EFFECT OF BRICK MASONRY INFILLS TO SEISMIC CAPACITY OF INDONESIA MULTI-STORY RC BUILDING

This paper discusses an analytical study on the effect of brick masonry infills to seismic capacity of the multi-story reinforced concrete (RC) structures by using the finite element computer codes called STructural Earthquake Response Analysis 3D (STERA 3D). A survived three-story RC building after the 2007 Sumatra earthquake was considered as an analytical model. The building was located in Padang city, West Sumatera, Indonesia. The model was analyzed for pushover and time history analyses. The pushover analysis was conducted followed UBC code and the recorded ground acceleration of 2009 West Sumatra earthquake was applied as input motion in time history analysis. The structural detail and material properties used in the analysis were collected from site investigated building after 2007 Sumatra earthquake. Two analytical RC building models were analyzed and compared in this study, i.e. bare RC frame model and brick masonry infilled RC frame model. The results of the analytical study were compared to the resume of the field observation after the earthquake for the considered building. The analytical results are clearly shown that the brick masonry infills may significantly improve the seismic capacity of the RC building. The RC building could be survived to large ground motion even the building was designed by applying the old Indonesia building code.