SEISMIC RESPONSE OF REINFORCED CONCRETE FRAME RESTING ON HILL SLOPES

Abstract

The Constructions done in the hilly regions are more vulnerable seismically in contrast with the structures built in flat terrains. The structures constructed in hilly regions are usually irregular, these structures are irregular both in mass and stiffness. Constructions done on the sloping ground is different from usual structures since they're asymmetrical in both horizontal and vertical directions. Columns of the bottommost storey have a varying height because of inclining ground and are torsionally coupled, henceforth draw in a lot of shear forces, and without proper detailing building constructed on sloping ground is susceptible to moderate to heavy damage. In this analysis, the seismic response of three different building configurations i.e., Regular, Stepback, Stepback-Setback is evaluated. The structural analysis tool ETABS 2017 was used to perform seismic analysis utilising the linear static and dynamic methods. Buildings on a hill slope with various configurations are studied in two parts; first being: bare frame, soft storey, totally concrete blockwork infill, a soft storey with shear wall at corners, frame with composite columns at the bottommost storey and second part being: L-shear walls(LSW) at the corners, C shear-walls at core(CSW) and Reinforced concrete-filled steel tube column (RCFST) at corners and core in stepback, and stepback-setback configurations. The characteristic parameters such as base shear, forces in the columns at the ground floor, storey drift, maximum top storey displacement, time period, the bending moment in columns at every floor level and storey shear in structures will be determined and analysed for the different structures at the sloping ground. Finally, the reasonableness of various designs of slope structures would be proposed.