State of art report on seismic response of setback profiles
Sagar P. Jain,  Dr. M. N. Bajad
From past earthquakes, it is proved that many of structure are totally or partially damaged due to the earthquake. So, it’s necessary to work out seismic responses of such buildings. Setback structures are extremely vulnerable throughout earthquakes due to its vertical geometrical and mass irregularity, but the vulnerability becomes higher if the structures also have stiffness irregularity in elevation. The risk issue of such structure could increase if the structure rests on sloping ground. It is the increasing demand of the time to construct the RCC Buildings in hilly regions due to urbanization. A short column of RC frame building serves damage because of attracting more forces during an earthquake. In this paper, an attempt is to evaluate the seismic performance of setback structures resting on the plain ground as well as in the slope of a hill with a lateral load resisting elements. The analysis is performing in two individual methods equivalent static method, response spectrum method, and extreme responses are to be recorded for various setback conﬁguration. In this paper works seismic analysis of RCC buildings with vertical irregularity at different floor level is carried out. This paper highlights the effect of vertical irregularity on-base shear carrying capacity of a structure, time period, story displacement and drift under the severe zone of India and analysis is done by using ETABS software. It is observed that for various configurations of setback frames, symmetric four-sided setback frame has given a better seismic performance of the building. It is found that the base shear obtained by the response spectrum method is higher than the equivalent static method.
Keywords- Base Shear, ETABS, Lateral load resisting elements, Setback, Response spectrum, Vertical irregularity.
Cite this Article
Sagar P. Jain,  Dr. M. N. Bajad,   "State of art report on seismic response of setback profiles"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.7, Issue 3, pp.446-460, August 2019, Available at :http://www.ijedr.org/papers/ IJEDR1903076.pdf