Evaluation of Damage Class and Residual Seismic Capacity of RC Frame with Unreinforced Masonry Infill Wall Suffered by Earthquake

After an earthquake, the major concerns to damaged buildings are their safety/risk to aftershocks, quantitative damage assessment to evaluate their residual seismic capacity and to identify necessary actions on the damaged buildings. Few investigations on unreinforced masonry infill walls, however, have been made to quantitatively identify their damage level and criteria to judge necessary actions for their continued use, repair and rehabilitation although their damage has been often found in the past damaging earthquake. In this study, reinforced concrete (RC) frames with unreinforced concrete block (CB) walls for school buildings in Korea were tested under cyclic loadings to propose the evaluation method of their residual seismic capacity. In this paper, the relationships between the damage class represented by residual crack widths and the seismic capacity reduction factor corresponding to residual seismic capacity for columns and CB walls were estimated analytically and experimentally, and the factor corresponding to each damage class of RC frame with CB wall was proposed. Futhermore, the damage descriptions and crack widths corresponding to damage classes for CB walls was defined.