【摘要】 防止地震作用下结构倒塌是基于性能的地震工程的核心目标,目前基于弹塑性时程分析的倒塌易损性分析是结构抗倒塌能力评价最合理的方法.倒塌易损性分析的关键之一是建立合理的倒塌判别准则,文中提出了超高墩刚构桥地震倒塌破坏的判别准则.结合某工程实例,基于OpenS-ees建立了结构的非线性分析模型,对其进行了非线性地震时程分析,在此基础上建立了结构的易损性曲线,并讨论了混凝土保护层剥落和钢筋锈蚀等结构劣化对倒塌易损性的影响.更多还原

【Abstract】 An important goal of performance-based seismic design is to prevent collapse of bridges.At present collapse fragility analysis based on the elasto-plastic time-history calculation is the most reasonable method to evaluate the collapse ability.The collapse criterion is the most important problem to be resolved.In this paper,a criterion of collapse for rigid frame bridge with high piers is proposed.An engineering example is demonstrated to study the collapse fragility of a rigid frame bridge with super high piers.The structure model is establish by OpenSees and the nonlinear time-history calculation is carried out to obtain the collapse fragility.Also the effect of deterioration,such as concrete spalling,the decreasing of strength and area of reinforcement,on the collapse fragility is discussed in detail.更多还原