A DYNAMIC RESPONSE OF FRAMED STRUCTURES

Abstract

The following dissertation work "A DYNAMIC RESPONSE OF FRAMED STRUCTURES" deals with the response of framed structures subjected to earthquake loading. Response quantities implying displacement, velocity and acceleration are dealt with. The emphasis here is on RC framed structures. Two methods of analysis viz. Response Spectrum Analysis and Time History Analysis have been taken into consideration. A comparative study of the results obtained by both the methods has been carried out. The following assumptions have been made in this work; 1) The base of the structures has been assumed to be fixed. 2) The structural mass has been considered to be concentrated at the floor level. Though standard softwares like SAP, STAAD, etc. are available, coding in MATLAB has been used for the purpose of analysis to develop an understanding of the basic principles of dynamic analysis and implement the same in analyzing the framed structures. SAP has been used only in certain areas of the work where a comparison has to be done between the actual model and the idealized lumped mass model used in MATLAB. Rayleigh damping has been considered while using Time History Analysis. The programs developed have been validated by comparing the results obtained with the manual analysis. Codal provisions of the Indian Standards (IS: 1893(Part 1):2002), American Society of Civil Engineers (ASCE-7-02) and International Building Code (IBC-2006) have been studied in terms of earthquake effects.