隧道纵向地震反应分析的反应位移法对比

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Abstract Aiming at longitudinal seismic response problems of underground tunnel structures, the longitudinal response displacement method is suggested by the “Code for aseismic design of urban rail transit structures”.This approach takes the soil-structure interaction into consideration to a certain extent.Here, the longitudinal overall response displacement method was introduced, and it was a kind of the pseudo-static method for seismic response analysis of linear underground structures under non-uniform seismic input.Taking a certain shield tunnel in Beijing as the study object, the specification method and the proposed method were adopted, respectively to perform its longitudinal seismic response computation under SH wave oblique incidence.The results were compared with those using the dynamic time-history method.The results indicated that discrete foundation springs in the computation model of the specification method can’t reflect interactions among ground soil bodies to possibly cause larger errors of internal forces mainly containing shear forces; if assuming the longitudinal soil layer displacement distribution be a sinusoidal wave mode in the specification method, due to the sinusoidal wave mode being inconsistent with real situation, so the computation results of internal forces are too different from those of the dynamic time history method; if taking the free-field displacement time-history as the equivalent seismic action in the specification method, the computed maximum bending moments have good computation accuracy, but the computed maximum shear forces are too different from those of the dynamic time history method, the specification method needs to complete static forces computation in all time steps and then can obtain the most unfavorable seismic response, so its computation efficiency is poor; while the proposed method can effectively simulate constraint action of ground soil on the tunnel structure, it can be easy and simple to determine the time instant of the unfavorable structural seismic response, and it has a good computation accuracy, a higher computation efficiency to reflect the effects of non-uniform ground motion input on a tunnel’s longitudinal seismic responses under the action of seismic waves.

Key words： tunnel structure longitudinal seismic response response deformation method integral response deformation method asynchronous seismic wave input

Received: 17 May 2018 Published: 28 October 2019

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	LIU Jingbo
	WANG Dongyang
	TAN Hui
	BAO Xin

Cite this article:

LIU Jingbo,WANG Dongyang,TAN Hui, et al. Response displacement methods for longitudinal seismic response analysis of tunnel structures[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(21): 104-111.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I21/104

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