基于能力曲线的燃气系统地震脆弱性评估方法

Vulnerability Assessment Method of Natural Gas System in Seism Based on Capacity Curve

为了定量评估燃气系统在地震中的脆弱性水平,基于能力——需求谱方法建立了燃气系统地震脆弱性评估方法。评估方法从地震潜在危险性分析、结构抗震能力、需求谱与脆弱性曲线建立以及破坏状态预测等四方面着手研究。基于上述模型与方法,研究了地震动作用下燃气系统最大承载能力、破坏等级及概率。最后以某天然气压缩站主体建筑为例,建立了反映场地地震潜在危险性的地震反应谱,构建了用于确定性能点的抗震能力——需求谱,并基于FEMA 273绘制了不同破坏等级的脆弱性曲线,定量分析了该压缩站遭受破坏等级和概率。

In order to assess the vulnerability level of natural gas supply system in seism quantitatively,assessment method of vulnerability level is investigated based on capacity-demand spectrum.Study works are done from 4 aspects including potential earthquake hazard analysis,capacity-demand spectrum of the natural gas supply system,vulnerability curves and forecast method for the destruction state.On this basis,maximum carrying capacity and probabilities of specific damage levels in the role of ground motion parameters are studied.Finally,take for example the main structure of a natural gas compressor station,seismic response spectrum is established to analyze the potential earthquake risk,capacity-demand spectrum is constructed to determine the seismic performance point,vulnerability curves of the corresponding destruction states for this type of natural gas compressor stations is drew based on the FEMA 273,the level and the possibilities of destruction level is calculated quantitatively.