SEISMIC EVALUATION OF RC SPACE FRAME WITH RECTANGULAR AND EQUIVALENT SQUARE COLUMN BY PUSHOVER ANALYSIS

Abstract

The present study is carried out to compare the seismic performance of RC frame structures of G+15 storey which consisting of rectangular shaped column as against equivalent square shaped column. The building is having 4.5m x 4.5m panels in both directions forming an overall plan dimension of 31.5m x 13.5m. All the beams are considered as 300 mm x 600 mm in size and columns with of 3 m height in each floor. In the above model all the rectangular shaped columns are oriented with longer side in global Y direction and shorter side parallel to global X direction. The M25 grade of concrete and Fe 415 grade of steel is considered for design. Pushover analysis is carried out, using commercially available software ETABS and behavior of RC frames is studied. One more factor which is studied in the current models is the material consumption variation for keeping the building in Immediate Occupancy stage. Also the comparison of normal RC frame and immediate occupancy level RC frame for both shaped columns is carried out. Quantity of concrete and quantity of steel is calculated for all the models and the overall structural cost is evaluated. Comparison for all the models in terms of quantity of materials and structural cost is also reported. It is concluded that the square cross section of columns perform better as compared to rectangular cross section of columns.