Decision Making Tool for Seismic Retrofitting of Non-ductile Reinforced Concrete Building

摘要

Increasing seismicity and reported damage highlights a need for seismic vulnerability assessment of older (non-code conforming) buildings and retrofitting to reduce risk to public safety. The vulnerability can be reduced by developing a seismic retrofit program. This paper analytically investigates the effectiveness of different retrofit alternatives to upgrade performance levels of existing non-ductile reinforced concrete (RC) buildings. A seven-story reinforced concrete building located in western U.S. and designed according to 1964 Los Angeles City Building Code is selected as a case study. The seismic performance of the structure is examined for moderate and high hazard levels, namely: 10%, and 2% probability of occurrence in 50 year period. Two rehabilitation strategies, fiber reinforced polymer, and steel braces, are studied. The enhanced seismic performance of the building is evaluated using both nonlinear static and nonlinear dynamic analysis. Desired retrofitting technique is selected employing a decision making tool.