Assessment and Design Procedure for the Seismic Retrofit of Reinforced Concrete Beam-Column Joints using FRP Composite Materials
Assessment and Design Procedure for the Seismic Retrofit of Reinforced Concrete Beam-Column Joints using FRP Composite Materials
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DOI：
10.1061/(asce)cc.1943-5614.0000242
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发表时间：
2012-01-01
影响因子：
4.6
通讯作者：
Pampanin, Stefano
中科院分区：
文献类型：
--
作者：
Akguzel, Umut;Pampanin, Stefano
在这项研究中，现有的钢筋混凝土（RC）梁柱节点的预期性能的评估之前和之后被改造使用纤维增强聚合物（FRP）复合材料的分析程序。重点是给出的剪切强度与变形性能的面板区域无论是在建成或FRP改装配置的评价。基于实验和数值证据，以及物理模型代表的力学的联合区域，主拉伸应力与联合剪切变形的关系，并首选更传统的名义剪切强度规则，评估，在一步一步的迭代过程中，联合剪切贡献的组合提供的FRP复合材料和混凝土芯单独提供。主应力的使用允许人们直接考虑轴向载荷变化的影响，这在梁柱节点的评估和改造中通常被忽略。通过M-N相互作用性能域，将梁柱子系统内预期的强度和事件序列（损坏机制）的层次可视化，用作基于性能的改造理念的基础。针对特定的极限状态或设计目标，同时注意强度和变形极限。根据文献中提供的一组实验检测结果验证了拟定的分析方法。为了提供一个简单的设计工具，可以很容易地实现由执业工程师，FRP加固梁柱节点的预期性能的评估提供了一个工作的例子，并作为一个参数研究的基础，说明不同的加强方案的影响，加强外部节点面板在各种轴向载荷水平下的行为。DOI：10.1061/（ASCE）CC.1943-5614.0000242。(C)2012年美国土木工程师学会。
In this study, an analytical procedure for the evaluation of the expected performance of existing reinforced concrete (RC) beam-column joints before and after being retrofitted using fiber-reinforced polymer (FRP) composite materials is presented. Focus is given on the evaluation of the shear-strength versus deformation properties of the panel zone region either in the as-built or FRP-retrofitted configuration. Based on experimental and numerical evidence as well as on physical models representing the mechanics of the joint region, principal tensile stresses versus joint shear deformation relationships are adopted and preferred to more traditional nominal shear-strength rules, to evaluate, within a step-by-step iterative procedure, the combination of the joint shear contribution provided by the FRP composite material and that provided by the concrete core alone. The use of principal stresses allows one to directly account for the effects of variation of axial load, typically neglected in the assessment and retrofit of beam-column joints. The hierarchy of strength and sequence of events (damage mechanisms) expected within a beam-column subsystem are visualized via M-N interaction performance domains, used as a basis for a performance-based retrofit philosophy. Specific limit states or design objectives are targeted, with attention given to both strength and deformation limits. The proposed analytical procedure is validated on the results of a set of experimental tests available in the literature. With the intention to provide a simple design tool that can be easily implemented by practicing engineers, a worked example for the evaluation of the expected performance of an FRP retrofitted beam-column joint is provided and used as a basis for a parametric study to illustrate the effects of different strengthening schemes on the behavior of strengthened exterior joint panels under various axial load levels. DOI:10.1061/(ASCE)CC.1943-5614.0000242. (C) 2012 American Society of Civil Engineers.