地下预制管廊纵断面抗震设计的反应位移法

Response deformation method of longitudinal-section seismic analysis of underground precast utility tunnel

基于横断面反应位移法的基本原理,提出了地下预制管廊纵断面抗震设计的一个反应位移法。通过对地下管廊在地震作用下发生沿纵断面层间变形时的地震响应进行研究,将地下管廊对应土体发生最大相对位移时刻作为最不利时刻,并将该时刻的土体地震响应施加于管廊作为地震作用输入。文中采用该方法研究了地震作用下单层和双层地下预制管廊的纵断面抗震性能。结果表明,地下预制管廊结构沿纵断面发生层间变形时,可能发生较为严重的受拉损伤,且受拉损伤严重区域大多出现在侧墙和中隔板位置处,抗震设计时可考虑加强侧墙和中隔板位置处的配筋。研究方法对地下预制管廊纵断面抗震设计具有参考价值。

Based on the theory of traditional cross-section response deformation method,a response deformation method is proposed to calculate the longitudinal-section seismic response of underground precast utility tunnel.This method is used to study the seismic response of underground precast utility tunnel when shear deformation occurs along longitudinal-section under earthquake action,taking the moment of the maximum relative displacement of soil as the most unfavorable moment,and the seismic response of soil at this moment is applied to the structure as the seismic input.This method is used to study the longitudinal-sectional seismic performance of single-layer and double-layer underground precast utility tunnel under earthquake actions.It is shown that,there is the risk of serious tensile damage for underground precast utility tunnel,the damage mostly occurs in the side wall and the middle partition,and the reinforcement of side wall and middle partition should be emphasized.The method has important reference value for the longitudinal-section seismic analysis of underground precast utility tunnel.