桩土结构相互作用分析中土动力模型的修正

Modification of Soil Dynamic Constitutive Model in Pile-soil-structure Interaction Analysis

摘要:

提出桩土结构体系等效线性模型的修正方法.确定了近场区域的范围，并将该区域土的剪切模量乘以修正系数，得到修正等效线性模型.分析大量模型并求出相应修正系数，然后对所有修正系数进行回归分析，得到经验拟合算式.结果表明：强震作用下，土体采用等效线性模型能大幅提高桩土结构体系动力分析的精度.

关键词:桩土结构相互作用; 等效线性; 近场区域修正法; 动力响应

Abstract:

The modified method of equivalent linear model was proposed when performing pile-soil-structure interaction. The dimension of near region was solved and the modified equivalent linear model was obtained. Then, the extensive numbers of the models were analyzed and the modified parameters were solved. Finally, the regression analysis was performed to obtain the empirical equation based on the extensive modified parameters. It is shown that the accuracy of pilesoilstructure interaction analysis under strong earthquake is improved with the modified method.

Key words:pile-soil-structure interaction; equivalent linear; nearfield modification method; dynamic response