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Seismic Analysis and Design of Vertically Irregular Mutistoried RC Concrete Building using Staad Pro V8i

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Seismic Analysis and Design of Vertically Irregular Mutistoried RC Concrete Building using Staad Pro V8i


Anjali Raw | Ashish Verma



Anjali Raw | Ashish Verma "Seismic Analysis and Design of Vertically Irregular Mutistoried RC Concrete Building using Staad Pro V8i" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1, December 2019, pp.237-242, URL: https://www.ijtsrd.com/papers/ijtsrd29518.pdf

This paper is concerned with the effects of a variety of 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 study and Time history analysis. Comparison of the results of analysis and design of irregular structures with regular structure was done. The scope of the project also includes the evaluation of response of structures subjected to high, low and intermediate frequency content earthquakes using Time history analysis. Three types of irregularities namely mass irregularity, stiffness irregularity and vertical geometry irregularity were measured. According to our examination the storey shear force was found to be maximum for the first storey and it decreases to minimum in the peak storey in all cases. The mass irregular structures were observed to occurrence larger base shear than similar regular structures. The stiffness irregular structure experienced lesser base shear and has larger inter-storey drifts. The total displacements obtained from time history analysis of geometry irregular structure at respective nodes were found to be larger than that in case of regular structure for high stories but steadily as we moved to lower stories displacements in both structures tended to congregate. Lower stiffness results in higher displacements of upper stories. In case of a mass irregular structure, time history analysis gives a little 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. When time history analysis was done for regular as well as stiffness irregular structure, it was found that displacements of upper stories did not vary much from each other but as we moved down to lower stories the total displacement in case of soft storey were higher compared to respective stories in regular structure. High structures were found to have low natural frequency hence their response was found to be maximum in a low frequency earthquake. It is because low natural frequency of tall structures subjected to low frequency earthquake leads to resonance resulting in larger displacements. If a high rise structure (low natural frequency) is subjected to high frequency ground motion then it results in small displacements. Similarly, if a low rise structure (high natural frequency) is subjected to high frequency ground motion it results in larger displacements whereas small displacements arise when the high rise structure is subjected to low frequency ground motion.

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IJTSRD29518
Volume-4 | Issue-1, December 2019
237-242
IJTSRD | www.ijtsrd.com | E-ISSN 2456-6470
Copyright © 2019 by author(s) and International Journal of Trend in Scientific Research and Development Journal. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0) (http://creativecommons.org/licenses/by/4.0)

International Journal of Trend in Scientific Research and Development - IJTSRD having online ISSN 2456-6470. IJTSRD is a leading Open Access, Peer-Reviewed International Journal which provides rapid publication of your research articles and aims to promote the theory and practice along with knowledge sharing between researchers, developers, engineers, students, and practitioners working in and around the world in many areas like Sciences, Technology, Innovation, Engineering, Agriculture, Management and many more and it is recommended by all Universities, review articles and short communications in all subjects. IJTSRD running an International Journal who are proving quality publication of peer reviewed and refereed international journals from diverse fields that emphasizes new research, development and their applications. IJTSRD provides an online access to exchange your research work, technical notes & surveying results among professionals throughout the world in e-journals. IJTSRD is a fastest growing and dynamic professional organization. The aim of this organization is to provide access not only to world class research resources, but through its professionals aim to bring in a significant transformation in the real of open access journals and online publishing.

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