群体涵洞地震易损性分析方法研究

Study on analysis method for seismic vulnerability of group culverts

提出涵洞与路段、桥梁、隧道等宜同为震害因子,参与研究区域内交通系统工程的震害预测。通过研究多种用于建立桥梁等构筑物地震易损性分析方法的理论基础,依据参与因子应具备兼容性原则,并基于四川汶川地震中公路涵洞的震害分析和破坏等级划分得出的结论,选取并论述用于涵洞易损性分析的震害影响因素的特点,给出分类应用说明。利用汶川地震中陇南公路总段所辖100道涵洞震害资料,采用最小二乘法原理,建立用于计算群体涵洞震害指数的统计回归模型;提出评价破坏等级的经验公式、建议系数值和临界值;结合路桥震害评估成果和实际经验给出二次评判方法和修正系数参考值。并采用SUV法进行该方法的适用性论证,提出方法的局限性和成因,给出方法改进建议。

The viewpoint of taking the culvert,road,bridge,tunnel,etc.as the earthquake damage factors and make them participate in the earthquake damage prediction of transportation system was proposed.Through studying theoretical basis of many seismic vulnerability methods for those structures such as bridges,the characteristics,classification and application of the factors were discussed according to the compatibility principle of the factors,analysis and classification of earthquake damage to highway culvert in Wenchuan earthquake.Based on the seismic damage documents of 100 culverts located in Longnan Highway due to the great 5.12 Wenchuan earthquake in Sichuan Province of China,a statistical regression model for calculating damage index of group culverts by using the least square method was established.The empirical formula,corresponding empirical coefficient and critical values for assessing earthquake damage were then determined.The twice-evaluation method and reference value of correction coefficient were suggested by combining the assessment results of the earthquake damage of road and bridge with practical experiences.The applicability of the proposed method was validated by the SUV method,the limitations of the proposed method and their causes were pointed out,and furthermore,the improvement suggestions were given.