Cost Evaluation In Seismic Analysis And Aseismic Design of RC Framed Structure

Abstract

Determination of design lateral forces is the primary requirement of seismic analysis and design of a structure. The aim of this work is to analyse and design multi-storeyed RC frames for earthquake forces for different seismic zones in India. The lateral forces due to Earthquake were evaluated as per IS1893 (Part1):2002, by Response Spectrum method and Seismic coefficient method by programs developed in MATLAB. Also increase in cost of construction of earthquake resistant frames is compared with that of the conventional design by analysing a twelve storey building with Ordinary Moment Resisting Frame (OMRF) and Special Moment Resisting Frame (SMRF). Lateral forces on the SMRF and OMRF due to earthquake in all zones of India were obtained by using the MATLAB program for Seismic co-efficient method and the analysis and design for critical load combinations were carried out in STAAD. Pro. It is found that there is only a marginal increase in cost of 8% to 40% for both the type of construction in zone II to IV from the conventional frame. While increase in cost of construction in zone V is 50 % and 53% respectively for SMRF and OMRF. Hence it is advisable to design multi-storeyed RC frames considering seismic forces in all earthquake zones of India and also as a Special Moment Resisting Frame for the safety of men and material