Seismic Design Evaluation of T Shaped Irregular Rc Building Plans By Using Pushover Analysis

Abstract

This study has been conducted to find out how Turkish Seismic Code 2007 is effective in providing the Life Safety (LS) and Performance Level (PL) of T shaped plan irregularities reinforced concrete multi-story buildings; with special lateral loads bearing moment frame systems. For this purpose, a set of 12 multi-story residential buildings: 3- rectangular plans as reference and their respective 9- different T shaped plans of 3-, 6- and 8- stories were considered in the North Anatolian Fault Zone (NAFZ) Turkey and were designed based on the code. Then, a modal and a static non-linear pushover analysis were conducted for all buildings. Base shear forces and roofs displacement for each building were computed. Besides, the formation trend of plastic hinges and their respective distribution in the entire buildings were inspected for evaluating the seismic performances. Results show that for some buildings the expected performance level which is LS has been overreached and even in some cases buildings reach the collapse prevention level. Based on this, it seems that the code provisions still require further upgrading to create enough confidence in the civil engineering community.