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

预制 R/C 倾斜墙体基础连接改造机构的实验评价

• 批准号: 9120407
• 负责人: Medhat Haroun
• 金额: $ 8万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-15 至 1993-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9120407&HistoricalAwards=false
• 关键词: Experimental; Evaluation; Retrofit; Mechanisms; Precast

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.

该项目得到地震修复和康复计划 (NSF 90-23) 第二阶段（第二年）计划的支持。 该项目的重点是预制钢筋混凝土倾斜墙及其地基之间现有连接的抗震修复实验研究计划，以提高其抗震性能。 这种经济高效的建筑类型广泛用于办公楼、工厂、商店和仓库。 据估计，大约一半的遥控工业设施是采用倾斜结构建造的。 最近在改造倾斜墙方面进行的大部分工作都集中在屋顶与墙壁的连接上，因为它被认为是装配中最薄弱的环节。 很少有人关注另一个薄弱环节，即墙体与基础的连接。 许多现有的连接缺乏足够的延展性和细节，在强烈的地面震动下可能会出现剪切滑移失效。 该项目包括基础墙连接的假设弹性和非弹性能力与实际弹性能力的详细比较；评估旨在提高连接强度和延展性的纠正措施的有效性； 以及关于修复现有结构的评估标准和设计指南的建议。