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首页> 美国政府科技报告 >QUAD-4: A Computer Program for Evaluating the Seismic Response of Soil Structures by Variable Damping Finite Element Procedures,
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QUAD-4: A Computer Program for Evaluating the Seismic Response of Soil Structures by Variable Damping Finite Element Procedures,

机译：QUaD-4：用可变阻尼有限元程序评估土壤结构地震响应的计算机程序，

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摘要

Using the finite element method to analyze the response of soil structures to seismic forces,it has been customary to employ a constant damping ratio for the entire finite element representation. The use of modal superposition in the solution has required the use of the same damping value for all elements. In fact,however,damping in soils is strain dependent,and the damping value to be used in each element should be based on the strain developed in that element. Furthermore,with irregular boundary conditions and variations in material properties,these strains may vary considerably. Thus,the use of a constant damping value,even though it may be the weighted average of the damping values for each element can lead to inaccurate results for some conditions. The formulation of a variable damping finite element procedure,its use in response evaluation and a listing of the computer program used in these evaluations are presented in this report. This procedure allows the incorporation of both stiffness and damping values,that are strain dependent,for each element.

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