近远场地震作用下液化地基上地铁车站结构动力损伤特性的振动台试验
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摘要
考虑近、远场地震动作用,针对可液化场地条件下的三跨三层地铁车站结构,进行土-地下结构动力相互作用振动台模型试验,分析地铁车站结构的加速度、侧向水平位移和动应变的反应规律,研究近远场地震作用下可液化场地上地铁车站结构动力损伤特性。结果表明:不同高度处的加速度反应存在差别,结构中下部的加速度反应大于其他位置的加速度反应;比较结构侧墙和结构侧边地基土的的峰值加速度值,发现液化场地条件下结构某些部位的峰值加速度反应可能比周围场地的峰值加速度反应要大;车站结构中柱的应变反应最大,侧墙的反应次之,板的反应最小,并且底层中柱的应变反应最大值大于顶层和中层的中柱应变反应最大值。采用应变损伤度衡量结构的破坏程度,在地震动作用下车站结构底层中柱底端的损伤程度最为严重。
Considering both the near-fault and far-field seismic motions for a subway station structure of three stories and three spans in liquefiable ground,a series of shaking table experiments on the dynamic interaction between soil and underground structure is conducted.The dynamic damage behavior of subway station structures in liquefiable foundation under near-fault and far-field motions are analyzed,with analyses of the acceleration,lateral displacement and dynamic strain responses of the structure.It is found that the ground motion characteristics have great influence on the acceleration response and the values of acceleration are different at different heights of the side walls.In addition,the acceleration responses of the middle and lower part of the side wall are more intense than other locations.The peak acceleration responses of certain parts of the structure are more significant than the peak acceleration response of the soils.The strain response of the interior column is the most remarkable,while the side walls are second,and the slab response is the weakest.The interior column in the bottom story exhibits a larger strain response than the top story and other intermediate stories.The concept of the damage level is introduced to measure the degree of the destruction under seismic motions.The level of damage of the bottom of columns of the bottom part of the station structure is most serious under ground motions.
Considering both the near-fault and far-field seismic motions for a subway station structure of three stories and three spans in liquefiable ground,a series of shaking table experiments on the dynamic interaction between soil and underground structure is conducted.The dynamic damage behavior of subway station structures in liquefiable foundation under near-fault and far-field motions are analyzed,with analyses of the acceleration,lateral displacement and dynamic strain responses of the structure.It is found that the ground motion characteristics have great influence on the acceleration response and the values of acceleration are different at different heights of the side walls.In addition,the acceleration responses of the middle and lower part of the side wall are more intense than other locations.The peak acceleration responses of certain parts of the structure are more significant than the peak acceleration response of the soils.The strain response of the interior column is the most remarkable,while the side walls are second,and the slab response is the weakest.The interior column in the bottom story exhibits a larger strain response than the top story and other intermediate stories.The concept of the damage level is introduced to measure the degree of the destruction under seismic motions.The level of damage of the bottom of columns of the bottom part of the station structure is most serious under ground motions.
引文
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[2]Iwatate T,Kobayashi Y,Kusu H,et al.Investigation andshaking table tests of subway structures of the hyogoken-nanbu earthquake[C]//Proceedings of the 12th WCEE.New Zealand,2000
[3]Tamari Y,Towhata I.Seismic soil-structure interaction ofcross sections of flexible underground structures subjectedto soil liquefaction[J].Soil and Foundation,2003,43(2):69-87
[4]杨林德,季倩倩,郑永来,等.软土地铁车站结构的振动台试验[J].现代隧道技术,2003,40(1):7-11(YangLinde,Ji Qianqian,Zheng Yonglai,et al.Shaking tabletest on metro station structures in soft soil[J].ModernTunnelling Technology,2003,40(1):7-11(in Chinese))
[5]陈国兴,庄海洋,杜修力,等.土-地铁车站动力相互作用的大型振动台模型试验研究[J].地震工程与工程振动,2007,27(2):171-176(Chen Guoxing,ZhuangHaiyang,Du Xiuli,et al.Analysis of large-scale shakingtable test of dynamic soil-subway station interaction[J].Earthquake Engineering and Engineering Vibration,2007,27(2):171-176(in Chinese))
[6]陈国兴,庄海洋,杜修力,等.土-地铁隧道动力相互作用的大型振动台试验—试验结果分析[J].地震工程与工程振动,2007,27(1):164-170(Chen Guoxing,ZhuangHaiyang,Du Xiuli,et al.Alarge-size shaking table test fordynamic soil-metro tunnel interaction—analysis on the testresults[J].Earthquake Engineering and EngineeringVibration,2007,27(1):164-170(in Chinese))[7]陈国兴,王志华,左熹,等.振动台试验叠层剪切型土箱的研制[J].岩土工程学报,2010,32(1):89-97(Chen Guoxing,Wang Zhihua,Zuo Xi,et al.Develop-ment of laminar shear soil container for shaking table tests[J].Chinese Journal of Geotechnical Engineering,2010,32(1):89-97(in Chinese))[8]韩晓健,左熹,陈国兴.基于虚拟仪器技术的振动台模型试验98通道动态信号采集系统研制[J].防灾减灾工程学报,2010,30(5):503-508(Han Xiaojian,ZuoXi,Chen Guoxing.98 Channels’dynamic signalacquisition system development for shaking table test basedon virtual instrument technology[J].Journal of DisasterPrevention and Mitigation Engineering,2010,30(5):503-508(in Chinese))[9]陈国兴,左熹,王志华,等.地铁车站结构近远场地震反应特性振动台试验[J].浙江大学学报:工学版,2010,44(10):1955-1961(Chen Guoxing,Zuo Xi,WangZhihua,et al.Shaking table model test of subway stationstructure under far field and near field ground motion[J].Journal of Zhejiang University:Engineering ScienceEdition,2010,44(10):1955-1961(in Chinese))[10]左熹,杨树才,陈国兴.地铁车站结构非线性地震损伤演化规律分析[J].工程抗震与加固改造,2010,32(1):110-116(Zuo Xi,Yang Shucai,Chen Guoxing.Analysis on evolution of nonlinear seismic damage ofsubway station structure[J].Earthquake ResistantEngineering and Retrofitting,2010,32(1):110-116(inChinese))[11]王道荣.高速侵彻现象的工程分析方法和数值模拟研究[D].合肥:中国科学技术大学,2002(WangDaorong.Study on engineering analytical model andnumerical simulation on hypervelocity penetration[D].Hefei:University of Science and Technology of China,2002(in Chinese))
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