Evaluation of Seismic Retrofit Strategies for Non-ductile Concrete Frame Structures

该项目得到以下方面的支持： 第二阶段的地震修复和 康复倡议（NSF 90- 23）。 钢筋混凝土框架结构 在美国建造的 1950年代和1960年代通常包括 非延展性细节与 抗震性能差。 的 这些细节的表现 实验研究。 这 项目涉及以下方面的战略 提高抗震性能 这些结构。 的目标 研究内容包括：（1）概述 改造战略 非延性混凝土框架 结构，（2）调查 改造策略基于 提高强度和延展性 关键帧细节， （3）提供一个 评价改造的方法 框架，（4）使用方法 来估计 和延展性， （5）建议 强度和 延展性改善。 一系列非韧性混凝土 将分析框架结构 改造策略将是 制定了 分析模型将 用最近的 试验结果 改造 框架将进行分析和改造 将对战略进行评估。 适当水平的指导方针 临界区域强度和 延展性将得到发展， 评估改装的方法 将提供战略。 的 准则和方法将 协助其他研究人员 开发改造技术， 将协助执业工程师， 现有结构的改造。 该项目将包括 与其他研究人员的互动 和实习工程师， 建筑物抗震设计。

This project is supported under Phase 2 of the Seismic Repair and Rehabilitation Initiative (NSF 90- 23). Reinforced concrete frame structures constructed in the U.S. during the 1950's and 1960's often include non-ductile details associated with poor seismic performance. The behavior of these details has been studied experimentally. This project addresses strategies for improving the seismic performance of these structures. The objectives of the research are: (1) to outline strategies for retrofit of non-ductile concrete frame structures, (2) to investigate retrofit strategies based on improving the strength and ductility of critical frame details and regions, (3) to provide a methodology for evaluating retrofit frames, (4) to use the methodology to estimate the levels of strength and ductility needed for critical regions, and (5) to recommend guidelines for strength and ductility improvement. A series of non-ductile concrete frame structures will be analyzed and retrofit strategies will be formulated. Analytical models will be calibrated with recent experimental results. Retrofit frames will be analyzed and retrofit strategies will be evaluated. Guidelines for appropriate levels of critical region strength and ductility will be developed, and a methodology for assessing retrofit strategies will be provided. The guidelines and methodology will assist other researchers in developing retrofit techniques, and will assist practicing engineers in the retrofit of existing structures. The project will include interactions with other researchers and practicing engineers in the seismic design of buildings.