Study of Behavior of the Soft Stories at Different Locations in the Multi-Story Building

Study of Behavior of the Soft Stories at Different Locations in the Multi-Story Building

Study of Behavo

r of the Soft Store

s at Df

ferent

Locato

ns n

the Mut

i-Story Budi

ing

Pavithra R

M.Tech (CADS), P.G Studen PES College of Engineering

Mandya Karnataka, India

Dr. T. M. Prakash Professor

PES College of Engineering

Mandya Karnataka, India

Abstract Present situation growth of Multi-story buliding is very high because of rapid urbanization all over the world. Open first story is generayl provdi ed for parking, receptoi n lobbies, communication halls or any purpose in mult-i story building. But

n case of earthquake multi-story buliding wti h soft story gvi es poor performance. There are varoi us factors effects on the behavoi r of multi-story buliding .i e. irregularti y in plan and

eel vatoi ns, uneven distributoi n of mass etc. Inflil wall in frame buldi ing provides stfi fness and improves the behavior of buldi ing

under al teral loads. In the present work, study on different ol cation of soft storei s are considered for the analyssi . To study of different location on the seismic behavoi r of multi-story

ground floor soft story during earth quake fail to resist the lateral earthquake forces. Since the distribution of the lateral forces in the high rise buildings is depend on the mass and the stiffness of the building. The soft story which has less stiffness depends upon the column to resist the lateral forces. Infill walls provide stiffness to the structures. And infill wall improves the seismic behaviour of structures. The opening provided in the masonry infill wall reduces the lateral strength

of the structures. Because of infill materials building improves resistance of lateral load.

buldi ing, lni ear dynamc analysis (Response spectrum anayl ssi )

II. AIM AND SCOPE OF THE STUDY

n ETABs software is carrei d out. Different seismc parameters

ilke time peroi d, story shear, story displacement and story drift are checked out. The sesi mc behavior of mutl i-story budli ing

1. Objecvit esohft epresenst tudy

   The objectives of the project are as listed below

   with soft stories s carrei d out. For that, G+14 (Reni forced

   cement concrete) RCC model is seel cted.

   Index Terms Dispal cement, Story Drfi , ETABSs, oftstory.

   Story Shear

   1. To study the optimum location of soft storey over the height of the building.

   2. To study the optimum location of multi soft storey over the height of the building.

   3. To obtain Displacement, Storey drift, Storey shear by

      1. INTRODUCTION

   Vast growth in the population in India is one of the main reasons for the construction of tall buildings in major cities. It

   is also the reason for the development of the country. Soft story is provided in the multi-story buildings depending on the needs of the occupants in the building. For Ex: providing car parking at the basement or the stories used for commercial purpose.

   A soft story is defined as If the story is lesser than 70% stiff than that of the story exactly above or lesser than 80% stiff as the average three story above it, is known as soft story. Due to the lesser stiffness in this story the lateral forces due to earthquake must be resisted by columns and if these columns are weak then this will lead to the severe damage or collapse of the building.

   The basic fundamental earthquake resistant design concept is the strong columns-weak beams criteria, so as to ensure safety of the occupants, i.e. during earthquake the beams yield before the columns get collapsed. The behaviour of the structure and degree of damages of the multi storeyed buildings depends on the capacity of structural members undergoing the process of deformations in elasticity during seismological ground motions. The collapse or the damage of the high rise building due to soft story is very often, the

   Response spectrum method.

2. PresentStudy

   Present study involves to find the optimum location of a single and a multi-soft story in a G+14 RCC tall building. The project is been carried out using the software ETABS 15.2.2. In total 6 models are created namely T1 to T6, out of which, T1, T2 & T3 are the models with single soft story at different locations in the building. T4, T5 & T6 are the models with multi soft story at different locations in the building. Analysis

   of each of the models were done and the results were compared with each other and the respective graphs were been obtained.

3. Scopeofht estudy

The purpose of this hypothetical study is to evaluate the seismic properties and characteristics for multi storey residential building structures. The main aspect of this analysis is to obtain the sustainability of the building regarding the performance of the buildings by using the aid of capacity and the demand of the structure for a designed strong motion earthquake characteristics using the response spectrum method.

1. TYPES OF MODELS

   T1: Model with single soft story at Ground floor of the building.

