Seismic Analysis of Flat-Slab Structure Using ETABS and Safe

Abstract

The Flat Slab is a two-way concrete slab with reinforcement which consists of slab, column where load is directly transferred from slab to column as its seen that load transfer in conventional slab system is done through slab to beam and then to column, In Flat slab either Edge Beams, Drops and Column heads are provided depending upon its requirement. In Flat slab systems the load applied on slab gets directly transferred to the supporting column. In ETABS, the design of several types of slabs in which Flat Slab is one of them so it’s preferred using CSI-ETABS only, in ETABS the designs of various components of the structure is done under gravity load and lateral loads. In SAFE the slab is designed and analyzed under floor loads which is important for checking one way shear and slabs punching shear around the critical location which is around concentrated load, around column support and along edge beams. In the recent time use of Flat slab is continuously increasing because of its advantages like less building material cost and less construction cost, and in previously constructed Flat slab structure are not designed and analyzed properly for seismic forces and are vulnerable under these seismic forces. So it becomes very important to study the response of flat slab under seismic condition and its analysis. This system is very easy to construct and it’s very economical because of minimum floor height due to which number of stories can be increased in same height as that of conventional slab system. If this type of construction is done without proper design and detailing then this structure will be very vulnerable to earthquake. Flat slabs have been utilized in our constructions industry for many years. Designing and analyzing of flat slabs is still a very active research topic, and various techniques are still implemented. The study of flat slabs with edge beams and flat slabs with drops during seismic loads is presented in this paper. Zone factor and soil conditions-the other two significant boundaries which impact the conduct of the structure, are covered using ETABS. In this review connection between the number of stories, zone and soil condition is developed. In SAFE the design of slab and beam it is crucial because in flat slab system there is slab to column load transfer function, there is one way shear and punching shear which are critical in flat slab system because of its brittle mode of failure. So use of SAFE is done check deflection is in permissible limit and also long term deflection (due to creep and shrinkage) in permissible limit. Design codes used are IS: 456-2000 and IS: 1893-1-2016.