Abstract In service period, the key to ensure the service performance of bridge is to control its material durability damage and continuous collapse better. Nowadays, most anti - collapse analysis under earthquake is for the frame structure, the theory and method of anti - collapse analysis of bridge is not systematically summarized. Taking a 4 - span rigid frame - continuous girder bridge in offshore seismic prone region as an example, a new quantitative criterion for collapse resistance was proposed based on theoretical fragility, reliability theory and concept removal method of components, which is suitable for the example bridge. The results show that the time-varying durability damage and time-varying bond - slip effect on mechanical properties of materials can't be ignored in service period; the fragility and importance coefficient increase with service life, while the robustness coefficient decreases with service life, the different optimization algorithms all improve their corresponding parameters; when the bridge reaches its designed service life, its robustness coefficient is about 25% of that of the new, when the bridge exceeds the designed service life, its robustness coefficient decay rate is low, and the residual robustness coefficient is about 18%, the bridge still has certain anti - collapse performance.

中文翻译：

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基于时变易损性的海上刚架抗倒塌分析-连续梁桥

摘要 在使用期间，保证桥梁使用性能的关键是更好地控制其材料耐久性破坏和连续倒塌。目前，地震作用下的抗倒塌分析大多是针对框架结构的，桥梁抗倒塌分析的理论和方法还没有系统地总结。以某海上地震多发区4跨刚构-连续梁桥为例，基于易损性理论、可靠性理论和构件概念去除方法，提出了一种新的抗倒塌量化准则，适用于该实例桥梁。 . 结果表明，材料的时变耐久性损伤和时变粘结滑移对材料力学性能的影响在使用期内是不可忽视的；脆弱性和重要性系数随着使用寿命的增加而增加，而鲁棒性系数随着使用寿命的增加而减小，不同的优化算法都改进了其相应的参数；当桥梁达到设计使用寿命时，其鲁棒系数约为新桥的25%，超过设计使用寿命时，其鲁棒系数衰减率较低，剩余鲁棒系数约为18%，桥梁仍有一定的抗倒塌性能。