大型复杂结构-桩-土振动台模型试验土箱设计
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摘要
以基于天津站交通枢纽的大型复杂结构-桩-土振动台试验为背景,详细介绍土箱设计特别是其边界设计,通过试验数据并结合模型模态分析对边界效应进行定量分析,检验土箱边界实际效果并为边界的进一步改进提供事实依据.研究结果表明:在土箱底部,通过设置分割条嵌入模型土中做成的摩擦边界的效果较好;在土箱垂直于地震动两侧壁上,聚苯乙烯泡沫塑料做成的柔性边界对Taft波和人工波加载的效果比较好,而对天津波加载效果略差;在土箱平行于地震动两侧壁上,通过侧壁内表面贴聚氯乙烯薄膜并涂抹润滑油做成的滑动边界起到一定的效果,但偏差较大.对模型土的模态分析表明:通过提高模型土域的宽高比以及适当减小柔性边界的弹性模量都可以明显减小柔性边界对模型土的影响.土箱设计总体效果较为理想,边界设计及分析可为类似土-结构相互作用振动台试验提供借鉴.
A soil chamber design was discussed in detail,especially its boundary configurations for the shaking table test of the large-scale complex structure-pile-soil interaction of the transportation junction in Tianjin Railway Station.The practical effectiveness of the soil chamber’s boundary was tested quantitatively through data analysis and modal analysis,which could also provide factual basis for optimizing the soil chamber’s boundary configurations.The study shows that the frictional boundary with dividing strip embedded into the model soil at the bottom of the soil chamber works very well.It is also proven that the flexible boundary made of foamed polystyrene on the side walls perpendicular to the seismic direction works well to Taft seismic wave and artificial seismic wave but it doesn’t work so well to Tianjin seismic wave.The sliding boundary using oil lubricated polyvinyl chloride film attached onto the longitudinal inner side surface of the soil chamber works with relatively large deviation.The modal analyses indicate that increasing both the width height ratio of the soil domain and the elastic modulus of flexible boundary can reduce the effects of the flexible boundary on the model soil.It can be concluded that the overall boundary design of the soil chamber is perfectly acceptable,and it provides a good reference to similar shaking table test of soil-structure interaction.
A soil chamber design was discussed in detail,especially its boundary configurations for the shaking table test of the large-scale complex structure-pile-soil interaction of the transportation junction in Tianjin Railway Station.The practical effectiveness of the soil chamber’s boundary was tested quantitatively through data analysis and modal analysis,which could also provide factual basis for optimizing the soil chamber’s boundary configurations.The study shows that the frictional boundary with dividing strip embedded into the model soil at the bottom of the soil chamber works very well.It is also proven that the flexible boundary made of foamed polystyrene on the side walls perpendicular to the seismic direction works well to Taft seismic wave and artificial seismic wave but it doesn’t work so well to Tianjin seismic wave.The sliding boundary using oil lubricated polyvinyl chloride film attached onto the longitudinal inner side surface of the soil chamber works with relatively large deviation.The modal analyses indicate that increasing both the width height ratio of the soil domain and the elastic modulus of flexible boundary can reduce the effects of the flexible boundary on the model soil.It can be concluded that the overall boundary design of the soil chamber is perfectly acceptable,and it provides a good reference to similar shaking table test of soil-structure interaction.
引文
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[2]Lenart Gonzalez,Tarek Abdoun,Ricardo Dobry.Effect of soil permeability on centrifuge modeling of pile re-sponse to lateral spreading[C]//Seismic Performance and Simulation of Pile Foundations,ASCE.Davis,California,USA,2006:50-60.
[3]Su D,Li X S.Effect of shaking intensity on seismic re-sponse of single-pile foundation in liquefiable soil[C]//Ground Modiofication and Seismic Mitigation,ASCE.Shanghai,2006:379-386.
[4]Hiroko Suzuki,Kohji Tokimatsu,Masayoshi Sato,et al.Factor affecting horizontal subgrade reaction of piles dur-ing soil liquefaction and lateral spreading[C]//Seismic Performance and Simulation of Pile Foundations,ASCE.Davis,California,USA,2006:1-10.
[5]Shuji Tamura,Kohji Tokimatsu.Seismic earth pressure acting on embedded footing based on large-scale shaking table tests[C]//Seismic Performance and Simulation of Pile Foundations.Davis,California,USA,2006:83-96.
[6]冯士仑,王建华.饱和砂土中桩基的振动台试验[J].天津大学学报,2006,39(8):951-956.Feng Shilun,Wang Jianhua.Shaking table test on pile foundation in saturated sand[J].Journal of Tianjin Uni-versity,2006,39(8):951-956(in Chinese).
[7]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,Li Peizhen,et al.Comparative study on the dynamic soil-structure interaction system with various soils by using shaking table model tests[J].China Civil Engineering Journal,2006,39(5):57-64(in Chinese).
[8]Kagawa T,Sato M,Minowa,et al.Centrifuge simulations of large-scale shaking table tests:Case studies[J].Jour-nal of Geotechnical and Geoenvironmental Engineering,2004,130(7):663-672.
[9]陈国兴,庄海洋,程绍革,等.土-地铁隧道动力相互作用的大型振动台模型试验:试验方案设计[J].地震工程与工程震动,2006,26(6):178-183.Chen Guoxing,Zhuang Haiyang,Cheng Shaoge,et al.A large-scale shaking table test for dynamic soil-metro tun-nel interaction:Test scheme[J].Earthquake Engineering and Engineering Vibration,2006,26(6):178-183(in Chinese).
[10]杨林德,季倩倩,郑永来,等.地铁车站结构的振动台模型试验中模型箱设计的研究[J].岩土工程学报,2004,26(1):75-78.Yang Linde,Ji Qianqian,Zheng Yonglai,et al.Study on design of test box in shaking table test for subway station structure in soft soil[J].Chinese Journal of Geotechnical Engineering,2004,26(1):75-78(in Chinese).
[11]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].地震工程与工程震动,2000,20(4):30-36.Lou Menglin,Wang Wenjian,Zhu Tong,et al.Soil lateral boundary effect in shaking table model test of soil-structure system[J].Earthquake Engineering and Engi-neering Vibration,2000,20(4):30-36(in Chinese).
[12]姜忻良,徐炳伟.复杂结构-桩-土振动台模型试验数据分析[J].地震工程与工程震动,2009,29(6):170-175.Jiang Xinliang,Xu Bingwei.Data analysis of shaking ta-ble test studying complex structure-pile-soil interaction[J].Earthquake Engineering and Engineering Vibration,2009,29(6):170-175(in Chinese).
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