土-桩-结构振动台模型试验相似理论及其实施  

Similitude laws and its application in shaking table test of soil-pile-structure interaction system

作　　者：姜忻良[1,2] 徐炳伟[1] 李竹[3] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津市土木工程结构及新材料重点实验室,天津300072 [3]天津城投建设有限公司,天津300010

出　　处：《振动工程学报》2010年第2期225-229,共5页Journal of Vibration Engineering

基　　金：国家自然科学基金重大研究计划项目(90815025);国家自然科学基金项目(50878143);天津市重大科技项目(07FDZDSF01200)

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 soil-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.

关 键 词：土-桩-结构 振动台试验 卓越周期相似比 完全相似 部分相似 

分 类 号：TU435[建筑科学—岩土工程] TU352.1[建筑科学—土工工程]