隧道结构抗震时程分析

Analysis on Seismic Time History of Tunnel Structure

摘要:

为研究隧道结构在地震作用下的受力和变形特性，结合苏州市春申湖隧道工程，采用Midas GTS有限元分析软件建立三维模型进行时程分析。研究结果表明，E2地震作用下，结构最大弯矩出现在主线顶板，截面抗弯配筋由静力工况下的裂缝控制，隧道结构侧墙易处于高轴压比工作状态。隧道结构侧墙为抗震关键构件，设计时应注意控制轴压比使侧墙在地震作用不发生脆性破坏。E3地震作用下，为保证地下结构在震后可修复，弹塑性变形能力极限状态的验算最大层间位移角均满足抗震性能的要求，结构处于弹塑性工作阶段。

Abstract:

In order to study the stress and deformation of tunnel structure under earthquake, in combination with Suzhou Chunshen Lake Tunnel Project, a three-dimensional model is established by using Midas GTS finite element numerical software to carry out the time history analyze. The study results show that the maximum bending moment of the structure under E2 earthquake occurs at the top plate of the main line. The section flexural reinforcement is controlled by cracks under static conditions. The side wall of tunnel structure is easy to be in the working state of high axial compression ratio, which is a key component of earthquake resistance. During design, the attention should be paid to controlling the axial compression ratio to prevent the side wall from brittle failure under earthquake. Under the action of E3 earthquake, in order to ensure the underground structure able to be repaired after the earthquake, the maximum inter-layer displacement angle calculated in the limit state of elastoplastic deformation capacity meets the requirements of seismic performance. And the structure is in the elastoplastic working stage.