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Seismic evaluation of reinforced concrete bridges using capacity-based inelastic displacement spectra

机译：基于容量的非弹性位移光谱的钢筋混凝土桥梁的地震评价

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摘要

A simplified seismic evaluation method using capacity-based inelastic displacement spectra is proposed for reinforced concrete (RC) bridges. The proposed method can not only estimate the maximum displacements of bridges, but can also discriminate the damage indices between the bridge columns, where the Park and Ang's damage index (DI) is considered a promising performance indicator due to its good relationship with the strength capacity state and actual visual damage condition of the bridge column regardless of the imposed loading history. To realize the accuracy and reliability of the proposed method, a hypothetical case study bridge was constructed and analyzed using various structural analysis programs and seismic evaluation methods. It was found that the proposed method can receive satisfactory estimates of the maximum displacement and DI for both far-field and near-fault ground motions when compared to the nonlinear time history analysis results of the bridge. In contrast, the AASHTO's and Caltrans' methods cannot reflect the response amplification effects caused by the frequency-content characteristics of near-fault ground motions and would therefore significantly underestimate the inelastic responses of bridges. When applying the proposed method to bridges having unequal-height columns and subjected to longitudinal seismic actions, it was found that for the short column of the bridge, the AASHTO's regularity criteria (maximum bent/pier stiffness ratio of 4 for the three-span case study bridge) would lead to a DI of approximately 3.5 times that of the tall column, resulting in significant damage localization and, hence, decreasing the overall lateral deformation capacity of the bridge.
机译：提出了一种用于钢筋混凝土（RC）桥的容量基间位移光谱的简化地震评价方法。所提出的方法不仅可以估计桥梁的最大位移，而且还可以区分桥柱之间的损坏指数，其中公园和Ang的损坏指数（DI）被认为是由于其与强度容量的良好关系而被认为是一个有希望的性能指标无论强加的加载历史如何，桥柱的状态和实际视觉损伤条件。为了实现所提出的方法的准确性和可靠性，使用各种结构分析计划和地震评估方法构建并分析假设案例研究桥。结果发现，与桥的非线性时间历史分析结果相比，该方法可以获得最大位移和近故障地面运动的令人满意的估计。相比之下，AASHTO和CALTRANS的方法不能反映由近故障地面运动的频率 - 内容特性引起的响应放大效应，因此显着低估了桥梁的非弹性响应。当将该方法施加到具有不等高度柱并且经受纵向地震作用的桥梁中时，发现对于桥的短柱，AASHTO的规则性标准（三跨壳体的最大弯曲/墩刚度比为4研究桥梁）将导致高柱的DI约为3.5倍，从而导致损坏定位显着损坏，因此降低了桥梁的整体横向变形容量。

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