Seismic Analysis of Buildings Symmetric & Asymmetric in Plan

International Journal of Civil Engineering

© 2016 by SSRG - IJCE Journal

Volume 3 Issue 5

Year of Publication : 2016

Authors : B K Raghuprasad, Vinay S, Amarnath.K

10.14445/23488352/IJCE-V3I5P135

How to Cite?

B K Raghuprasad, Vinay S, Amarnath.K, "Seismic Analysis of Buildings Symmetric & Asymmetric in Plan," SSRG International Journal of Civil Engineering, vol. 3,  no. 5, pp. 24-28, 2016. Crossref, https://doi.org/10.14445/23488352/IJCE-V3I5P135

Abstract:

Structural asymmetry can be a major reason for the poor performance of buildings under severe seismic loading, Asymmetry contributes significantly for translational-torsional coupling in the seismic response which can lead to increased lateral deflections, increased member forces and ultimately collapse. In this paper the inelastic seismic behaviour of symmetric and asymmetric single & multi-storied buildings are studied. The effects of torsion on buildings are investigated. There is an increase in shear in columns and the rotation of columns need some special attention. Although seismic response of building asymmetric in the plan has been studied in the past in great detail, the contribution of the torsional resistance of the individual columns in total torsional response is not well understood. In order to study that, in the present work a single storey structure (asymmetric plan) with three degrees of freedom is modelled in two ways, viz. Once with column replaced by springs and next with columns modelled is they are. In the latter case the torsional rotation of individual columns can be obtained while in the former case, it is not possible. Considerable difference between the two responses is observed. Further a 11 storey building with eccentricity same on all the floors (uniform eccentricity) and the other with eccentricity varying over the floors have been subjected to EL-Centro 1940 N-S component ground motion input and the responses like spectral displacement, spectral acceleration, spectral velocity are obtained is there considerable difference between the two

Keywords:

Symmetric & Asymmetric buildings, spring model, base shear, time history, spectral acceleration, spectral displacement, spectral velocity.

References:

[1] Lucchini Andrea, Monti Giorgio and Kunnath Sashi. - Non linear response of two way asymmetrical single storey building under bi-axial excitation. Journal of structural engineering, ASCE (January, 2011), 137(1), pp. 34-40
[2] Julio J HERNÁNDEZ, Oscar A LÓPEZ, - Influence of Bidirectional Seismic Motion on the Response of Asymmetric Building by 12 World Conference on Earthquake Engineering, 2000, 1813, pp. 1-8
[3] Dorde Ladinovic, - Nonlinear seismic analysis of asymmetric in plan building by FACTA UNIVERSITATIS: Architecture and Civil Engineering Vol. 6, No 1, pp. 25 – 35, 2008,
[4] Raúl González Herrera1, Consuelo Gómez Soberón, - Influence of Plan Irregularities of Buildings by 14th World Conference on Earthquake Engineering, 2008,
[5] Andrea Lucchini, Giorgio Monti, Enrico Spacone, - Asymmetric-Plan Building: Irregularity Levels and Nonlinear Seismic Response by E.Cosenza (ed), Eurocode 8 Perspectives from the Italian Standpoint Workshop, pg 109- 117, Doppiavoce, Napoli, Italy, 2000
[6] N. Özhendekci, Z. Polat, - Torsional Irregularity of Buildings by 14 World Conference on Earthquake Engineering, 2008,
[7] Rucha S. Banginwar, M. R. Vyawahare, P. O. Modani, - Effect of Plan Configurations on the Seismic Behaviour of the Structure by Response Spectrum Method by International Journal of Engineering Research and Applications(IJERA), May-June 2012, 2(3), pp. 1439-1443
[8] Christos A. Zeris, Stephen A. Mahin, - Behaviour of Reinforced Concrete Structures Subjected to Biaxial Excitation by Journal of Structural Engineering (ASCE), Sept 1991, 117(9), pp. 2657-2673
[9] Christos A. Zeris, Stephen A. Mahin, - Behaviour of Reinforced Concrete Beam-Columns under Uniaxial Excitation by Journal of Structural Engineering (ASCE), April 1998, 114(4), pp. 804-820
[10] H. P. Hong, - Torsional Responses under Bi-Directional Seismic Excitations: Effects of Instantaneous Load Eccentricities by Journal of Structural Engineering (ASCE), March 2012,
[11] Juan C. De La Llera, Anil K. Chopra, - Estimation of Accidental Torsion Effects for Seismic Design of Buildings by Journal of Structural Engineering (ASCE), Jan 1995, 121(1), pp. 102-114
[12] Czeslaw Bajer, - Time Integration Methods – Still Questions by Theoretical Foundations of Civil Engineering, Warsaw, 2002, pp.45-54
[13] S. J. Patil, - Seismic Response of Asymmetric Buildings by International Journal of Latest Trends in Engineering and Technology (IJLTET), Vol. 2 Issue 4 July 2013, pp. 365-369
[14] Dj. Z. Ladjinovic and R. J. Folic, - Seismic analysis of asymmetric in plan buildings, The 14th World Conference on Earthquake Engineering October 12-17, 2008, Beijing, China.
[15] Raghu Prasad B K and Saibaba S, - Influence of shape in plan of building on the inelastic earthquake response, Proceeding of 8th European conference on earthquake engineering, Libson, Portugal, pp 17-24, September 7-12,1986.
[16] Raghu Prasad B K and Jagadish K S, - Inelastic torsional response of a single storey framed structure, Journal of engineering mechanics, ASCE, vol.115, number 08, pp 1782- 1797, August 1989.
[17] M. Shahrouzi and A.A. Rahemi - Improved seismic design of structural frames by optimization of equivalent lateral load pattern, International Journal of Civil Engineering, Vol. 12, No. 2, pp 256-267, Transaction A: Civil Engineering, June 2014.