体育馆地震易损性分析及抗震韧性评估

SEISMIC FRAGILITY ANALYSIS AND RESILIENCE EVALUATION OF GYMNASIUM

  • 摘要: 我国是世界上地震灾害最严重的国家之一,而体育馆常用作震后应急避难场所,对其进行抗震韧性评估具有重要意义。本文采用SAP2000建立了某体育馆分析模型,采用增量动力分析法对其主体钢混框架、屋盖空间桁架结构进行易损性分析,根据串联系统可靠度理论分析了体育馆在不同地震强度下破坏概率;提出了基于期望标准差的修复费用、修复时间计算方法及建筑震后恢复模型,建立了多种修复路径下体育馆抗震韧性曲线。研究结果表明:地震强度逐渐增大时体育馆主体框架及连接主体框架与屋盖桁架的支座最先发生破坏。结构构件及楼梯修复所需的时间比其他非结构构件更长。除连接于屋盖的非结构构件外,各层修复时间随楼层所在高度的增加而增长。地震强度增大时建筑韧性曲线中各楼层对应功能提升量及修复时间并不以相同比例变化,资源约束条件下按修复效率从高到低修复时建筑功能提升最快。

     

    Abstract: China is one of the most earthquake-damaged countries in the world. As gymnasiums are often used as emergency shelters after earthquakes, evaluating their seismic resilience is significant. In this study, the analysis model of a gymnasium is established by SAP2000. The incremental dynamic analysis method is applied to analyze the fragility of reinforced concrete frames and spatial steel truss structures. According to the reliability theory of the series system, the failure probability of the gymnasium after different earthquake intensities is acquired. Proposed are the calculation method of repair cost and time based on expected value and standard deviation and, one building post-earthquake recovery model. Then the seismic resilience curves of gymnasium under various repair paths are established. The analysis results show that the main frame and the bearing connecting main frame and space truss are destroyed first, when the seismic intensity increases gradually. The repair time of structural members and stairs in each floor is longer. Except for the non-structural members connected to the roof, and the repair time of each floor increases with the increase of the height of the floor. When the seismic intensity increases, the function improvement and repair time of each floor in the building resilience curve do not change in the same proportion. Under the resource constraints, the building function improves the fastest when it is repaired as the repair efficiency is from high to low.w.

     

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