Retrofit Strategies for Non-Ductile Reinforced Concrete Flat-Slab Buildings

无延性的平板建筑在中等强度的地震中容易受到严重破坏，甚至可能倒塌。美国中部和东部地区有大量这样的建筑。连接处的冲压失败可能会导致渐进式倒塌。该项目的主要目标是制定最低限度的翻新战略，以限制全球反应，并确保在适度地基期间结构的完整性。动议。要做到这一点，为预测无延性平板房屋在地震荷载作用下的反应提供了一种合适的分析工具首先发展起来的。最近开发的三参数滞回模型将被纳入到一个编制了非线性动力分析程序，对各种改造方案进行了分析比较。旨在测试连接层的加固方案以防止逐步倒塌和受控荷载重新分配的试验也将被执行。特别是，将对使用填充墙来提高横向荷载抗力的概念进行较详细的研究。通过实验和分析研究，该项目预计将提供一种综合改造战略，以在连接级别的保护和受控的全球响应。该项目得到了美国国家科学基金会第92-28号研究计划的支持，该计划的主题是“结构抗震修复和恢复研究”。

Non-ductile flat-slab buildings are susceptible to severe damage and possibly collapse during earthquakes of moderate intensity. The central and eastern regions of the United States have a large inventory of such buildings. Progressive collapse can result from punching failure at connections. The main objective of the project is to develop minimum-retrofit strategies to limit the global response and ensure structural integrity during moderate ground motion. To accomplish this, a suitable analysis tool for predicting the response of non- ductile flat-slab buildings under earthquake loading will be developed first. A recently developed three-parameter hysteretic model will be incorporated into an existingnonlinear dynamic analysis program to analyze and compare various retrofit strategies. Experiments aiming at testing retrofit schemes at the connection level for protection against progressive collapse and controlled redistribution of loads will also be carried out. In particular, the concept of using infill walls to improve the lateral load resistance will be studied in some detail. With both experimental and analytical studies, this project is expected to provide an integrated retrofit strategy optimized for a balance between protection at the connection level and a controlled global response. This project is supported under the NSF Research Initiative No. 92-28 on "Repair and Rehabilitation Research for Seismic Resistance of Structures."