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MODIFICATION OF SITE RESPONSE IN PRESENCE OF LOCALISED SOFT LAYER

机译:局部软层存在下站点响应的修改

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摘要

Experimental and numerical simulations are performed to evaluate the modification of ground response resulting from either the presence of soft layers or occurrence of partial liquefaction. Results from two densely instrumented dynamic centrifuge tests are presented to show the ambiguous role played by the presence of a soft layer. It was found that the lateral extent of the soft layer has significant influence on the overall response of the layered strata and any structure founded on it. The experimental observations are supported by simplified numerical analysis. The amplification or deamplification of the input motion is found to be a function of the ratio of the width of soft layer to the wave length. Based on the numerical analysis, a general function describing the site amplification is presented which may be used as a guide in seismic design of foundations in such layered strata.
机译:进行实验和数值模拟以评估由于存在软层或部分液化而引起的地面响应的变化。两项密集仪器的动态离心机测试结果显示了软层的存在对模棱两可的作用。已经发现,软层的横向范围对分层地层及其上建立的任何结构的整体响应具有显着影响。实验观察得到简化数值分析的支持。发现输入运动的放大或去放大是软层的宽度与波长之比的函数。在数值分析的基础上,提出了描述场地放大作用的通用函数,可以作为此类分层地基抗震设计的指导。

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