Evaluation of Repair and Rehabilitation Strategies for Tilt-Up Construction

9416449 Freeman倾斜式建筑在美国广泛用于低层工业和仓库设施。倾斜建筑的建造成本较低，但容易受到地震的破坏。在1994年的北岭地震中，震中地区大约25%的倾斜建筑遭受了结构性破坏。该项目的目的是制订程序，以评价现有的倾斜建筑和设计成本效益高的修复计划。本研究强调在建筑物的结构特征和地震期间的预期性能之间建立联系。将对倾斜建筑物进行现场试验，以评估隔膜刚度、阻尼特性和位移分布。这些测试的结果，连同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改变将被审查和总结。将评价典型的康复方案。与倾斜结构的动态行为相一致的替代分析模型和设计方法将被开发。这项调查的结果将为评估美国各地大量潜在危险的倾斜建筑的地震脆弱性和制定具有成本效益的修复方案提供基础。这是一个北岭地震项目，涉及伊利诺伊大学和咨询工程公司Wiss， Janney， Elstner和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. ***