均质地基地铁车站对临近建筑层间位移角的影响
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摘要
以软土、中软土和中硬土3种均质地基作为研究基准,采用广义层间位移谱,结合有限元计算模型,考虑场地类型和距车站水平距离两个影响因素,分析地铁车站的存在对临近建筑结构的动力影响.结果表明,在地震动作用下,地铁车站的存在将增加临近地表建筑结构的层间位移角,给结构的安全性和抗震性能带来不利影响;随着距离车站水平距离的增加,地铁车站的影响将逐渐减小.结合本文算例初步认为,在软土场地条件下,地铁车站的影响最为显著;同时给出不同场地条件下,地铁车站所能影响的区域范围以供参考.软土场地中,地铁车站对距离车站2.0倍车站水平宽度范围外的地表建筑的影响仍十分明显,需要妥善考虑;而在硬土场地条件下,当距离车站的水平距离超过1.5倍车站宽度时,车站的影响已可忽略.
Generalized inter-story drift spectrum,in which the existing structures are equivalently simplified as combined shear-flexural beams and the FEM models,was used to analyze the influence of a subway station,which was supposed to be buried in three types of homogeneous foundations respectively on the inter-story drift and anti-seismic performance of nearby buildings.It is illustrated that the existence of subway station will increase the inter-story drift of adjacent structures,which is harmful for the safety and the seismic performance;the influence of the subway station decreases gradually as the distance of the building to the subway station increases.According to the cases analyzed in this paper,the influence of the subway station is the most significant when the station is buried in soft site.Moreover,the approximate range of influence of the subway station in special site conditions were given and discussed:for the soft site condition,the buildings away from the station with a distance 2.0times the length of the station will still be affected;and in the hard site,the calculations obtained from the conditions with and without the subway station are almost the same when the distance equals to 1.5times the length of the station.
Generalized inter-story drift spectrum,in which the existing structures are equivalently simplified as combined shear-flexural beams and the FEM models,was used to analyze the influence of a subway station,which was supposed to be buried in three types of homogeneous foundations respectively on the inter-story drift and anti-seismic performance of nearby buildings.It is illustrated that the existence of subway station will increase the inter-story drift of adjacent structures,which is harmful for the safety and the seismic performance;the influence of the subway station decreases gradually as the distance of the building to the subway station increases.According to the cases analyzed in this paper,the influence of the subway station is the most significant when the station is buried in soft site.Moreover,the approximate range of influence of the subway station in special site conditions were given and discussed:for the soft site condition,the buildings away from the station with a distance 2.0times the length of the station will still be affected;and in the hard site,the calculations obtained from the conditions with and without the subway station are almost the same when the distance equals to 1.5times the length of the station.
引文
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[10]王子辉.饱和两相与单相土互层场地中地铁车站地震反应分析[D].北京:北京交通大学土木工程学院,2008:39-40.WANG Zi-hui.Seismic analysis of subway station in a site in-terbedded by saturated two-phase and single-phase soil[D].Beijing:School of Civil Engineering,Beijing Jiaotong Universi-ty,2008:39-40.(In Chinese)
[2]陈国兴,庄海洋,徐烨.软弱地基浅埋隧洞对场地设计地震动的影响[J].岩土工程学报,2004,26(6):739-744.CHEN Guo-xing,ZHUANG Hai-yang,XU Ye.A study oninfluence of excavated shallow tunnel on design parameters ofground motion in the soft site[J].Chinese Journal of Geotech-nical Engineering,2004,26(6):739-744.(In Chinese)
[3]IWAN W D.Drift spectrum:measure of demand for earth-quake ground motions[J].Journal of Structural Engineering,1997,123(4):397-404.
[4]MIRANDA E,AKKAR S D.Generalized interstory driftspectrum[J].Journal of Structural Engineering,2006,132(6):840-852.
[5]MIRANDA E,RSYES C J.Approximate lateral drift demandsin multistory buildings with nonuniform stiffness[J].Journalof Structure Engineering,2002,128(7):840-849.
[6]MIRANDA E,TAGHAVI S.Approximate floor accelerationdemands in multistory building I:Formulation[J].Journal ofStructural Engineering,2005,131(2):203-211.
[7]YANG Di-xiong,PAN Jian-wei,LI Gang.Interstory drift ra-tio of building structures subjected to near-fault ground mo-tions based on generalized drift spectral analysis[J].Soil Dy-namics and Earthquake Engineering,2010,30(11):1182-1197.
[8]HUO H,BOBET A,FERNNDEZ G,et al.Load transfermechanisms between underground structure and surroundingground:evaluation of the failure of the Daikai station[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2005,131(12):1522-1533.
[9]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49-56.DU Xiu-li,ZHAO Mi,WANG Jin-ting.A stress artificialboundary in FEM for near-field wave problem[J].ChineseJournal of Theoretical and Applied Mechanics,2006,38(1):49-56.(In Chinese)
[10]王子辉.饱和两相与单相土互层场地中地铁车站地震反应分析[D].北京:北京交通大学土木工程学院,2008:39-40.WANG Zi-hui.Seismic analysis of subway station in a site in-terbedded by saturated two-phase and single-phase soil[D].Beijing:School of Civil Engineering,Beijing Jiaotong Universi-ty,2008:39-40.(In Chinese)
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