A Comparative Study on the Seismic Behavior of RCC Framed Building and Composite Framed Building

In Nepal, RCC framed structures are frequently and commonly used for building constructions observing that this is the most convenient & economic way for low rise construction. However, for medium to high rise constructions, this type of structural system is no longer econom-ical due to multiplied dead load, span limit and difficult formwork. But many research studies illustrate that if well designed, composite framed structure can offer economical structural system to resist lateral load with excessive durability, rapid erection and superior seismic overall performance characteristics [1]. Composite structure implies steel section encased in concrete for columns and the concrete slab is hooked up to the steel beam with the assist of mechanical shear connectors so that they can act as a single unit. This research is especially focused at the conduct of the RCC and composite framed structures. To study the forces, failures and seismic behavior of such building constructions, Response Spectrum and Pushover Analysis Methods are carried out. The Pushover analysis method provides us to study the effect of plastic hinges in the structure and helps to find out the maximum structural non-linear response to seismic loads and Performance Point of the structure. On this study (G+33) storey structure is modelled in ETABS with its respective composite structure as according to IS: 1893 (Part1)-2016 (Criteria for Earthquake Resistant Design of Structure), IS 456:2000 (Plain and Reinforced Concrete Code of Practice), IS 800:2007 (General Construction in Steel Code of Practice), IS 875 (part I) (Dead Load), IS 875 (part II) (Imposed Load) and IS 875 (part III) (Wind Load). The models are situated in Kathmandu, Nepal with a seismic zone V. The grade of concrete used are M25 and M30. The idea of strong column weak beam is followed here at all the point of the evaluation. The RS analysis approach has been used with the assist of ETABS for both the composite and reinforced concrete structures. The outcomes have been compared in detail for distinct parameters like base shear, Storey Displacement, Storey Drift, Diaphragm Max over Avg. Drift and overturning moment for each model of concrete framed structures with their respective composite framed buildings.