Evaluation of Repair and Rehabilitation Strategies for Tilt-Up Construction

9416449弗里曼倾斜式建筑在美国各地广泛用于低层工业和仓库设施。 倾斜式建筑物建造起来很经济，但它们容易受到地震破坏。 在1994年北岭地震中，震中地区大约25%的倾斜建筑物遭受了结构性破坏。 本项目的目标是制定评估现有倾斜建筑和设计具有成本效益的修复方案的程序。 在这项研究中，强调建立一个链接的建筑物的结构特性和预期的性能在地震期间。 将对倾斜建筑物进行现场测试，以评估隔膜刚度、阻尼特性和位移分布。 这些测试的结果，以及收集到的在北岭地震中受损的倾斜建筑物的数据，将用于验证正在开发的详细分析模型。 现有的改造要求以及最新提出的变化将进行审查和总结。 将对典型的康复计划进行评估。 将开发与上倾结构动态行为一致的替代分析模型和设计方法。 这项调查的结果将提供一个基础，以评估地震的脆弱性和开发成本效益的恢复计划，为大量的潜在危险的倾斜建筑物在美国各地。 这是一个北岭地震项目，涉及伊利诺伊大学和一家咨询工程公司Wiss，Janney，Elstner and Associates之间的互补努力。 ***

9416449 Freeman Tilt-up construction is widely used throughout the U.S. for lowrise industrial and warehouse facilities. Tilt-up buildings are economical to construct, however, they are susceptible to seismic damage. Approximately 25% of the tilt-up buildings in the epicentral area sustained structural damage during the 1994 Northridge earthquake. The objective of this project is to develop procedures for evaluating existing tilt-up construction and designing cost effective rehabilitation schemes. Establishing a link between the structural characteristics of the building and the expected performance during an earthquake is emphasized in this study. In-situ tests of tilt-up buildings will be conducted to evaluate diaphragm stiffness, damping characteristics, and displacement distributions. The results of these tests, together with data collected on tilt-up buildings damaged in the Northridge earthquake, will be used to validate detailed analytical models under development. Existing retrofit requirements as well as the latest proposed changes will be reviewed and summarized. Typical rehabilitation schemes will be evaluated. Alternate analytical models and design methodology that are consistent with dynamic behavior of tilt-up construction will be developed. The results of this investigation will provide a basis for evaluating the seismic vulnerability of and developing cost effective rehabilitation schemes for the large number of potentially hazardous tilt-up buildings throughout the U.S. This is a Northridge Earthquake project, involving complementary efforts between the University of Illinois and a consulting engineering firm, Wiss, Janney, Elstner and Associates. ***