comparative study on seismic behaviuor of rc bui … · 2017-05-24 · thickness of infill wall is...

http://www.iaeme.com/IJCIET/index.

International Journal of Civil Engineering and Technology (IJCIET)Volume 8, Issue 5, May 2017, pp.

Available online at http://www.iaeme.com/IJCIET/issues.

ISSN Print: 0976-6308 and ISSN Online: 0976

© IAEME Publication

COMPARATIVE STUDY ON

BEHAVIUOR OF RC BUI

WALL, INFIL

M.Tech Scholar, Department

Assistant Professor, Department of

ABSTRACT

During an earthquake, the high rise buildings are the strongly affected by the

rigidity and connections of floor. To resists the lateral loads most efficiently, the shear

wall, Infill wall, and bracings are normally provided to the RC frame building. In th

present investigation the performance of all the 3 systems is

Firstly, the shear wall, infill wall, and bracing systems are considered for same

structure. Linear static method and response spectrum method is adopted for the

study by using the software E

like base shear, lateral displacement, maximum displacement, storey drift and

stiffness and efficiency and time period of the RC building with shear wall, infill wall

and bracing system. Finally, concluded that the shear wall gives the best efficiency,

more strength and stiffness as compare to the other systems.

Key words: Shear wall, In

displacement, Storey drift, etc.

Cite this Article: Praveen R Pujar an

Behaviuor of RC Buildin

International Journal of Civil Engineering and Technology

http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=8&IType=5

1. INTRODUCTION

In the recent years, large number of

has been constructed in high seismicity

bracing, infill walls and shear walls are provided for RC building.

load and snow load these are the most

loads the building is subjected the lateral load caused by the earthquake and wind load and

these lateral loads are create high stress and produce the sway moment or vibration. Hence

IJCIET/index.asp 272 [email protected]

International Journal of Civil Engineering and Technology (IJCIET) 2017, pp.272–281, Article ID: IJCIET_08_05_031


6308 and ISSN Online: 0976-6316

Scopus Indexed

COMPARATIVE STUDY ON SEISMIC

BEHAVIUOR OF RC BUILDING WITH SHEAR

L, INFILL WALL AND BRACING

SYSTEM

Praveen R Pujar

Department of Civil Engineering ACSCE, Bengaluru, India.

S. Kavitha

Assistant Professor, Department of Civil Engineering, ACSCE Bengaluru



wall, Infill wall, and bracings are normally provided to the RC frame building. In th

present investigation the performance of all the 3 systems is analyzed



y using the software E-TABS. And comparing the various seismic parameters



tem. Finally, concluded that the shear wall gives the best efficiency,

more strength and stiffness as compare to the other systems.

Shear wall, In-fill wall, Bracing system, Base shear, Lateral

drift, etc.

Praveen R Pujar and S. Kavitha Comparative Study o

Building With Shear Wall, Infill Wall and Bracing System

Journal of Civil Engineering and Technology, 8(5), 2017, pp.


large number of the high-rise (RC) reinforced concrete

high seismicity of regions. And for the lateral force resisting the

bracing, infill walls and shear walls are provided for RC building. And Live load and wind

load and snow load these are the most common load from the gravity effect apart from these



[email protected]

asp?JType=IJCIET&VType=8&IType=5

SEISMIC

LDING WITH SHEAR

L WALL AND BRACING

neering ACSCE, Bengaluru, India.

ngineering, ACSCE Bengaluru, India.



wall, Infill wall, and bracings are normally provided to the RC frame building. In the

and compared.



TABS. And comparing the various seismic parameters



tem. Finally, concluded that the shear wall gives the best efficiency,

ing system, Base shear, Lateral

d S. Kavitha Comparative Study on Seismic

nd Bracing System.

, 8(5), 2017, pp. 272–281.


forced concrete frame buildings

. And for the lateral force resisting the

And Live load and wind

common load from the gravity effect apart from these



Comparative Study on Seismic Behaviuor of RC Building With Shear Wall, Infill Wall and Bracing

System

http://www.iaeme.com/IJCIET/index.asp 273 [email protected]

necessary to for the building have adequate stiffness and the sufficient strength is required

against the lateral load and vertical loads.

1.1. Shear wall

Generally shear wall can be defined as structural vertical member that is able to resist

combination of shear, moment and axial load induced by lateral load and gravity load transfer

to the wall from other structural member. Shear walls are a type of structural system that

provides lateral resistance to a building or structure. And Shear wall systems are one of the

most commonly used lateral load resisting systems in high rise buildings. Shear walls are

usually provided along both length and width of buildings, Shear walls are like vertically-

oriented wide beams that carry earthquake loads downwards to the foundation. In structural

engineering, a shear wall is a structural member it is composed of braced panels (known

as shear panels) to resist the effects of the lateral loads acting on the structure. Wind and

seismic loads are the most common loads that shear walls are designed to carry.

