structure on its seismic responses is investigated in this paper from the respects,such as the structural displacement responses,the structural lateral deformations and the internal force responses of structure columns.The results show that the restriction effects of soil around is favorable for lightening the torsional effect of the irregular underground structure;the influence of the structure's vertical irregularity on its seismic responses is not only due to the abruptness of vertical stiffness,but also due to the different restriction effect of soil around;the irregular underground structure tends to induce the stress concentration with seismic effect.The related conclusions can also provide reference for the aseismatic design of similar underground constructions.
The subway transfer stations are mostly complex irregular structures in order to meet the functional requirements.By means of the seismic elasto-plastic time-history analysis of a subway transfer station based on practical engineering,the influence of irregular structure on its seismic responses is investigated in this paper from the respects,such as the structural displacement responses,the structural lateral deformations and the internal force responses of structure columns.The results show that the restriction effects of soil around is favorable for lightening the torsional effect of the irregular underground structure;the influence of the structure's vertical irregularity on its seismic responses is not only due to the abruptness of vertical stiffness,but also due to the different restriction effect of soil around;the irregular underground structure tends to induce the stress concentration with seismic effect.The related conclusions can also provide reference for the aseismatic design of similar underground constructions.
引文
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[7]GB50011-2001建筑抗震设计规范[S].北京:中国计划出版社,2002.
[2]庄海洋,宰金珉,陈国兴.土-地下结构的非线性动力相互作用——理论及应用[J].自然灾害学报,2006,15(6):174-181.
[3]刘晶波,刘祥庆,杜修力.地下结构抗震理论分析与试验研究的发展展望[J].地震工程与工程振动,2007,27(6):38-45.
[4]钟善桐.钢管混凝土统一理论——研究与应用[M].北京:清华大学出版社,2006.
[5]姜忻良,郑刚,张新旺.复合地基物理模型及圆板-复合地基系统分析[J].岩土力学,1997,18(4):63-68.
[6]刘晶波,王振宇,杜修力,等.波动问题中的三维时域黏弹性人工边界[J].工程力学,2005,22(6):46-51.
[7]GB50011-2001建筑抗震设计规范[S].北京:中国计划出版社,2002.
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