Effect of Seismic Retrofitting on R.C. Building with Soft Storey and Floating Column

Effect of Seismic Retrofitting on R.C. Building with Soft Storey and Floating Column

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2017 by IJETT Journal
Volume-46 Number-7
Year of Publication : 2017
Authors : Rahul Kapase, Mukund Pawar, M.M. Deshmukh, S.B.Talavara
DOI :  10.14445/22315381/IJETT-V46P262

Citation 

Rahul Kapase, Mukund Pawar, M.M. Deshmukh, S.B.Talavara "Effect of Seismic Retrofitting on R.C. Building with Soft Storey and Floating Column", International Journal of Engineering Trends and Technology (IJETT), V46(7),367-371 April 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract
The objective of this study is to identify an efficient retrofitting method for existing open ground story reinforced concrete frame buildings. This soft storey creates a major weak point in an earthquake. Since soft stories are classically associated with retail spaces and parking garages, they are often on the lower stories of a building, which means that when they collapse, they can take the whole building down with them, causing serious structural damage which may render the structure totally unusable. we are dealing with the comparative study of seismic analysis of multi-storied building with and without floating columns. The analysis is done with Response Spectrum Analysis, as per IS:1893-2002. Various features of lateral stiffness strengthening system, namely lateral bracings, shear walls, increasing the column size in the soft ground storey. the entire project is done with ETABS 3D model and the comparison of these models are been presented with their combinations, and are proposed to reduce the stiffness irregularity and discontinuity in the load path incorporated by the soft ground storey and the floating columns respectively. The results are plotted for both the frames with and without floating column by comparing each other in terms of Story shear, story displacement, story drift and time period.

 References

1) L. Teresa Guevara-Perez(2013), “Soft Story” and “Weak Story” in Earthquake Resistant Design: A Multidisciplinary Approach.” Universidad Central de Venezuela, Caracas.
2) Srikanth.M.K Yogeendra.R. Holebagilu (2014), “Seismic response of complex buildings with floating column for zone ii and zone v” ISSN 2348-7607 (Online) Vol. 2, Issue 2, pp: (12-23), Month: October 2014 - March 2015.
3) Mr. P.V. Prasad and T.RajaSekhar(2014), “Study of Behaviour of Seismic Analysis of Multi Storied building with and without floating column” T.Raja Sekhar et al, Carib.j.SciTech, 2014, Vol2, 697-710
4) Prof. Pravin B. Waghmare(2011), “A comparative study of retrofitting of R.C. building using Steel bracing and Infill wall” IJAERS/Vol. I/ Issue I/October-December, 2011/20- 23.
5) Umesh P. Patil and Shivanand S Hallur2 ( 2015), “Seismic Analysis of G+5 framed Structures with and Without Floating Columns Using ETABS-2013 Software” IRJET ,Volume: 02 Issue: 04 July-2015.
6) A. B. M. Saiful Islam, Mohammed Jameel (2011),“Study on corollary of seismic base isolation system on buildings with soft storey.” International Journal of the Physical Sciences Vol. 6(11), pp. 2654-2661, 4 June, 2011.
7) A.P. Mundada and S.G. Sawdatkar (2014), “Comparative seismic analysis of multi-storey building with and without floating column” E-ISSN 2277 – 4106, P-ISSN 2347– 516,Vol.4, No.5 (Oct 2014.
8) Sabari S, Mr.Praveen J.V(2014), “Seismic Analysis of Multistory Building with Floating Column” ISSN 2348- 7607 (Online) Vol. 2, Issue 2, pp: (12-23), Month: October 2014 - March 2015.
9) Hiroshi Komoto, Tatsuo Kojima, Yoshinori Mase, Wen(2004), “Case Study On The Soft-First-Story Buildings Strengthened By Confined Concrete Columns” 13th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 1-6, 2004 Paper No. 654.
10) Krishnaraj R. Chavan, H.S.Jadhav(2014), “Seismic Response of R C Building With Different Arrangement of Steel Bracing System” ISSN : 2248-9622, Vol. 4, Issue 7( Version 3), July 2014, pp.218-222.
11) Badgire Udhav S., Shaikh A.N., Maske Ravi G. (2015), “Analysis of Multistorey Building with Floating Column” Volume No.4, Issue No.9, pp : 475-478, ISSN:2319- 6890)(online),2347-5013(print) ,Sept. 2015.
12) Prof. Rekha Shinde Prof. Mukesh Shinde(2014), “Performance Based Seismic Analysis of a Building with Soft Storey” Volume 1, Issue 3, August 2014.
13) Dr. Saraswati Setia and Vineet Sharma(2012), “Seismic Response of R.C.C Building with Soft Storey” ISSN 0973- 4562 Vol.7 No.11 (2012).
14) Jonathan Buckalew, Bruce Maison, Brian McDonald(2015), “Case Studies of Soft-Story Retrofits Using Different Design Guidelines” December 2015.
15) Seval Pinarbasi, Dimitrios Konstantinidis, James M. Kelly(2007), “Seismic Isolation For Soft-Story Buildings” 10th World Conference on Seismic Isolation, Energy Dissipation and Active Vibrations Control of Structures, Istanbul, Turkey, May 28-31, 2007.
16) Anirudhha Banhatti(2016) “Seismic Retrofitting of Building with Soft Storey and Floating Column” Volume: 03 Issue: 07.
17) Gerardo Verderame, Flavia De Luca(2011), “Preliminary analysis of a soft?storey mechanism after the 2009 L`Aquila earthquake” Earthquake Engineering & Structural Dynamics · July 2011, Impact Factor: 1.95 · DOI: 10.1002/eqe.1069.
18) IS:456(2000), “Indian Standard code of Practice for Plain and Reinforced concrete”, bureau of Indian standard, New Delhi.
19) IS:875(1987) “Indian standard code of practice for structural safety of buildings: loading standard (other than Earthquake)”,bureau of Indian standards, New Delhi. 20) IS:1893(2000,Part 1),“Indian standard criteria for earthquake Resistance Design of Structure”, bureau of Indian standards, New Delhi.
21) A.R. Dar (2015)”Study on Seismic Vulnerability Assessment of a College Building in India” Volume 24 Number 4- June 2015.

Keywords
soft storey, floating columns, bracings, shear walls, ETABS.