Seismic performance of flat slab shear-wall-core building
Kamlesh Parihar, Jitendra Sharma
Flat slab configurations are favored by both architects and clients because of their aesthetic appeal and economic advantages. Though this form of reinforced concrete construction gives several advantages over framed structures, they also present some disadvantages as brittle punching failure and large lateral deformations. In order to enhance performance of this configuration, designers embed shear-wall-core in flat slab building as lateral load resisting element. In current study, performance of 8, 12 and 16 storey flat slab buildings with out and with 2 and 4 shear-wall-cores have been studied for different levels of seismic hazards as classified in IS-1893-2002. Observed parameters of nonlinear static analysis, namely performance points, inter-storey drift ratios and hinge formation indicate that with the introduction of shear-wall-core in flat slab building, its behavior improves significantly under seismic loading. A pilot study on applicability of different expressions of Eurocode-8 for predicating fundamental time period of flat slab shear-wall-core building indicates that time period obtained by modal analysis (in SAP2000) is less as compared to that obtained by Eurocode-8. It is also interesting to note that in flat slab shear-wall-core building, the contribution of columns in lateral load sharing increases with increase in nonlinearity of this building system.