土-桩-结构振动台模型试验相似理论及其实施
|
摘要
通过分析动剪切模量G的表达形式及其相似比推导,发现由于影响土Gmax和G/Gmax-γ的因素较多,要确立土的剪切模量相似比并使土与桩-结构的模量和密度相似比同时匹配非常困难,即难以使土-桩-结构体系模型与原型之间做到完全相似。根据场地土的卓越周期是结构地震反应的主要因素,提出了采用土的卓越周期相似比设计模型土的方法,并实际应用于土-桩-结构振动台模型试验相似设计中。试验结果表明:应用土的卓越周期相似比设计模型土,保留了原场地土的主要特性,使模型与原型部分相似,这种方法应用在土-桩-结构振动台模型试验相似设计中是合理的。
Based on the analysis extensively on the formulas of the dynamic shear modulus G and the results of the similitude ratio,it shows that there are many factors that have influences on soil's Gmax and G/Gmax-γ curve,therefore it is very difficult to establish the similitude ratio of soil's shear modulus and it is also very difficult to make the similitude ratio of soil's shear modulus and the density similitude ratio both match with the pile-structure's.Thus,it is hard to make the model completely similar to the prototype of soil-pile-structure interaction system.According to the fact that the soil's predominant period is the major factor influencing structure's seismic response,it is proposed to adopt the similitude ratio of soil's predominant period to design model soil and to apply it to similitude design of shaking table test of soil-pile-structure interaction system.The test results show that designing through this method the model soil can maintain the major property of in-situ soil,which enables partial similitude between the model and the prototype of soli-pile-structure interaction system.It is concluded the proposed method is suitable for similitude design of shaking table test of soil-pile-structure interaction system.
Based on the analysis extensively on the formulas of the dynamic shear modulus G and the results of the similitude ratio,it shows that there are many factors that have influences on soil's Gmax and G/Gmax-γ curve,therefore it is very difficult to establish the similitude ratio of soil's shear modulus and it is also very difficult to make the similitude ratio of soil's shear modulus and the density similitude ratio both match with the pile-structure's.Thus,it is hard to make the model completely similar to the prototype of soil-pile-structure interaction system.According to the fact that the soil's predominant period is the major factor influencing structure's seismic response,it is proposed to adopt the similitude ratio of soil's predominant period to design model soil and to apply it to similitude design of shaking table test of soil-pile-structure interaction system.The test results show that designing through this method the model soil can maintain the major property of in-situ soil,which enables partial similitude between the model and the prototype of soli-pile-structure interaction system.It is concluded the proposed method is suitable for similitude design of shaking table test of soil-pile-structure interaction system.
引文
[1]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73—84.
[2]Kagawa T,Sato M,Minowa C,et al.Centrifugesimulations of large-scale shaking table tests:casestudies[J].Journal of Geotechnical and Geo-environ-mental Engineering,2004,130(7):663—672.
[3]陈国兴,庄海洋,杜修力,等.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(2):171—176.
[4]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.
[5]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77—82.
[6]迟世春,林少书.结构动力模型试验相似理论及其验证[J].世界地震工程,2004,20(4):11—20.
[7]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.
[8]季倩倩.地铁车站结构振动台模型试验研究[D].上海:同济大学,2002.
[9]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2003.
[10]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.
[11]程国勇,张立,王建华.用扭剪波测试土样剪切波速的新技术[J].岩土工程学报,2005,27(3):358—359.
[12]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.
[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].地震工程与工程震动,2006,26(4):199—204.
[2]Kagawa T,Sato M,Minowa C,et al.Centrifugesimulations of large-scale shaking table tests:casestudies[J].Journal of Geotechnical and Geo-environ-mental Engineering,2004,130(7):663—672.
[3]陈国兴,庄海洋,杜修力,等.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(2):171—176.
[4]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.
[5]武思宇,宋二祥,刘华北,等.刚性桩复合地基抗震性能的振动台试验研究[J].岩土力学,2007,28(1):77—82.
[6]迟世春,林少书.结构动力模型试验相似理论及其验证[J].世界地震工程,2004,20(4):11—20.
[7]庄海洋.土-地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.
[8]季倩倩.地铁车站结构振动台模型试验研究[D].上海:同济大学,2002.
[9]钱家欢,殷宗泽.土工原理与计算[M].北京:中国水利水电出版社,2003.
[10]陈仲颐,周景星,王洪瑾.土力学[M].北京:清华大学出版社,1994.
[11]程国勇,张立,王建华.用扭剪波测试土样剪切波速的新技术[J].岩土工程学报,2005,27(3):358—359.
[12]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.
[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].地震工程与工程震动,2006,26(4):199—204.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心