基于模糊层次分析法的公路梁式桥地震震害预测研究

收集整理了我国汶川、唐山、海城等大地震中6度至11度区遭受不同程度震害的240座公路梁式桥样本,建立了公路梁式桥震害数据库.采用模糊层次分析法,对影响桥梁震害的主要因素进行层次分析,明确各因素对结构震害的影响程度,建立震害评估模型.根据震害样本统计结果,确定各层影响因素的模糊评语矩阵与模糊判断矩阵,进而对公路梁式桥在特定地震作用下可能出现的破坏情况进行预测.经算例验证,基于模糊层次分析法的公路梁式桥震害预测方法可获得较好的预测结果,可为此类桥梁的抗震加固提供设计依据.

The research on the earthquake damage prediction of highway girder bridges based on fuzzy analytical hierarchy approach

The database of earthquake damage for highway girder bridges was established. The range of intensity from 6 degree to 11 degree, and the number sample is 240 highway girder bridges collected from Wenchuan, Tangshan, and Haicheng earthquake, etc. Fuzzy hierarchy analysis approach was employed to establish the damage assessment model based on classified the main effect factors and confirmed the incidence of them. Fuzzy evaluation matrix and fuzzy judgement matrix of different level factors were formed based on the statistic results, and then the damage under some earthquake of highway girder bridges can be forecasted. The research conclusion has been verified by two examples and it can be seen as the design basis for seismic reinforcement for such bridges.