Experimental Evaluation of Retrofit Mechanisms for Precast R/C Tilt-up Wall-Foundation Connections

该项目得到了 第二阶段（第二年）计划 地震修复和重建 倡议（NSF 90-23）。 该项目的重点是一个 实验研究计划 现有抗震加固 预制构件之间的连接， 钢筋混凝土斜墙 和他们的基础来改善 他们的抗震性能。 这 成本效益的建筑类型是 广泛用于办公楼， 工厂、商店和仓库。 据估计，大约一半的 R/C工业设施是 采用上倾式结构建造。 最近完成的大部分工作 在改造倾斜墙时 集中在屋顶墙上 连接，因为它被认为是 大会中最薄弱的环节 很少注意 另一个薄弱环节就是墙 基础连接 许多 这些现有的连接缺乏 足够的延展性和细节， 可能会经历剪切滑移破坏 在强烈的地面震动下 的 项目包括一个详细的 假设与 实际弹性和非弹性 基础墙承载力 连接;评估 纠正措施的有效性 旨在提高 连接强度和延性; 评价建议 标准和设计指南 修复现有 结构.

This project is supported under the Phase 2 (second year) program of Seismic Repair and Rehabilitation Initiative (NSF 90-23). This project focuses on an experimental research program for seismic rehabilitation of existing connections between precast, reinforced concrete tilt-up walls and their foundation to improve their seismic performance. This cost-effective construction type is widely used for office buildings, factories, stores, and warehouses. It is estimated that about half of the R/C industrial facilities are built using tilt-up construction. Much of the work performed recently in retrofitting tilt-up walls concentrated on the roof-wall connection as it is considered the weakest link in the assembly. Little attention has been given to another weak link which is the wall- foundation connection. Many of these existing connections lack adequate ductility and detailing and could experience shear slip failure under strong ground shaking. The project includes a detailed comparison between assumed and actual elastic and inelastic capacity of the foundation-wall connection; an evaluation of the effectiveness of the corrective measures intended to increase the connection strength and ductility; and recommendations on evaluation criteria and design guidelines for the rehabilitation of existing structures.