不同地震下的校园建筑震害与经济损失对比

COMPARISON OF SEISMIC DAMAGE AND ECONOMIC LOSS OF CAMPUS BUILDINGS UNDER DIFFERENT EARTHQUAKES

城市抗震弹塑性分析方法广泛地应用于地震灾害分析领域,其将强震记录输入目标区域建筑模型进行非线性时程分析,得到目标区域的建筑破坏情况。然而,不同地震的目标区域各不相同,难以对比不同地震的破坏能力。因此,该文以清华校园作为目标区域,将若干条近年来的强震记录和2组模拟地震动输入校园建筑进行分析,对比不同地震下建筑的破坏状态比例,从结果可以看出地震动频谱特性对于目标区域建筑破坏状态具有较大影响。此外,该文分别利用基于FEMA P-58的方法和基于中国规范的方法对上述地震下的校园建筑进行了经济损失评价,结果表明由于计算方法差异两种方法结果有所不同,且结果受到地震动峰值加速度(PGA)影响。该文的分析结果可以为对比不同地震的破坏能力提供参考。

The city-scale nonlinear time-history analysis is widely used in the field of seismic analysis.Strong ground motion records are input into the building models of a target region for nonlinear time-history analyses to obtain damage of the buildings.However,different earthquakes have different target regions,which makes it difficult to compare the destructive capacities of different earthquakes.In this work,the damage state ratios of buildings in the campus of Tsinghua University under different earthquakes are compared using several strong ground motion records in recent years and two artificial ground motions.The results indicate that the spectral characteristics of ground motions have a great influence on the damage states of buildings in the target region.The economic loss under the earthquakes are also evaluated using the method based on FEMA P-58 and the method based on the Chinese code,respectively.The results show that the two methods have different results due to their different computing theories.Peak ground accelerations(PGAs)have some effects on the results of economic loss evaluation.The analysis results can provide a reference for the comparison of the destructive capacity of different earthquakes.