Abstract
Structures on incline ground are vulnerable to earthquakes because of irregularities in plan and elevation. The structural configurations on slopes have been observed, with stepback and stepback-setback configurations being the most common. In mid to high rise buildings, shear wall and C-shaped shear wall cores are commonly used lateral load resisting components. The current research focuses on comparing the seismic performance of L-shear walls(LSW) at the corners, C shear-walls at core(CSW) and Reinforced concrete-filled steel tube column (RCFST) at corners and cores in stepback, and stepback-setback configurations buildings considering the base of the structures fixed designed for Indian codes using response spectrum analysis. The structural analysis tool ETABS 2017 was used to perform seismic analysis. Buildings on a hill slope with various configurations are studied: bare frame, concrete blockwork infill, LSW full bay at corners, LSW half bay at corners, CSW and RCFST column at corners and core. The characteristic parameters such as base shear, forces in the columns at the ground floor, storey drift, maximum 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. Structures with corner LSW perform better than buildings with centrally located shear walls at the core, whereas LSW at half bay in the corner and RCFST columns at corners and core serve the dual objective of space constraint and improved performance.
Highlights
Strong earthquakes arise at any time, and constructions with irregularity have been shown to be the most susceptible
As per the equivalent static method, in IS 1893(Part 1):2016, the empirical relation is given cannot portray the right values of the time period in both along and across the slope direction, whereas Response spectrum analysis using free vibration analysis produced better results
The seismic response of the two typical configurations of building on slopes and building on flat terrain was studied by performing Response spectrum analysis
Summary
Strong earthquakes arise at any time, and constructions with irregularity have been shown to be the most susceptible. Due to the unpredictability of mountainous slopes, the influence of slope on structures subjected to seismic loads must be investigated
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