Retrofit technique for existing old R/C buildings with horizontally mixed structural system by use of exterior steel frames

建议采用水平混合结构体系对既有旧楼房进行改造。本项目开展了以下试验研究和分析工作：(1)采用后锚螺栓连接节点技术的发展；(2)多层加固建筑结构的弹塑性反应性能评价。并对建议连接节点的试件进行了水平加载试验。根据试验结果，阐明了该节点的抗力机理和极限状态。在此基础上，对试验结果进行了详细的有限元分析，提出了分析模型和设计准则。其次，对改造后的多层建筑结构模型进行了弹塑性反应分析。根据分析结果，明确了结构的极限地震反应行为。

Horizontally mixed structural system was suggested to retrofit the existing old R/C buildings. In this project, the following experimental and analytical studies are conducted, (1) the development of connection joint technique by use of post installed anchor bolts, and (2) an evaluation of inelastic response behavior for multi story retrofitted buiding structure.The first, the specific and actual connection joint method between R/C and extended steel member is proposed. And the horizontally loading tests are conducted on test specimen with proposed connection joint. From the test results, the resistant mechanism and ultimate states of this joint are clarified. Furthermore, the FE analysis is conducted to investigate the test result in detail, and to propose the analytical model and design criteria.The next, the inelastic response analysis on multi story retrofitted building structural model is conducted. From the analysis results, the ultimate seismic response behavior are clarified.