大型土-桩-复杂结构振动台模型试验研究
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摘要
以天津站交通枢纽工程为背景,开展考虑相互作用效应的大型土-桩-复杂结构振动台模型试验研究。文中主要对试验的相关问题进行阐述,通过对试验部分结果进行分析,初步得出土-桩-复杂结构体系的振动响应规律,检验了结构的抗震性能。试验结果表明:随着震级增加,土-桩-结构之间的相互作用影响加大,土和结构及桩的塑性发展加剧,体系的自振频率明显降低,阻尼增大,结构特别是地上结构的加速度放大系数减小较多,结构的最大应变、最大位移及最大动土压力均有所增长;加载结束,土和结构及桩均出现局部破坏现象,但地上结构最大层间位移角基本满足规范限值,说明结构坏而不倒,符合结构抗震设防的原则。
A shaking table test studying large-scale soil-pile-complex structure interaction is accomplished for the transport hub of Tianjin Station.The initial vibration response of soil-pile-complex structure is obtained,and the structure seismic performance analyzed using test data.The study indicates that with seismic magnitude increasing,the effect of soil-pile-structure interaction becomes more significant and the plasticity in soli-pile-structure develops rapidly.The natural frequency of the system decreases obviously while the damping increases and the acceleration amplification factor,especially for the ground structure,reduces significantly.At the same time,the maximum strain,maximum displacement and soil maximum dynamic pressure of the structure all become larger.At the end of the test,partial damage appears in soil-pile-complex structure and the maximum inter-story drift angles for the ground structure generally meet code requirement.There is no structure collapse but local damage,consistent with the principle of seismic structure design.
A shaking table test studying large-scale soil-pile-complex structure interaction is accomplished for the transport hub of Tianjin Station.The initial vibration response of soil-pile-complex structure is obtained,and the structure seismic performance analyzed using test data.The study indicates that with seismic magnitude increasing,the effect of soil-pile-structure interaction becomes more significant and the plasticity in soli-pile-structure develops rapidly.The natural frequency of the system decreases obviously while the damping increases and the acceleration amplification factor,especially for the ground structure,reduces significantly.At the same time,the maximum strain,maximum displacement and soil maximum dynamic pressure of the structure all become larger.At the end of the test,partial damage appears in soil-pile-complex structure and the maximum inter-story drift angles for the ground structure generally meet code requirement.There is no structure collapse but local damage,consistent with the principle of seismic structure design.
引文
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[12]姜忻良,管晔,焦莹.考虑桩土效应的天津站交通枢纽地震反应分析[J].地震工程与工程振动,2008,28(5):163-169(Jiang Xinliang,Guan Ye,Jiao Ying.Seismic response analysis of Tianjin transportation junctionconsidering effect of pile and soil[J].EarthquakeEngineering and Engineering Vibration,2008,28(5):163-169(in Chinese))
[13]尚守平,刘方成,卢华喜,等.振动台试验模型地基土的设计与试验研究[J].地震工程与工程振动,2006,26(4):199-204(Shang Shouping,Liu Fangcheng,LuHuaxi,et al.Design and experimental study of a model soilused for shaking table test[J].Earthquake Engineeringand Engineering Vibration,2006,26(4):199-204(inChinese))
[2]Lenart G,Tarek A,Ricardo D.Effect of soil permeabilityon centrifuge modeling of pile response to lateral spreading[C]//Proceedings of Seismic Performance and Simulationof Pile Foundations.2006:50-60
[3]陈国兴,庄海洋,杜修力,等.土-地铁车站结构动力相互作用大型振动台模型试验研究[J].地震工程与工程震动,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))
[4]陈国兴,庄海洋,杜修力,等.液化场地土-地铁车站结构大型振动台模型试验研究[J].地震工程与工程震动,2007,27(3):163-170(Chen Guoxing,ZhuangHaiyang,Du Xiuli,et al.Large-scale shaking table test forsubway station structure built in liquefiable saturated fineand soil[J].Earthquake Engineering and EngineeringVibration,2007,27(3):163-170(in Chinese))
[5]楼梦麟,宗刚,牛伟星,等.土-桩-钢结构相互作用体系的振动台模型试验[J].地震工程与工程振动,2006,26(5):226-230(Lou Menglin,Zong Gang,Niu Weixing,et al.Shaking table model test of soil-pile-steel structureinteraction system[J].Earthquake Engineering andEngineering Vibration,2006,26(5):226-230(inChinese))
[6]陶连金,王沛霖,边金.典型地铁车站结构振动台模型试验[J].北京工业大学学报,2006,32(9):798-801(Tao Lianjin,Wang Peilin,Bian Jin.A shaking table testmethod on the representative subway station structure[J].Journal of Beijing University of Technology,2006,32(9):798-801(in Chinese))
[7]杨林德,季倩倩,郑永来,等.软土地铁车站结构的振动台模型试验[J].现代隧道技术,2003,40(1):7-11(Yang Linde,Ji Qianqian,Zheng Yonglai,et al.Shakingtable test on metro station structures in soft soil[J].Modern Tunnelling Technology,2003,40(1):7-11(inChinese))
[8]陈跃庆,吕西林,李培振,等.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):57-64(Chen Yueqing,LüXilin,LiPeizhen,et al.Comparative study on the dynamic soil-structure interaction system with various soils by usingshaking table model tests[J].China Civil EngineeringJournal,2006,39(5):57-64(in Chinese))
[9]楼梦麟,王文剑,朱彤,等.土-结构体系振动台模型试验中土层边界影响问题[J].地震工程与工程振动,2000,20(4):30-36(Lou Menglin,Wang Wenjian,ZhuTong,et al.Soil lateral boundary effect in shaking tablemodel test of soil-structure system[J].EarthquakeEngineering and Engineering Vibration,2000,20(4):30-36(in Chinese))
[10]姜忻良,杨书燕.结构-基础-土-河流相互作用地震反应分析[J].地震工程与工程振动,2006,26(2):138-142(Jiang Xinliang,Yang Shuyan.Earthquake responseanalysis of structure-foundation-soil-river interaction system[J].Earthquake Engineering and Engineering Vibration,2006,26(2):138-142(in Chinese))
[11]姜忻良,袁蕾,高海.卵形消化池-桩-土相互作用地震反应分析[J].地震工程与工程振动,2007,27(6):154-159(Jiang Xinliang,Yuan Lei,Gao Hai.Seismicresponse analysis of egg-shaped digester-pile-soil interactionsystem[J].Earthquake Engineering and EngineeringVibration,2007,27(6):154-159(in Chinese))
[12]姜忻良,管晔,焦莹.考虑桩土效应的天津站交通枢纽地震反应分析[J].地震工程与工程振动,2008,28(5):163-169(Jiang Xinliang,Guan Ye,Jiao Ying.Seismic response analysis of Tianjin transportation junctionconsidering effect of pile and soil[J].EarthquakeEngineering and Engineering Vibration,2008,28(5):163-169(in Chinese))
[13]尚守平,刘方成,卢华喜,等.振动台试验模型地基土的设计与试验研究[J].地震工程与工程振动,2006,26(4):199-204(Shang Shouping,Liu Fangcheng,LuHuaxi,et al.Design and experimental study of a model soilused for shaking table test[J].Earthquake Engineeringand Engineering Vibration,2006,26(4):199-204(inChinese))
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