【摘要】 为了分析材料耐久性劣化对结构抗震性能的影响,针对遭受氯离子侵蚀的钢筋混凝土连续刚构桥,提出在役桥梁结构的抗震性能评估方法。应用菲克第二定律,得到损伤混凝土、锈蚀钢筋力学性能随时间的衰减规律;应用Min概率分布函数,得到针对桥梁结构的地震危险性曲线方程;应用IDA增量动力分析法,得到损伤构件和结构整体的地震易损性曲线和风险性曲线,完成结构的抗震性能评估。研究结果表明:得到的材料耐久性损伤劣化规律易于工程应用;桥梁结构与建筑结构相比,地震危险性曲线公式相差一个常数0.301;在相同地震作用下,桥墩纵桥向的易损性大于横桥向,结构系统的易损性和风险性均大于构件;结构发生同等损伤程度的易损性和风险概率均随服役时间而增大。更多还原

【Abstract】 In order to analyze the effect of material durability deterioration on seismic performance of structure,with reinforced concrete continuous rigid frame bridge suffering chloride ion erosion as the research object,seismic performance evaluation method for bridges in service was proposed.With Fick’s Second Law,mechanical properties attenuation laws of damaged concrete and corroded reinforcement with time were got;with Min probability distribution function,the seismic hazard curve equation for bridge structure was got;with IDA incremental dynamic analysis method,seismic fragility curves and risk curves of members and the whole structure were obtained,and the seismic performance evaluation for the structure was completed.The results show that the obtained material durability damage and degradation laws are feasible for engineering application;compared with building structure,seismic hazard curve formula of bridge structure differs by a constant 0.301;under the same earthquake action,the transverse direction fragility of the pier is greater than the longitudinal direction fragility of the pier,and the fragility and risk probability of the structural system are greater than that of the components;and underthe condition of the same degree of damage,the structural fragility and risk probability both increase with service time.更多还原