临近重要建筑物的地下结构抗震时程分析

Finite Element Seismic Analysis by Time-History Method between Metro Tunnel and Existing Buildings

针对沈阳地铁四号线某临近重要建筑物区间,本文采用弹性有限元时程分析的方法对地铁结构进行抗震分析,得到设防烈度情况下地铁暗挖结构、明挖结构最大主应力、最小主应力及水平相对位移的时程曲线,分析地震作用对临近建筑物的地铁区间安全运营的影响。分析结果表明:结构的最大主应力及最小主应力均小于隧道结构混凝土的设计强度;结构整体变形近似线性变化,结构传力途径简捷、明确,无结构薄弱部分,区间结构满足抗震设计要求。

Considering the effect on one of the metro tunnel close to some important buildings in Shenyang Line 4,in this paper,the elastic time-history method was used to analyze the effect on the metro tunnel structure during the aseismatic design in running period.The time history curve in the seismic fortification intensity case of the maximum principal stress,the minimum principal stress,as well as the relative horizontal displacement of the open-cut and bored structures were obtained.On this basis,this paper analyzed the seismic action affect between the metro tunnel in running period and important buildings nearby.It showed that the maximum principal stress and the minimum principal stress were far less than the the design strength of the metro structures and the whole structural deformation had a linear change during the defending earthquake.The structures presented a terse and clear bearing behavior without any weak portion.Hence,the metro tunnel structures met the requirements of Aseismatic Design Code of China.