   T2: Model with single soft story at 8 th floor of the building. T3: Model with single soft story at 15 th floor of the building.

   T4: Model with multi soft story at Ground floor and 8 of the building.

   h floor

   T5: Model with multi soft story at 8 th floor and top of the building.

   T6: Model with multi soft story at ground floor and top of the building

2. MODELLING

   A.ModelDenif oiti n

   In this study we take a 15-storey RC building the geometrical parameters of the multi-story frame are as follows:

   Type of building – SMRF

   Number of stories – 15 stories Floor height of each story – 3m

   Base supports – Fixed

   Structural type – RCC Framed structure

   Grade of concrete – M30

   Grade of steel – Fe500

   Size of columns – 600mm x 600mm, 750mm x 750mm

   Size of beams – 230mm x 600mm

   Depth of slab – 175mm

   Wall thickness – 230 mm

   Live load – 2 kN/m 2 and 3 kN/m 2

   Floor finish – 1 kN/m 2

   Seismic zone – Zone V

   Importance factor – 1

   Reduction factor – 5

   Soil type – II

   Fgi . 2 3D rendered view

   Fgi . 1 Budil ni g Pal n

   Fgi . 3 Eel vaoti n of sni ge

   soft sot rey at ground fol or

   Fgi . 6 Eel vaoit n of muitl soft storey at ground and 8 h floor

   Fgi . 4 Eel vaoit n of sni ge soft sort ey at midde

   Fgi . 7 Eel vaoit n of muitl soft sot rey at 8 h and ot p floor

   Fgi . 5 Eel vaoti n of sni ge soft sot rey at top

3. RESULTS

   A study is done on the behavior of soft story at differen locations of a multistory building by response spectrum analysis. The response is calculated in term of displacement, story drift and story shear.

   Fgi . 10 Muitl soft sot rey dsi pal cement n X-direcoti n

   Fgi . 8 Sni ge

   soft storey dsi pal cement n

   X-dri ecoit n

   Fgi . 11 Muitl soft sot rey dsi pal cement n Y-direcoti n

   Fgi . 9 Sni ge

   soft storey dsi pal cement n

   Y-dri ecoit n

   Fgi . 12 Sni ge

   soft storey drfi t n

   X-direcoit n

   Fgi . 13 Singe

   soft sot rey drift in Y-direciot n

   Fgi . 16 Sni ge

   soft sot rey shear n

   X-dri ecoit n

   Fgi . 14 Muitl soft storey drfi t n

   X-dri ecoit n

   Fgi . 17 Sni ge

   soft sot rey shear n

   Y-dri ecoit n

   Fgi . 15 Muitl soft storey drfi t n

   Y-dri ecoit n

   Fgi . 18 Muitl soft storey shear n

   1. dr eciot n

      1. F. Heaj z,l

         S.Jali n,

         J.Noorzaei, C.Y.Chei ng, M.S.Jaafar, A.A.Abang

         Ail Effect of Soft Storey on srt ucut ral Response of Hgi h Rise

         Budli ings in IOP Conf. Serei s: Materai s December 2012 (012034)

         Scei nce and Engineerni g n

      2. Dr. Saraswait Seia and Vni eet Sharma Sesi mci Response of R.C.C

         Budli ing wthi

      3. A.S.Kasnae

         Soft Sot rey ISSN 0973- 4562 Vo.l 7 No.11 (2012)

         & Dr. S.S.Jamadar Sut dy of Sesi mic performance for

         soft basement of RC framed Budli ni gs, IOSR Journal of Mechanci a & cvi li Engineerni g, January 2013, ISSN: 2278-1684

      4. Prof Palit S.S. and Mr. Sagare S.D Dynamic Anayl ss of Soft Sort ey-

         Hgi h Rsi e Budli ni g whi Augus-t 2013

         Shear Wal

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         1 Issue 4,

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         budli ni gs at varoi us storei s by pushover Anayl ssi n Issue.3., June 2014, ISSN2: 321-7758

