Seismic Performance Evaluation of Building with Flat Slab in a Sloping Region

Flat slabs offer several advantages over traditional reinforced concrete slabs, one of them being their efficient use of materials, making them a popular choice in modern construction projects. The absence of beams also simplifies the installation of building services, making maintenance and renovations easier and more cost-effective in the long run. The objectives of this paper are to evaluate the seismic performance of buildings with flat slabs using different arrangements of shear walls with openings in step back and setback buildings, analyze the flat slab structure against punching shear using stud rails in different configurations, evaluate the performance of post-tensioning in flat slabs, and obtain the most economical configuration for buildings with flat slabs. Step-back-setback G+8 building is modelled with a slope of 30°. ETABS software 2018 is used for modelling flat slab building and parameters such as time period, maximum storey displacement and maximum storey drift is studied by Response Spectrum Analysis. SAFE software is used to analyse the punching shear in slabs. Comparing setback and step back configurations, setback buildings exhibit superior seismic stability. Incorporating L-type shear walls with 1.5 m × 1.5 m openings decreases storey displacement by 88.69%. Post tensioning optimizes slab thickness to 150 mm, reducing deflection to 15.61% and costs by 14.74%. Radial layout stud rails are the most efficient solution for punching shear resistance.