研究发现汶川地震Ⅵ度区和Ⅶ度区内公路桥梁震害调查数据相对于更高烈度区的调查情况不够全面详实，特别是完好桥梁的数据偏少，因此，基于这些原始调查数据生成的经验易损性曲线就会和实际的地震易损性有偏差。针对这一问题，本文利用高烈度区域内桥梁调查数量与烈度区分布面积的比例关系对低烈度区域的桥梁调查数量进行了补充。基于补充后的桥梁震害数据，得到了汶川地震公路桥梁的经验易损性曲线，并分析了桥型和桥梁规模对易损性的影响。
Abstract
Through the research on seismic damage of highway bridges in the Wenchuan Earthquake,it is found that the survey data of highway bridges in low intensity regions (Ⅵ degree and Ⅶ degree) is less detailed than that of high intensity regions,especially lacking of records of bridges with no damage. In this way,the empirical fragility curves generated based the original survey damage data are not reliable. To solve this problem,the survey quantity of highway bridges in low intensity regions was approximately supplemented,with the proportion between its counterparts in high intensity regions and the corresponding intensity areas. Based on the complemented seismic damage data,the empirical fragility curves of highway bridges in the Wenchuan Earthquake were developed. Furthermore,the effects of bridge type and bridge size on the vulnerability were analyzed respectively.
关键词
汶川地震 /
公路桥梁 /
经验易损性曲线 /
极大似然估计 /
拟合优度检验
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Key words
Wenchuan Earthquake /
highway bridges /
empirical fragility curves /
maximum likelihood method /
goodness of fit test
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