IRJET- Seismic Study of Conventional X Braced Frame, Zipper Frame and Sbs in Composite Structures using Etabs Software
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This document summarizes a study on the seismic performance of composite structures with different bracing systems using ETABS software. The study models G+6, G+12, and G+18 story composite structures with conventional X bracing, zipper bracing, and strong back system (SBS) bracing. Static and dynamic analyses are performed. The results show that zipper bracing significantly reduces lateral displacement in lower rise structures, while double spring SBS bracing provides the best seismic performance for higher rise structures by reducing base shear and roof displacement up to 95% compared to unbraced structures. SBS bracing is most effective for controlling seismic responses in medium and high-rise composite buildings.
![International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 3793
5. REFERENCES
1. Akhila lakshmi N H1, Swarthy S. Kumar (2013), Dynamic Analysis of an Irregular RC Building with Different
Bracing Systems, International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 .
2. Ali paseban, Jalal Jamali (2013), Investigation of the Seismic Behavior of Steel Structures with Zipper Braced
Frames, Technical Journal of Engineering and Applied Sciences.
3. Acxa Kuriakose et.al (2017), Comparative Study of X-Concentrically Braced Frame, Zipper Frame and Strong Back
System, International Journal of Innovative Research in Science, Engineering and Technology ,Vol. 6, Issue 5, May
2017
4 Adithya. M, Swathi Rani K.S(2015),Study On Effective Bracing Systems for High Rise Steel Structures, International
Journal of Civil Engineering (SSRG- IJCE) volume 2 Issue 2 February 2015.
5 Bhavin H. Zaveri et.al [2016], A Review on the Comparative Study of Steel, RCC and Composite Building, International
Journal of Innovative Research in Science, Engineering and Technology .Vol. 5, Issue 1, Januray 2016 .
6 Mayank Chouhan et.al (2017), Nonlinear Static Pushover Analysis of Steel Frame with Different Type of Bracing: A
Review, IJSRD - International Journal for Scientific Research & Development Vol. 5, Issue 02, 2017.
7 M. Pour babaa, M. Reza bagerzadeh K, et.Al (2013) ,Behavior of Zipper Braced Frame (ZBF) compared with other
Concentrically Braced Frame (CBF), International Journal of Current Engineering and Technology.
8 Prof. Bhosle ashwini tanaji, Prof. Shaikh A. N. (2015), Analysis of Reinforced Concrete Building with Different
Arrangement of Concrete and Steel Bracing system, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)e-ISSN:
2278-1684,p-ISSN: 2320- 334X, Volume 12, Issue 5.
9 Prof. Prakarsh SangaV(2015) Comparative Study of Analysis and Design of R.C. and Steel Structures, International
Journal of Scientific & Engineering Research, Volume 6, Issue 2, February-2015
10 Sachin dhiman, Mohammed Nauman (2015) , Behaviour of Multistory Steel Structure with Different Types of
Bracing Systems, International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319-183X, (Print)
2319-1821.
11 Viswanath K.G et.al.(2010),Seismic Analysis of Steel Braced Reinforced ConcreteFrames ,International journal of
civil and structural engineering Volume 1, No 1, 2010 .](https://image.slidesharecdn.com/irjet-v5i3887-190206082211/85/IRJET-Seismic-Study-of-Conventional-X-Braced-Frame-Zipper-Frame-and-Sbs-in-Composite-Structures-using-Etabs-Software-4-320.jpg)
IRJET- Seismic Study of Conventional X Braced Frame, Zipper Frame and Sbs in Composite Structures using Etabs Software
- 1. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 3790 SEISMIC STUDY OF CONVENTIONAL X BRACED FRAME, ZIPPER FRAME AND SBS IN COMPOSITE STRUCTURES USING ETABS SOFTWARE Safvana p1, Mrs Anila s2 1P.G. Student, Department of Civil Engineering, AWH Engineering College, Kozhikode, Kerala, India 2Assistant Professor, Department of Civil Engineering, AWH Engineering College, Kozhikode, Kerala, India -----------------------------------------------------------------------***----------------------------------------------------------------------- Abstract : steel braced frame is one of the structural systems used to resist earthquake loads in multistoried buildings. Many existing reinforced concrete buildings need retrofit to overcome deficiencies to resist seismic loads. The use of steel bracing systems for strengthening or retrofitting seismically inadequate reinforced concrete frames is a viable solution for enhancing earthquake resistance. Steel bracing is economical, easy to erect, occupies less space and has flexibility to design for meeting the required strength and stiffness. In the present study, the seismic study of conventional x brace, zipper brace and SBS in composite structures using ETABS software is investigated. The bracing is provided at each corner. a G+6, G+12 and G+18 story with 6 bay in x direction and 3 bay in y direction is analyzed using ETABS.. The effectiveness of various types of steel bracing is examined. The effect of the distribution of the steel bracing along the height of the composite structure on the seismic performance of the rehabilitated building is studied. Provision of conventional x braced, zipper braced and SBS is provided in each stories. The percentage reduction in lateral displacement is found out. It is found that the zipper of steel bracing significantly contributes to the reduction in displacement and SBS contributes in the reduction of story shear compared to conventional x bracings. Keywords : x brace, zipper brace , spring back system , ETABS 2016 , time history analysis 1 INTRODUCTION Steel framed construction is a new concept in which Lateral loads are better resisted by bracings. Buckling in braces can be restrained by ZIPPER AND STRONG BACK SYSTEM(SBS). The main advantages of braces are higher