EFFECT OF BASE ISOLATOR ON THE STRUCTURAL RESPONSE OF REINFORCED CONCRETE MULTISTORIED BUILDING UNDER SEISMIC LOADS
Abstract
This study investigates the effect of base isolator on the structural responses of multistoried reinforced concrete building under time history earthquake loading. In the present study, six-storied reinforced concrete buildings with both conventional and isolated bases have been modeled. Conventional building has been modeled with fixed support whereas base-isolated building has been modeled incorporating rubber bearing near the base of all columns. Modal analysis has been performed to get an idea of possible mode shapes of the building. After that time history analysis has been performed in order to investigate the effect of seismic loading on the building structure with respect to time. The structural responses of time history analysis such as time period of different modes, storey displacements, storey acceleration, and base shear have been obtained from both conventional and base-isolated buildings. Finally, a comparative study of structural responses has been carried out between those two structures. It has been found that fundamental time period of base-isolated building is increased by 28% compared to conventional building. Moreover, base shear value of the base-isolated structure is reduced by 69% and top storey acceleration is decreased by 75% compared to conventional building. This study reveals that isolation system reduces seismic responses significantly.
References
T.A. Arafat, A. Chowdhury, and S.M.A. Iqbal, 2015, The effect of base isolator on RC multistored building structure under seismic loading, B.Sc. Thesis, Department of Civil Engineering, Ahsanullah University of Science and Technology, Dhaka, Bangladesh.
Z. Tafheem, T. Ahmed, A. Chowdhury and A. Iqbal, Seismic isolation systems in structures- the state of art review, 11th Global Engineering, Science and Technology Conference, Dhaka, Bangladesh, Dec 2015.
I. G. Buckle, Passive control of structures for seismic loads, 12th World conference on earthquake engineering, 2000.
https://doi.org/10.5459/bnzsee.33.3.209-221
F. Naeim, and J.M. Kelly, 1999, Design of seismic isolated structures: from theory to practice, John Wiley and Sons, Inc. Design issues for base-isolated bridges: The 1997 Revised.
https://doi.org/10.1002/9780470172742
M Y. Nakamura, M. Saruta, A. Wada, T. Takeuchi, S. Hikone, and T. Takahashi, 2011, Development of the core-suspended isolation system, Earthquake Engineering and Structural Dynamics, pp. 429-447.
https://doi.org/10.1002/eqe.1036
M Y. Nakamura, T. Hanzawa, M. Hasebe, K. Okada, M. Kaneko, and M. Saruta, 2011, Report on the effects of seismic isolation methods from the 2011 Tohoku-Pacific earthquake, The Journal of the Anti-Seismic Systems International Society, 2(1).
https://doi.org/10.2140/siaps.2011.2.57
A.B.M.S. Islam, M.Z. Jumaata, R. Hussain, and M.A. Alam, 2013, Incorporation of rubber-steel bearing isolation in multi-storey building, Journal of Civil Engineering and Management,Vol.19(1).
https://doi.org/10.3846/13923730.2013.801904
ETABS nonlinear Version 15.2.0, Extended 3D analysis of the building systems, Computer and Structures Inc., Berkeley, California, USA.
A. B. M. S. Islam, M. Jameel, M. A. Uddin and S. I. Ahmad, 2011, Simplified design guidelines for seismic base isolation in multi-storey buildings for Bangladesh National Building Code (BNBC), International Journal of the Physical Sciences, Vol. 6(23), pp. 5467-5486.
A. B. M. S. Islam, M. Jameel and M. Z. Jummat, 2011, Study on optimal isolation system and dynamic structural responses in multi-storey buildings International Journal of the Physical Sciences, Vol. 6(9), pp. 2219-2228.
W.H. Robinson, 2011, Lead-rubber hysteretic bearings suitable for protecting structures during earthquakes, Seismic isolation and protection systems, Vol. 2(1), pp.5-19.
https://doi.org/10.2140/siaps.2011.2.5
P. Clemente and G. Buffarini, 2010, Base isolation: design and optimization criteria, Seismic isolation and protection systems, Vol. 1(1), pp.18-39.
https://doi.org/10.2140/siaps.2010.1.17
G. Warrier, K. Balamonica, K.S. Kumar, Dhanalakshmi, 2015, Study on laminated rubber bearing base isolators for seismic protection of structures, International Journal of Research in Engineering and Technology, Vol.4(2), pp.466-476.
https://doi.org/10.15623/ijret.2015.0402064
N.R. Chandak, 2013, Effect of base isolation on the response of reinforced concrete building, Journal of Civil Engineering Research, Vol.3(4), pp.135-142.
G. P. Warn, and K. L. Ryan, 2012, A review of seismic isolation for buildings: historical development and research needs, Buildings, Vol.2, pp.300-325.
https://doi.org/10.3390/buildings2030300
S.M. Kalantari, H. Naderpour and S.R. H. Vaez, Investigation of base-isolator type selection on seismic behavior of structures including story drifts and plastic hinge formation, The 14th World Conference on Earthquake Engineering, October 12-17, 2008, Beijing, China.
S.J.Patil, G. R. Reddy, 2012, State of art review -base isolation systems for structures, International Journal of Emerging Technology and Advanced Engineering, Vol.2(7), pp.438-453.
D.E. Nassani, and M.W. Abdulmajeed, 2015, Seismic base isolation in reinforced concrete structures, International Journal of Research Studies in Science, Engineering and Technology, Vol.2(2), pp. 1-13.
C. Xu, J. G. Chase, and G. W. Rodgers, 2014, Physical parameter identification of nonlinear base-isolated buildings using seismic response data, Computers and Structures, 145, pp. 47-57.
https://doi.org/10.1016/j.compstruc.2014.08.006
H. Monfared, A. Shirvani, S. Nwauban, 2013, An investigation into the seismic base isolation from practical perspective, International Journal of Civil and Structural Engineering, Vol.3(3), pp. 451-463.
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