场地土-群桩基础-结构体系动力响应研究——大型振动台系列试验方案设计

以饱和砂土液化后场地失效模式特征与场地失效时群桩基础地震反应破坏机理为研究目的,依托中国建筑科学研究院大型模拟地震振动台系统,开展可液化场地、非液化场地在水平地震动激励下桩-土-结构动力相互作用动力体系大型振动台系列试验。基于本次系列试验研究对象以及试验目的,阐述了系列试验中动力模型体系相似比设计的基本原则、地基的制备、模型结构制作、各个种类传感器的选择与布设、输入地震记录的选取与工况安排等内容,介绍了阵列式位移计、非接触式位移动态采集系统等新型传感测试设备,并对所采用的层状单向剪切模型土箱设计合理性与科学性进行了验证。由之后的试验结果可知,本次系列试验设计方案是合理、可靠的,层状剪切模型箱的"模型箱效应"很小。

Experimental Study on Seismic Response of Superstructure-piles-soil SystemDesign of Test Plan for Large -scale Shaking Table Model Experiments

To study on the failure model of sites after sand liquefaction and the failure mechanismof seismic response of piles foundation, and relying on the Large- -scale Simulated Seismic ShakingTable System of China Academy of Architectural Sciences, liquefiable and non- liquefiable siteslarge- scale shaking table tests of piles- soil-structure dynamic interaction system under horizontalearthquake excitation were carried out. According to the research objective and purpose of thisseries of large-scale shaking table tests, this paper expounds the basic principles of similarity ratio design of dynamic model system in the test series, preparation of the sites, design of modelstructures, selection and arrangement of various sensors, input seismic records and the load e-vents. The new sensor testing instruments, such as the Shape Acceleration Array, and the non-contact displacement measuring system, are introduced. Besides, the rationality and scientific na-ture of the soil box for laminar and one-direction shear tests have been verified.