strength, Stiffness, economy, occupies less space and less weight. Steel bracing is a highly efficient and economical method of resisting horizontal forces in a frame structure. A bracing system improves the seismic performance of the frame by increasing its lateral stiffness and capacity. • Through the addition of the bracing system, load could be transferred out of the frame and into the braces, bypassing the weak columns while increasing strength. Steel bracing is a highly efficient and economical method of resisting horizontal forces in a frame structure. • A bracing system improves the seismic performance of the frame by increasing its lateral stiffness and capacity. • Through the addition of the bracing system, load could be transferred out of the frame and into the braces, bypassing the weak columns while increasing strength. Static and dynamic analysis is done using ETABS 2016 software. Figure 1. conventional and SBS bracing
- 2. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 3791 2 METHODOLOGY Modeling of G+6 story steel structure providing ; I. Without bracing (WB) II. With x bracing (XB) III. With zipper bracing(ZB) IV. With SBS (1.Typical double-story X (DS X) 2.Intermittent chevron (IC) 3. Shifted double-story X (S DS X) 4. Tied-to-ground with single spring (SS) 5. Tied-to-ground with double spring (DS) ) Modeling of G+12 story steel structure providing ; 1. With zipper bracing (ZB) 2. Tied-to-ground with double spring (DS) 3. With x bracing (XB) Modeling of G+18 story steel structure providing ; 1. With zipper bracing (ZB) 2. Tied-to-ground with double spring (DS) 3. With x bracing (XB) Static and dynamic analysis of composite structures. Figure 1: Eight different models of steel structures for G+6 storey provided with their names are shown
- 3. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 3792 3.EXPERIMENTAL RESULT Table 1: G+6 storey composite structures 4.CONCLUSIONS The double spring SBS bracing with increased stiffness were found to be excellent seismic control device for controlling forced responses such as base shear, roof displacement and storey drift for lower rise, medium rise and high rise steel structures. Base shear decreased in double spring SBS up to 47.85% compared to zipper braced. Roof displacement in zipper braced decreased up to 20.9% compared to X braced Value of drift as per IS 1893:2002 should not be greater than 0.004 times the storey height which is within the limit. Roof displacement in double spring SBS is higher compared to zipper brace, hence soft storey mechanism is produced. As the stiffness is increased , soft storey effect is minimized and also the displacement is reduced. Roof displacement in double spring SBS decreased up to 95% when compared to structure without bracings. As moving from lower rise structure to high rise structure, maximum roof displacement is reduced in case of double spring SBS bracings. So for high rise structures(G+18), it is better to provide these bracings. As moving from lower rise structure to high rise structure, maximum roof displacement is increased in case of zipper braced . So for lower rise(G+6) structures, it is better to provide these bracings. As moving from lower rise structure to high rise structure, maximum base shear is decreased in all case of braced stuctures . So it is better option for providing SBS with double spring bracings to high rise buildings for steel structures.
- 4. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 03 | Mar-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 3793 5. REFERENCES 1. Akhila lakshmi N H1, Swarthy S. Kumar (2013), Dynamic Analysis of an Irregular RC Building with Different Bracing Systems, International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 . 2. Ali paseban, Jalal Jamali (2013), Investigation of the Seismic Behavior of Steel Structures with Zipper Braced Frames, Technical Journal of Engineering and Applied Sciences. 3. Acxa Kuriakose et.al (2017), Comparative Study of X-Concentrically Braced Frame, Zipper Frame and Strong Back System, International Journal of Innovative Research in Science, Engineering and Technology ,Vol. 6, Issue 5, May 2017 4 Adithya. M, Swathi Rani K.S(2015),Study On Effective Bracing Systems for High Rise Steel Structures, International Journal of Civil Engineering (SSRG- IJCE) volume 2 Issue 2 February 2015. 5 Bhavin H. Zaveri et.al [2016], A Review on the Comparative Study of Steel, RCC and Composite Building, International Journal of Innovative Research in Science, Engineering and Technology .Vol. 5, Issue 1, Januray 2016 . 6 Mayank Chouhan et.al (2017), Nonlinear Static Pushover Analysis of Steel Frame with Different Type of Bracing: A Review, IJSRD - International Journal for Scientific Research & Development Vol. 5, Issue 02, 2017. 7 M. Pour babaa, M. Reza bagerzadeh K, et.Al (2013) ,Behavior of Zipper Braced Frame (ZBF) compared with other Concentrically Braced Frame (CBF), International Journal of Current Engineering and Technology. 8 Prof. Bhosle ashwini tanaji, Prof. Shaikh A. N. (2015), Analysis of Reinforced Concrete Building with Different Arrangement of Concrete and Steel Bracing system, IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)e-ISSN: 2278-1684,p-ISSN: 2320- 334X, Volume 12, Issue 5. 9 Prof. Prakarsh SangaV(2015) Comparative Study of Analysis and Design of R.C. and Steel Structures, International Journal of Scientific & Engineering Research, Volume 6, Issue 2, February-2015 10 Sachin dhiman, Mohammed Nauman (2015) , Behaviour of Multistory Steel Structure with Different Types of Bracing Systems, International Refereed Journal of Engineering and Science (IRJES) ISSN (Online) 2319-183X, (Print) 2319-1821. 11 Viswanath K.G et.al.(2010),Seismic Analysis of Steel Braced Reinforced ConcreteFrames ,International journal of civil and structural engineering Volume 1, No 1, 2010 .