Innovative Techniques for Strengthening RC Frame Systems

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The objective of this project is to study the performance of a rehabilitation scheme which can be used to correct the "weak links" in a frame system, but will simplify the construction process and reduce the time and inconvenience associated with most rehabilitation projects. The procedure is based on the use of precast wall segments to make up the infill between columns and floors and to supplement the axial tensile capacity of the existing columns through the use of post-tensioned tendons extending vertically through the structure at the columns. The research is divided into three parts. The first part involves a study of techniques for constructing the panel closure strips and evaluating their performance. The second part is directed toward a study of various methods for transferring forces at the infill panel-existing frame interface. Finally, a large-scale model comprising several stories of the structure with infills will be constructed to verify performance and provide data on overall system response. This project is a part of research initiative on "Seismic Repair and Rehabilitation of Structures."