         IJOER Vo.l 2.,

      6. Devendra Dohare and Dr. Savta

         Maru Sesi mc

         Behavior of Sof

         Storey Budli ni g: Cricit al Revei w n IJERGS Volume 2, Issue 6,

         Fgi . 19 Muitl soft sot rey shear n

         Y-dri ecoit n

         November 2014, ISSN 2091-2730

      7. AbhishekArora Aetl rnavit e Approach o soft sort ey in seismic

         anayl ss of RCC budil ni g strucut res in IJCE April 2015, ISSN: 2348- 8352

4. CONCLUSION

1. Syed Mohammad Zakir Ail & Amaresha A Seismc

Anayl ss

of RC

[1] Comparison of single soft storey at different locations in the building is developed and it is found that the earthquake response is maximum in the model with sof

hgi h rsi e Strucut ral Budli ni g wht muitpl e soft sot rey at varoi us el ve

usni g ETABS in IJSRD Vo.l 3, Issue04, April 2015, ISSN: 2321-0613

[14] Abdul Rauf Muqeeb, Md Fasaul ddni , Shak Abdula Effect of sof sot reys n Earht quake ressati nt anayl ssi of RC framed srt ucut res n

storey at ground floor and minimum in the model with

soft storey at the top floor. From this one can say that the top soft storey will absorb more energy which results in the reduction of Earthquake response of the building.

[2] As the location of soft storey shifts to upper floors the

maximum lateral drift value decreases. In case of unavoidable conditions, soft storey should be provided in upper floor levels above middle floor heights to decrease

IJRET Voul me0: 5 Issue0: 3, March 2016, eISSN: 2319-1163, pISSN:

2321-7308

1. Pramod M Gabj e, Prof. R. V. R. K. Prasad Anayl sis of soft sot ry mu-itl sot reyed steel srt ucut re budli ni g, Internaiot nal Journal of

   Engni eerni g Scei nces & Research Technool gy, Gabj e et a.l , 5(7): Juyl , 2016.

2. P. B. Lamb and Dr. R. S. Londhe Sesi mc Behaviour of Soft Firs Storey, IOSR Journal of Mechanical and Cvi li Engineerni g, (IOSR- JMCE) ISSN: 2278-1684 Voul me 4, Issue 5 (Nov. – Dec. 2012), PP 28-33.

   the impact of soft-story .

3. Heti n L. Khen,i Anuj K. Chandw

aal , and Sesi mc

Response of RC

1. From the above it is seen that, when the effect of sof

   Budli ing wth Soft Sort ei s Inet rnaiot nal Journal of Engni eerni g

   storey is considered then the deflection has increase at that particular floor.

2. RC frame buildings with open first storeys are known to perform poorly during in strong earthquake shaking

3. The value of storey drift for all stories for all cases are found to be within permissible limit i.e. As per IS 1893:2002 they should not be more than 0.004 times to

Trends and Technool gy (IJETT), Voul me 10 Number 12 – Apr 2014 ISSN: 2231-5381.

1. Inet rnaoit nal Journal of Science, Engineerni g and Technool gy Research (IJSETR) Voul me 5, Issue 12, December 2016 ISSN: 2278 7798

2. IJRET: Inet rnaiot nal Journal of Research n Engni eerni g and Technool gy eISSN: 2319-1163 | pISSN: 2321-7308

3. Inet rnaoit nal Journal of Science, Engineerni g and Technool gy Research (IJSETR) Voul me 5, Issue 12, December 2016

   storey height of the structure

4. Anayl sis ht e Behavoi r of Budli ni g wth

   Voul me 2 /Issue 12 / 010)

   Dfi ferent Soft Sot ry (IJSTE

   ACKNOWLEDGEMENT

5. Inet rnaoit nal Research Journal of Engni eerni g and Technool gy (IRJET) e-ISSN: 2395 -0056 Voul me: 02 Issue: 08 | Nov-2015

   I express my deepest gratitude to my project guide Dr. T. M.

   Prakash and my HOD Dr. R. M. Mahalingegowda whose encouragement, guidance and support from the initial level to

   the final level enabled me to develop an understanding of the

6. Bureau of Indai n Standards: IS-1893, part 1 (2002), Creti rai earht quake ressi at nt design of srt ucut res: Part 1 General provisions and budli ni gs, New Dehl ,i India.

7. Bureau of Indai n sat ndards , Naoti nal budil ing code of Inda 2005

   for

   subject.

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