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Seismic performance evaluation of multi-column bridge bents retrofitted with different alternatives using incremental dynamic analysis

机译:利用增量动力分析评估不同替代方案的多柱桥梁弯管的抗震性能评估

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A comprehensive study has been carried out to numerically investigate the performance of a three column bridge bent retrofitted with different options. The bridge bent represents a typical case of vulnerable bridges since it was built in the early sixties with minimal seismic design requirements. This study evaluates four different retrofitting provisions, namely carbon fiber reinforced polymer (CFRP) jacketing, steel jacketing, concrete jacketing, and engineered cementitious composite (ECC) jacketing for improving the seismic performance of this non-seismically designed bridge bent. Finite element methods have been implemented in this study where each retrofitting technique has been modeled and numerically validated with the experimental results. Analytical models of those retrofitted bridge bents have been developed using finite element analysis tools and verified against experimental results. Nonlinear static pushover analyses have been performed to compare their performances in terms of performance criteria such as the displacement and base shear at cracking, yielding, and crushing. Incremental dynamic time history analyses have been performed to assess the dynamic behavior of the retrofitted bents and to generate required data for performance-based evaluations. The performance-based assessment study employed 20 near fault ground motions to compare the performance of these retrofitting strategies in terms of maximum drift (%), residual drift, and ductility demand. The results indicated that both the CFRP and ECC jacketing were effective in reducing the anticipated damage of the retrofitted bridge bent.
机译:进行了全面的研究,以数值方式研究了采用不同选择进行改装的三柱式桥梁的弯曲性能。弯曲的桥梁代表了易受伤害的桥梁的典型案例,因为它始建于60年代初期,对地震的设计要求极低。这项研究评估了四种不同的改造规定,即碳纤维增强聚合物(CFRP)护套,钢护套,混凝土护套和工程胶结复合材料(ECC)护套,以改善这种非地震设计的桥梁弯头的抗震性能。在这项研究中已经实施了有限元方法,其中每种改造技术均已建模并通过实验结果进行了数值验证。这些翻新桥梁弯头的分析模型已使用有限元分析工具开发,并针对实验结果进行了验证。已经进行了非线性静态推覆分析,以根据性能标准(例如开裂,屈服和压溃时的位移和基础剪力)比较其性能。进行了增量动态时程分析,以评估改装弯头的动态行为,并生成基于性能的评估所需的数据。基于性能的评估研究采用了20条近断层地震动,以最大漂移(%),残余漂移和延性需求的方式比较了这些改造策略的性能。结果表明,CFRP和ECC护套均有效地减少了改型桥梁弯头的预期损坏。

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