地下综合管廊结构的易损性分析

Vulnerability Analysis of Underground Utility Tunnel

地下综合管廊结构在工作过程中可能受到不同强度的地震动作用。研究在不同强度的地震动作用下地下综合管廊结构的易损性问题。根据混凝土材料在单轴受压状态下的应力-应变曲线提出混凝土破坏的4个性能水平。以非线性动力分析为基础,通过多条随机地震动的输入得到管廊结构的地震响应时程数据,以重要节点的位移响应作为管廊结构的性能参数,建立结构性能参数与地震动强度指标之间的关系。根据概率地震需求分析方法对管廊结构进行基于性能参数的易损性分析并绘制管廊结构的地震易损性曲线,对管廊结构的抗震性能进行评估分析。

The structure of underground utility tunnel may be subjected to earthquakes of different intensity during the working process. The vulnerability of underground utility tunnel under earthquake was analyzed in this paper.Four performance levels of concrete damage were proposed based on the stress-strain curve of concrete materials under uniaxial compression. On the basis of nonlinear dynamic analysis,the data of seismic response in every load step was obtained through multiple random seismic inputting. Taking the displacement of important nodes as the performance parameter of the utility tunnel,the relationship between performance parameter of tunnel and strength of earthquake was established. Through the probabilistic seismic demand analysis,the vulnerability analysis of utility tunnel based on performance parameters is carried out,and the fragility curves were drawn to evaluate the seismic performance of utility tunnel.