1 Seismic Evaluation of Flat Slab Buildings with Shear Wall Seismic Evaluation of Flat Slab Buildings with Shear Wall Flat slab system is being adopted in many buildings presently due to the advantage of reduced floor heights to meet the economical and architectural demands. Flat slab construction gives lesser floor-to-floor height for the same headroom. Generally, flat slab column system is designed in lower seismic zone areas for resisting gravity loading. Its performance reduces drastically as this system is introduced to lateral loadings of higher seismic zones. As IS code is silent about flat slab structure design provisions in higher seismic zones, while analyzing these structures in such zones, we must have certain provisions to get rid of its poor performance. Thus, to resist this lateral loading, this system is provided with lateral load resisting elements such as shear walls. This paper deals with the behavior of flat slab column system which was designed safe for resisting gravity loading is studied for lateral loading of Zone IV and Zone V as defined in IS: 1893-2002 for 8, 12 and 16 storey flat plate building . Along with this, how its behavior varies and improves with the introduction of shear wall is studied using static nonlinear analysis, i.e., pushover analysis and the results are presented. Prithwi Raj K 1 , Umesh K Sharma 2 , Yogendra Singh 3 , Pradeep Bhargava 4 and N M Bhandari 5 Introduction Use of flat slab in building systems is finding much preference these days because of its distinct role in cost cutting due to the use of slip forms in construction, which gives lesser floor-to-floor height for same headroom. Flat slab structures have flexible space utility and thus mostly preferred in offices and parking areas. In flat slab buildings, load is transferred directly from slab to column. Flat slab systems are not accounted as primary lateral load resisting element because of their poor seismic © 2011 IUP. All Rights Reserved. 1 M. Tech., Computer Aided Design, Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India. E-mail: riterulez@gmail.com 2 Assistant Professor, Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India. E-mail: umuksfce@iitr.ernet.in 3 Associate Professor, Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India. E-mail: yogenfeq@iitr.ernet.in 4 Professor, Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India. E-mail: bhpdpfce@iitr.ernet.in 5 Professor, Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India. E-mail: nmbfce@iitr.ernet.in Keywords: Flat slabs, Shear wall, Pushover curve, Performance points, Performance level, Yield pattern, Inter storey drift ratio, Punching shear failure Author/ CE pl chk