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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings
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Development and validation of a metallic haunch seismic retrofit solution for existing under-designed RC frame buildings

机译：针对现有设计不足的RC框架建筑物的金属腰部地震改造解决方案的开发和验证

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摘要

The feasibility and efficiency of a seismic retrofit solution for existing reinforced concrete frame systems, designed before the introduction of modern seismic-oriented design codes in the mid 1970s, is conceptually presented and experimentally investigated. A diagonal metallic haunch system is introduced at the beam-column connections to protect the joint panel zone from extensive damage and brittle shear mechanisms, while inverting the hierarchy of strength within the beam-column subassemblies and forming a plastic hinge in the beam. A complete step-by-step design procedure is suggested for the proposed retrofit strategy to achieve the desired reversal of strength hierarchy. Analytical formulations of the internal force flow at the beam-column-joint level are derived for the retrofitted joints. The study is particularly focused on exterior beam-column joints, since it is recognized that they are the most vulnerable, due to their lack of a reliable joint shear transfer mechanism. Results from an experimental program carried out to validate the concept and the design procedure are also presented. The program consisted of quasi-static cyclic tests on four exterior, 2/3 scaled, beam-column joint subassemblies, typical of pre-1970 construction practice using plain round bars with end-hooks, with limited joint transverse reinforcement and detailed without capacity design considerations. The first (control specimen) emulated the as-built connection while the three others incorporated the proposed retrofitted configurations. The experimental results demonstrated the effectiveness of the proposed solution for upgrading non-seismically designed RC frames and also confirmed the applicability of the proposed design procedure and of the analytical derivations.
机译：从概念上介绍和实验研究了在1970年代中期引入现代面向地震的设计规范之前设计的，针对现有钢筋混凝土框架系统的抗震改造解决方案的可行性和效率。在梁柱连接处引入了对角金属斜拉系统，以保护连接面板区域免受广泛的损坏和脆性剪切机制，同时颠倒梁柱子组件内的强度等级并在梁中形成塑料铰链。对于所提出的改造策略，建议采用完整的分步设计过程，以实现强度等级的所需反转。推导了改进后的节点在梁柱节点处的内力流的解析公式。该研究特别关注于外部梁柱节点，因为人们认识到它们最脆弱，因为它们缺乏可靠的节点剪切传递机制。还介绍了为验证概念和设计过程而进行的实验程序的结果。该程序包括对四个外部，2/3比例缩放的梁柱接头子组合件进行的准静态循环测试，这是1970年前施工过程中典型的使用带有端钩的平圆钢筋，有限的接头横向钢筋和没有能力设计的详细设计注意事项。第一个（对照标本）模拟了已建好的连接，而其他三个（包含了建议的改装配置）。实验结果证明了所提出的解决方案对于升级非抗震设计的RC框架的有效性，还证实了所提出的设计程序和分析推导的适用性。

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