A simplified method for the estimation of the seismic resistance of RC frames with weak infill panels

This paper discusses a simplified procedure for the determination of the lateral force-vs.-drift relation of RC frames with weak masonry infill panels. With the proposed method, the force-vs.-drift curve for an infilled RC frame can be estimated based on the frame geometry, design details, and basic material properties. The procedure takes into account the relative strengths and stiffnesses of the infill with respect to the bounding frame which influence the failure mechanism and strength of an infilled frame. The framework has been validated with data from experimental and analytical studies on single-bay, single-story specimens with a wide range of geometries, design details, and material properties. The comparison of the analytical and experimental results indicates that the proposed methodology can successfully capture the main features of the seismic response, including the initial stiffness, peak strength, and residual load capacity.