Fragility Assessment of Mid-Rise Flat Slab Structures

Abstract

AbstractFlat slab structures have advantages over conventional RCC framed structures in terms of construction time as no beams are required to transfer loads from slabs to columns and thus the faster rate of construction is achieved, with less floor height demand, larger clearance of slab to floor, etc. These structures have disadvantages like higher flexibility, high punching shear at slab column junction, and poor performance under seismic loads which cannot be ignored. This study presents fragility curves for mid-rise flat slab RCC structures without masonry infill walls. A nonlinear static pushover analysis is performed to capture the nonlinear seismic response of a sample of structures while monitoring the performance limit states. The HAZUS methodology was used for developing the fragility curves given by the HAZUS technical manual. This study evaluates the losses in flat slab RCC structures due to earthquakes for specific seismic zones in India and compares them with the conventional frame structures. FEM-based software CSI ETABS 2018 has been used as a tool. The present study contributes to quantifying seismic fragility. The fragility curves are interconnected and planned to provide a logical and consistent probability treatment of damage or loss. The fragility curves are found to evaluate and interpret the results.KeywordsFragility curvesFlat slabsHAZUS methodologyNonlinear static pushover analysis