软土-铰接桩体系隔震性能的振动台试验研究
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摘要
设计并实现了软土-铰接桩体系隔震性能的振动台试验,通过试验研究了这种新型隔震体系对上部结构动力反应的影响。本试验采用块状海绵作为模型土,并采用两端铰接的新型群桩基础,以模拟剪切模量较小的软土地基。此外,采用振型分解法的计算机程序对试验模型进行了计算。研究结果表明,软土地基情况下结构的自振周期远大于刚性地基上结构的自振周期,软土地基情况下的结构阻尼远大于刚性地基情况下的结构阻尼,结构的地震反应有所减小,加速度反应减幅达到40%以上。这说明这种新型的软土地基起到了隔震减震的作用。所提出的软土-铰接桩体系,是地基-基础-上部结构动力相互作用的发展与应用。
Shaking table model tests of shock insulation by soft soil-hinged pier system are designed and carried out.By the testing,the effects of this new system on the earthquake response of structure were analyzed.The sponge and the pile foundation with hinges on both ends were adopted in this test to imitate the soft soil with small shear modulus.The earthquake reaction of Soil-Structure-Interaction system was calculated by a program of modal analysis method.The results show that the natural period of the structure on rigid foundation is much longer than that on soft soil founda-tion,and that the damping is much larger too.The earthquake response of the structure is reduced and the ratio reach-es 40%.It means that the soft soil foundation has the impact on shock absorption and isolation.The soft soil-hinged pier system is the development and application of the soil-foundation-structure interaction.
Shaking table model tests of shock insulation by soft soil-hinged pier system are designed and carried out.By the testing,the effects of this new system on the earthquake response of structure were analyzed.The sponge and the pile foundation with hinges on both ends were adopted in this test to imitate the soft soil with small shear modulus.The earthquake reaction of Soil-Structure-Interaction system was calculated by a program of modal analysis method.The results show that the natural period of the structure on rigid foundation is much longer than that on soft soil founda-tion,and that the damping is much larger too.The earthquake response of the structure is reduced and the ratio reach-es 40%.It means that the soft soil foundation has the impact on shock absorption and isolation.The soft soil-hinged pier system is the development and application of the soil-foundation-structure interaction.
引文
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[2]彭轶君,尚守平,朱志辉,等.有限元模拟土-箱基-框架结构大比例模型动力相互作用研究[J].铁道科学与工程学报,2006,3(1):75-79.PENG Yi-jun,SHANG Shou-ping,ZHU Zhi-hui,et al.FEM study on dynamic interaction of soil-box foundation-frame structure[J].Journal of Railway Science and Engineer-ing,2006,3(1):75-79.
[3]吕西林,陈跃庆,陈波,等.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2002,20(4):20-29.L.U.Xi-lin,CHEN Yue-qing,CHEN Bo,et al.Shaking tabletesting of dynamic soil-structure interaction system[J].Earthquake Engineering and Structural Dynamics,2002,20(4):20-29.
[4]吕西林,陈跃庆.高层建筑结构-地基动力相互作用效果的振动台试验对比研究[J].地震工程与工程振动,2002,22(2):42-48.L.U.Xi-lin,CHEN Yue-qing.Study on effect of soil-struc-ture interaction by shaking table test[J].Earthquake Engi-neering and Structural Dynamics.2002,22(2):22-48.
[5]蒋建国,周绪红,邹银生,等.土-结构动力相互作用研究的发展历程及展望[J].岩土工程界,2001,4(6),47-49.JIANG Jian-guo,ZHOU Xu-hong,ZOU Yin-sheng,et al.Devalopment and prospect of soil-structure dynamic interac-tion[J].Geotechnical Engineering World,2001(6):47-49.
[6]陈国兴,王志华,宰金珉.考虑土与结构相互作用效应的结构减震控制大型振动台模型试验研究[J].地震工程与工程振动,2001,21(4):117-127.CHEN Guo-xing,WANG Zhi-hua,ZAI Jin-min.Shakingtable model of structure suppressing vibration control includingsoil-structure interaction effect[J].Earthquake Engineeringand Structural Dynamics,2001,21(4):117-127.
[7]陈跃庆,吕西林.分层土-基础-高层框架结构相互作用体系振动台模型试验研究[J].地震工程与工程振动,2001,21(3):104-112.CHEN Yue-qing,L.U.Xi-lin.Shaking table testing for lay-ered soil-foundation-structure interaction system[J].Earthquake Engineering and Structural Dynamics,2001,21(3):104-112.
[8]邱法维,钱稼茹,陈志鹏.结构抗震试验方法[M].北京:科学出版社,2000.QIU Fa-wei,QIAN Jia-ru,CHEN Zhi-peng.Testing methodsof aseismatic structure[M].Beijing:Science Press,2000.
[9]Wolf J P.Dynamic soil-structure interaction[M].北京:地震出版社,1989.Wolf J P.Dynamic soil-structure interaction[M].Beijing:Geology Press,1989.
[10]尚守平,王海东.钢筋混凝土框架与桩筏基础及地基动力相互作用大比例模型试验[C]∥第十八届全国高层建筑结构学术会议论文集.北京:中国建筑科学研究院,2004:908-913.SHANG Shou-ping,WANG Hai-dong.Experimentation ofreinforcded concrete large-scale frame of pile-raft founda-tion considering SSI[C]∥Dissertation in 18th Conferenceon Tall Building Structure.Beijing:China Academy ofBuilding Research,2004:908-913.
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