The influence of the near-fault ground motion on the response of long-span bridges must be considered as a critical factor for seismic design because the response indicates different aspects from existing earthquake characteristics. Also, it is important to note that the safety index for the risk assessment of long-span bridges is determined based on the minimum expected life-cycle cost E(LCC). In this study, earthquake characteristics are analyzed by creating elastic and inelastic response spectrums with actual measurement records (Chi-Chi earthquake records) and then the numerical analysis of the long-span bridge in Namhae, Korea is performed according to the increase and reduction of the member stiffness based on the standard design., the reliability evaluation of the long-span bridge considering aleatory uncertainties is performed on the basis of the combined results of static analysis and seismic response analysis. Also, the minimum LCC is estimated based on failure probabilities by the different alternative design. Because of epistemic uncertainties, the results of reliability evaluation and the LCC of optimal design are selected as random variables; the safety index, failure probability and expected minimum LCC are re-evaluated with regard to critical percentage values for a risk-averse design of the long-span bridge, and are presented graphically using cumulative percentages. It is, therefore, expected that this study will provide the basic information for the risk assessment and optimal design method in performing seismic design of the long-span bridge considering earthquake characteristics.

中文翻译：

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考虑生命周期成本概念和近断层地震动影响的大跨度桥梁风险评估

必须将近断层地震动对大跨度桥梁响应的影响视为地震设计的关键因素，因为该响应表明与现有地震特征不同的方面。同样，重要的是要注意，大跨度桥梁风险评估的安全指数是根据最小预期生命周期成本E（LCC）确定的。在这项研究中，通过创建具有实际测量记录（Chi-Chi地震记录）的弹性和非弹性响应谱来分析地震特征，然后根据韩国南海的大跨度桥梁进行数值分析。基于标准设计的构件刚度，在静态分析和地震反应分析相结合的结果的基础上，对考虑不确定性的大跨度桥梁进行了可靠性评估。同样，最小LCC是根据故障概率通过不同的替代设计估算的。由于不确定性，选择可靠性评估的结果和最优设计的LCC作为随机变量。针对大跨度桥梁风险规避设计的关键百分比值，重新评估了安全指数，失效概率和预期的最低LCC，并使用累积百分比以图形方式显示。因此，