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Non-Linear Static Analysis of Multi Storeyed Building–A Modified Approach

Masihuddin Siddiqui 1 and N. Murali Krishna 2
1. C.E.D; Muffakham Jah College of Engineering & Technology
2. Former H.O.D, C.E.D; University College of Engineering; Osmania University

Abstract–The development in the computer application has helped the structural engineering field significantly. The amount of time and efforts required has decreased drastically with the development of civil engineering software. The Non linear Time history analysis of seismic evaluation of a structure is very precise, but tedious and requires a lot of data and human skill to perform. Research has been put in to develop Non-Linear Static Procedures which can yield results close enough to the NL-THA procedure In the present work Non Linear Static analysis (popularly known as push over analysis) is performed. Buildings with varying number of stories viz., 4, 8 and 12 stories are analysed by considering the real time time-history displacement and traditional displacement (4 % of height of the building) as monitored displacement. For obtaining the performance point of the buildings, the demand curves were also modified by considering the response spectra of Bhuj earth quake time history data. In the study, parameters such as displacements; base shear, performance point and status of the building are compared for different stories with this modified push over analysis approach. The modified approach gives better results when compared to conventional pushover analysis approach. From the said work it was found that the base shear in x-direction increases with time history displacement by 4%, 2% and 1% similarly in y-direction increases by 4%, 1.5% and 1% for 4, 8 and 12 respectively. However, this difference reduces as number of storeys increases. The buildings with real time demand curve falls under immediate occupancy level where as for conventional demand curve the building are falling under life safety level hence conventional demand curve method over estimate the performance level of the building.

Index Terms—linear time history analysis, non linear static analysis by (conventional) and (modified approach) SAP2000V15, Bhuj ground motion data, seismic coefficients, real time demand curve.

Cite: Masihuddin Siddiqui and N. Murali Krishna, "Non-Linear Static Analysis of Multi Storeyed Building–A Modified Approach," International Journal of Structural and Civil Engineering Research, Vol. 4, No. 2, pp.184-188, May 2015. doi: 10.18178/ijscer.4.2.184-188