1.2. Infill Wall

Masonry infill typically consists of brick masonry or concrete block walls, constructed

between columns and beams of a RC frame Reinforced concrete (RC) frame buildings with

masonry infill walls have been widely constructed for commercial, industrial and multi-

family residential uses in seismic-prone regions worldwide. These panels are generally not

considered in the design process and treated as non-structural components. In country like

India, Brick masonry infill panels have been widely used as interior and exterior partition

walls for aesthetic reasons and functional needs.

1.3. Bracing

The bracing system to resist the lateral forces coming on the structure. And strengthen the

building. And bracing systems it helps to reducing the buckling of beam and columns and is

increased the strength and stiffness of the structure. The bracing systems in reinforced

concrete frames is a viable solution for resisting lateral forces. And bracing is economical,

easy to erect, occupies less space and has flexibility in design for meeting the required

strength and stiffness. And they are two types of bracing system is there like eccentric bracing

and concentric bracing system.

2. MODELING

In this present study a G+10 storey RC building frame is considered for analysis and the

analysis is done by the response spectrum method and linear static method according to

building is designed by IS: 456-2000 and IS: 1893-2002 the earth quake loads is applied.

2.1. Building Details

Plan dimension is 30m x 50m, each storey height is 3, each spacing of column is 5m, grade of

concrete of M30 characteristic of steel is Fe500 beam size is 200mmx300mm size of column

is 450mmx450mm. And thickness of slab is 175mm, thickness of shear wall is 150mm and

thickness of infill wall is 150mm and size of bracing is ISMB 600 and unit weight of concrete

is 25KN/m3 and unit weight of infill masonry wall is 20KN/m3 and live load is taken as

3KN/m2, floor finish is 1KN/m2.

Praveen R Pujar and S. Kavitha


2.2. Seismic load details

Type of structure (SMRF) and Response reduction factor (R) 5 and Damping of structure 5%

and Importance factor (I) 1 and Zone factor (Z) 0.24 and Soil type 2

Figure 2.1 Plan of shear wall Figure 2.2 3D view of shear wall

Figure 2.3 Plan of infill wall Figure 2.4 3D view of infill wall


System


Figure 2.5 Isometric view of Bracing

Figure 2.6 Elevation of bracing

3. RESULTS AND DISCUSSION

3.1. Base Shear

Base shear is an estimate of the maximum excepted lateral force that will occur due to

seismic ground motion at the base of a structure. Calculation of base shear depend on the soil

condition at the site.



Table 3.1 Base shear

Figure 3.1 Base shear in X direction

The Base shear graph is plotted storey level versus base shear in this present study the base

shear of shear wall is maximum as compare to the other infill wall and bracing system of

models and in the maximum base shear in shear wall is at first floor the valve is

3530.8288KN

3.2. Storey Drift

As per IS1893:2002 [2], the storey drift in any storey dueto minimum specified design force

shall not exceed 0.004 times the storey height.

0

500

1000

1500

2000

2500

3000

3500

4000

1 2 3 4 5 6 7 8 9 10

BA

SE

SH

EA

R

STOREY LEVEL

BASE SHEAR

STOREY LEVEL(m) BARE FRAME SHEAR WALL INFILL WALL BRACING

Storey level(m) Bare frame Shear wall Infill wall Bracing

1 3307.0663 3530.8288 3496.8779 3334.1872

2 3298.3411 3521.483 3487.6262 3325.3817

3 3263.4403 3484.0996 3450.6195 3290.1599

4 3184.9134 3399.987 3367.3545 3210.9107

5 3045.3101 3250.4536 3219.3279 3070.0233

6 2827.18 3016.8075 2988.0362 2849.8868

7 2513.0725 2680.3572 2654.9762 2532.8901

8 2085.5374 2222.4109 2201.6445 2101.4224

9 1527.1242 1624.2771 1609.5378 1537.8728

10 820.3825 867.2639 860.1528 824.6304


System


Table 3.2 storey drift

Storey Level(M) Bare Frame Shear Wall Infill Wall Bracing

Story1 0.001091 0.000188 0.00051 0.000621

Story2 0.001994 0.000357 0.00084 0.001073

Story3 0.0022 0.000475 0.000965 0.001251

Story4 0.002203 0.000567 0.001046 0.00136

Story5 0.002118 0.000629 0.001088 0.001411

Story6 0.001966 0.000665 0.001091 0.001407

Story7 0.001745 0.000679 0.001056 0.001354

Story8 0.001447 0.000674 0.000986 0.001255

Story9 0.001077 0.000656 0.000877 0.001115

Story10 0.000679 0.000612 0.000739 0.000913

Figure 3.2 Storey Drift in X direction

The storey drift graph is plotted between the storey height versus storey drift here the storey

drift is minimum in the shear wall model as compare to the masonry infill wall and bracing

system and storey drift valve in the shear wall at the first floor is 0.000188m and all the

storey drift valves are within the limits per clause no 7.11.1 of IS – 1893 (part-1): 2002.

