Seismic Analysis and Design Of Vertically Irregular RC Building Frames

Sharma , Ankesh and Bhadra, Biswobhanu (2013) Seismic Analysis and Design Of Vertically Irregular RC Building Frames. BTech thesis.



This paper is concerned with the effects of various vertical irregularities on the seismic response of a structure. The objective of the project is to carry out Response spectrum analysis (RSA) and Time history Analysis (THA) of vertically irregular RC building frames and to carry out the ductility based design using IS 13920 corresponding to Equivalent static analysis and Time history analysis.. Three types of irregularities namely mass irregularity, stiffness irregularity and vertical geometry irregularity were considered. According to our observation, the storey shear force was found to be maximum for the first storey and it decreases to minimum in the top storey in all cases. The mass irregular structures were observed to experience larger base shear than similar regular structures. The stiffness irregular structure experienced lesser base shear and has larger inter-storey drifts. The absolute displacements obtained from time history analysis of geometry irregular structure at respective nodes were found to be greater than that in case of regular structure for upper stories but gradually as we moved to lower stories displacements in both structures tended to converge. Lower stiffness results in higher displacements of upper stories. In case of a mass irregular structure, time history analysis gives slightly higher displacement for upper stories than that in regular structures whereas as we move down lower stories show higher displacements as compared to that in regular structures. High rise structure subjected to high frequency ground motion results in small displacements. Similarly, if a low rise structure is subjected to high frequency ground motion it results in larger displacements whereas small displacements occur when the high rise structure is subjected to low frequency ground motion

Item Type:Thesis (BTech)
Uncontrolled Keywords:vertical irregular buildings, Linear elastic analysis, Seismic design
Subjects:Engineering and Technology > Civil Engineering > Structural Engineering
Divisions: Engineering and Technology > Department of Civil Engineering
ID Code:5273
Deposited By:Hemanta Biswal
Deposited On:16 Dec 2013 10:58
Last Modified:16 Dec 2013 10:58
Supervisor(s):Biswal , K C

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