自由场位移修正值R在地下结构抗震设计中的应用

Application of the Free Field Displacement Correction Value R in the Seismic Design of Underground Structures

地下结构抗震设计中,土和结构之间的相对位移普遍采用反应位移法和非线性动力时程分析法。但是反应位移法参数过多、求解过程繁琐,非线性动力时程分析法耗时较长,不利于设计工作者快速得到可靠设计参数。本文基于地铁结构抗震设计的案例,在传统设计方法之外,研究了一种简便计算方法,即通过自由场位移修正值R快速准确地计算出土和结构之间的相对位移,并将该方法与传统方法进行了对比,发现计算结果较接近,为地下结构的抗震设计提供了参考。

In the seismic design of underground structures,the response displacement method and nonlinear dynamic history analysis method are commonly used for the interaction of soil and structure.However,the re-sponse displacement method has too many parameters,the solution process is cumbersome,and the nonlinear dynamic history analysis method takes a long time,which is not conducive to the designers to quickly obtain re-liable design parameters.Based on the study of seismic design of subway structure,in addition to the traditional design method,an easy seismic deign method was developed.The relative displacement between the excavation and the structure was quickly calculated by the free field displacement correction value R,and the results were relatively close to the traditional method.The proposed method can be referenced for the underground structure in the seismic design.