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首页> 外文期刊>Transportation Research Record >Seismic Retrofit of Flared Reinforced Concrete Columns in Multispan Viaduct: From Research to Field Implementation
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Seismic Retrofit of Flared Reinforced Concrete Columns in Multispan Viaduct: From Research to Field Implementation

机译：多跨高架桥中扩口钢筋混凝土柱的抗震改造：从研究到现场实施

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摘要

Following the failure of the flared column in the Mission Gothic Overpass during the Northridge Earthquake, a multiphase study of flared bridge columns in northern Nevada was undertaken. The study, the field implementation, and a cost-benefit analysis for a 16-span viaduct are summarized. The study included analytical evaluation of the piers in addition to quasistatic and shake table testing of large-scale as-built and retrofitted columns. The jacket material included steel, glass-fiber composites, and carbon-fiber composites. Results showed that shear retrofit provided sufficient displacement ductility capacity even though the confinement requirements were not met. All three jacket materials were found to be satisfactory. Because the space under the bridge was used for offices and garages and because the working space around many of the columns was limited, composite fabrics were selected for field implementation. Because the columns were flared and nonpris-matic, a continuous wrap could not have been applied efficiently. A new method of composite installation was devised in the course of research and was used in the field. As a result of the research, less than one-third of the columns were found to be in need of retrofit. The cost-benefit analysis of the selected retrofit indicated a 64% saving over the cost of conventional column retrofit.
机译：在北岭地震期间，哥特式立交桥的扩口柱失效后，对内华达州北部的扩口桥柱进行了多阶段研究。总结了16跨度高架桥的研究，现场实施和成本效益分析。该研究除了对大型竣工和改建的圆柱进行准静态和振动台测试外，还包括对墩的分析评估。护套材料包括钢，玻璃纤维复合材料和碳纤维复合材料。结果表明，即使不满足约束要求，剪力翻新也能提供足够的位移延展能力。发现所有三种夹克材料都令人满意。由于桥下的空间用于办公室和车库，并且由于许多立柱周围的工作空间有限，因此选择复合织物进行现场实施。由于色谱柱呈喇叭形且非棱柱形，因此无法有效地进行连续包裹。在研究过程中设计了一种新的复合材料安装方法，并将其用于该领域。研究的结果是，发现不到三分之一的色谱柱需要翻新。所选改造的成本效益分析表明，与传统色谱柱改造相比，可节省64％的成本。

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