R/R: Strengthening and Repair of Nonductile Reinforced Concrete Frames Using External Steel Jackets and Plates (Collaborative Research)

该项目得到了NSF公告第90-23号的支持， “建筑物抗震性能的修复与恢复研究” 结构. " 需要加强现有建筑物， 抗震是建筑工程领域迫切需要解决的问题 地震工程 现有结构的主要类别 被确定为构成最大地震危险之一的是 非延性混凝土框架 一些加强 混凝土框架的技术包括增加结构 墙，增加钢支撑，扩大柱子， 梁使用钢筋混凝土夹克。 一个替代 混凝土导管架的方法是使用外部钢筋 连接到现有构件上的导管架和板。 钢 夹克可以提供减少劳动的显著优点， 降低成本，减少对现有设施的干扰， 与使用混凝土套管相比。 拟议的研究计划将调查关键问题 与外部钢套和钢板的使用有关 用于加固非韧性混凝土框架。 项目 由许多相互关联的测试组成，分为三个 主要阶段： I -钢-混凝土连接的性能; II -性能 用钢套加固的单个构件;以及III - 加固梁柱组合体的性能 钢夹克 该项目的总体目标是 制定设计准则，以有效实施 钢套作为加固和修复技术。 该项目是合作研究活动的一部分 涉及一个学术机构和两个专业 工程办公室共同努力， 结果付诸实践。

This project is supported under NSF Announcement NO. 90-23, "Repair and Rehabilitation Research for Seismic Resistance of Structures." The need to strengthen existing buildings with inadequate seismic resistance is an urgent problem in the field of earthquake engineering. A major class of existing structures identified as posing one of the greatest seismic hazards are nonductile concrete frames. A number of strengthening techniques for concrete frames include addition of structural walls, addition of steel bracing, and enlarging of columns and beams using reinforced concrete jackets. An alternative approach to concrete jackets is the use of external steel jackets and plates attached to the existing members. Steel jackets may offer significant advantages of reduced labor, reduced cost, and reduced disruption to existing facilities, as compared to the use of concrete jackets. The proposed research program will investigate critical issues associated with the use of external steel jackets and plates for strengthening nonductile concrete frames. The project consists of a number of interrelated tests, divided into three major phases: I - behavior of steel-to-concrete connections; II - behavior of individual members strengthened with steel jackets; and III - behavior of beam-column subassemblages strengthened with steel jackets. The overall objective of the project is to develop design guidelines for the effective implementation of steel jackets as a strengthening and repair technique. This project is one part of a collaborative research activity involving an academic institution and two professional engineering offices in a common effort to implement research results into practice.