INVESTIGATION OF STRUCTURAL BEHAVIOR IN SHEAR-FRAMED REINFORCED CONCRETE STRUCTURES WITH DIFFERENT MEZZANINE HEIGHTS

Frame systems with vertical carriers consisting only of columns and beams are sufficient for vertical loads, but it can be seen that horizontal loads such as earthquake loads are met to a lesser extent than vertical loads. In order for the columns to be more resistant to horizontal loads, the column dimensions should be kept extremely large. This solution increases the cost of the structure. This situation has led researchers to develop different structural systems to meet horizontal loads such as earthquake and wind, and one of those systems is to put shear walls between the carriers of the building. In shear-framed structures, shear walls, properly distributed in the plan, can both resist vertical loads and absorb a large part of the energy of earthquakes coming from underground. In this study, 3-storey and 5-storey reinforced concrete structures with symmetrically designed shear walls and frames are investigated. The purpose of selecting the structural elements and geometry of the structure symmetrically is to obtain a structural system layout without torsional irregularities. Normal floor heights are 3 meters in all building types. The height of the ground floor is fixed at 4 meters in all models. However, the height of the mezzanine floor varies as 3.0 meters in models with a ground floor of 7.0 meters, 2.5 meters in models with a ground floor of 6.5 meters, and 2.0 meters in models with a ground floor of 6.0 meters. Normal floor heights are 3 meters in all model types. A total of six different building models were created using different ground floor heights and mezzanine heights for the same mezzanine type. Analyses of the models of all building types were carried out in the Sap2000 program environment. In order to examine the structural behavior of the models, building periods, base shear forces, peak maximum displacement and soft story irregularity coefficients were compared.