Performance evaluation of T-shaped irregular reinforced concrete structures with nonlinear method

This study was carried out in order to obtain information about the behavior of reinforced concrete multi-storey buildings with rectangular and T-shaped plan irregularities and with frame system effect under horizontal and vertical loads. Besides, the horizontal load carrying capacity of buildings with T irregularities was determined, which models were safer according to the regular plan, and the results obtained were comparatively interpreted. For this purpose, 12 reinforced concrete houses constructed as 3, 6 and 8 storeys are modeled. In all of the 3, 6 and 8-storey buildings, a model consisting of 5 spans was prepared as reference model. In this model, the x openings are 4 meters and the y openings are 3 meters. Vertical axes are named alphabetically (A, B, C, D, E, F) and horizontal axes are numerically named (1,2,3,4,5,6). Models with various T plan irregularities were obtained by removing the columns and slabs from the reference models with respect to x and y directions as 1, 2 , 3 and A , F axes respectively. This work consists of four parts: The first part deals with the general introduction, historical background, problem statement, purpose and scope of the work. In the second part; introduction, pushover analysis, performance evaluation concepts, RC section bending effect and ductility are discussed. In the third part all considered buildings are examined in detail in terms of design and performance evaluation with static pushover analysis. Finally, some suggestions are given based on the comparative evaluation of the data obtained from the analyzes. According to the obtained results, low-rise buildings have more seismic load carrying capacity than high buildings in the same category. This results from the fact that although the buildings are designed on precisely the same criteria as the linear methods in the seismic design, practical low-rise buildings are more resistant to earthquakes than high buildings due to the high capacity of carrying horizontal loads.Thus, it can be stated that low-rise buildings can actually be economicaly designed. The reduction factor allows for the prescribed capacity design principles to reduce the predicted seismic loads. However, this can be interpreted as inadequate. In estimating the equivalent seismic load, a reduction coefficient that can be estimated inversely proportional to floor level can ensure that low-rise buildings are both safe at a satisfactory level and more economical.