基于不同破坏指数的建筑物震害预测不确定性分析

结构地震破坏指数是将结构地震破坏程度进行量化的指标,其应用领域十分广泛。本文针对建筑结构震害预测工作,选取了7种典型的破坏指数,分别以5层和17层钢筋混凝土结构为模型,计算了在给定地震动作用下,结构模型对应于每个破坏指数的结构震害等级。计算结果表明:由于选取的破坏指数以及相应的破坏等级划分不同,建筑物的震害预测结果会存在较大的差异,尤其在接近设防烈度的地震作用下,建筑物的震害预测结果存在很大的不确定性。

Study on Uncertainty of Earthquake Damage Prediction Based on RC Structural Damage Indices

The earthquake damage indices of structure,which are quantifying indicators of the degree of structural damage caused by earthquake,have found applications in wide fields.Aiming at the practice of damage prediction of buildings,seven typical damage indices were selected firstly in this paper.And then a five-story and a seventeen-story reinforced concrete structures were modeled,whose damage grades corresponding to each selected damage index were calculated under the input of given earthquake ground motions.The results show that due to the difference of the pre-selected damage index as well as the scaling of damage grade corresponding to each index,there exits a relatively great variance in the results of seismic damage prediction of building,especially in the case of seismic excitation whose intensity is close to the design intensity of building,where the damage prediction results of building present large uncertainty.