0

0.0005

0.001

0.0015

0.002

0.0025

Story1 Story2 Story3 Story4 Story5 Story6 Story7 Story8 Story9 Story10

ST

OR

EY

DR

IFT

STOREY HEIGHT

STOREY DRIFT

BARE FRAME SHEAR WALL INFILL WALL BRACING



3.3 Lateral Displacement

The perpendicular distance between the direction of the incident ray and emergent ray is

called lateral displacement.

Table 3.3 lateral displacement in X direction

Storey level(m) Bare frame Shear wall Infill wall Bracing

Story1 0.003274 0.000563 0.001531 0.001862

Story2 0.009238 0.001603 0.003974 0.005073

Story3 0.015832 0.003022 0.006861 0.008822

Story4 0.02244 0.004722 0.009998 0.012897

Story5 0.028794 0.00661 0.013264 0.017125

Story6 0.034693 0.008607 0.016538 0.021342

Story7 0.039927 0.010642 0.019707 0.025399

Story8 0.044269 0.012666 0.022665 0.029159

Story9 0.0475 0.014633 0.025297 0.032503

Story10 0.049525 0.016332 0.027354 0.035241

Figure 3.3 lateral displacement in X direction

The lateral displacement is plotted between the storey heights versus lateral displacement

here the lateral displacement is minimum is in the shear wall compare to the other models like

bracing system and infill wall and lateral displacement in the shear wall valve is 0.000563m

at the first floor level. And as compare to bracing and infill wall in the infill wall have an less

displacement.

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

Story1 Story2 Story3 Story4 Story5 Story6 Story7 Story8 Story9 Story10LA

TE

RA

L D

ISP

LA

CE

ME

NT

STOREY HEIGHT

LATERAL DISPLACEMENT

BARE FRAME SHEAR WALL INFILL WALL BRACING

Comparative Study on Seismic Behaviuor


3.4. Storey stiffness

Table

Storey level bare frame

KN/m

Story1 1014230.391

Story2 552202.289

Story3 494652.818

Story4 481958.57

Story5 479272.654

Story6 479310.082

Story7 480185.889

Story8 480429.847

Story9 473263.839

Story10 404190.303

Fig

The storey stiffness graph is plotted between the storey level versus storey stiffness and here

the stiffness of shear wall is more compare to the other two bracing and infill wall model and

in the shear wall the storey stiffness valve is more as compare t

stiffness is more as compare to bracing system. And maximum valve of stiffness in shear wall

is 6483565.271 KN/m

0

1000000

2000000

3000000

4000000

5000000

6000000

7000000

0 2

ST

OR

EY

ST

IFF

NE

SS

STOREY STIFFNESS BY LINEAR STATIC ANALYSIS ALONG

bare frame

n Seismic Behaviuor of RC Building With Shear Wall, Infill Wall

System


Table 3.4 storey stiffness in X direction

bare frame shear wall

KN/m infill wall KN/m

6483565.271 2349778.702

3348451.933 1410942.22

2469267.632 1199309.938

2020162.931 1076694.089

1739350.619 988945.715

1526323.984 915762.878

1329253.235 841360.512

1109905.724 748604.255

835877.085 614880.572

491085.187 402741.278

Figure 3.4 storey stiffness in X direction



in the shear wall the storey stiffness valve is more as compare to infill wall, infill wall


4 6 8

STOREY LEVEL


X - AXIS

bare frame shear wall infill wall bracing

Building With Shear Wall, Infill Wall and Bracing

[email protected]

Bracing

KN/m

2216337.288

1225018.504

1041872.555

942526.342

873299.498

816113.581

757841.307

683541.933

570186.303

378861.112



o infill wall, infill wall


10 12



3.5. Time Period

Building Type Bare Frame (Sec)

Time Period 1.781

The time period graph is plotted between the building type versus time period here in the

shear wall model is having less time period comparing to the masonry infill wall and bracing

system. And the time period valve of the shear wall model is 0.928sec.

4. CONCLUSION

G+10 RC frame model with shear wall, infill wall and bracing system is

software. The following conclusion are made from the present study.

• The lateral displacement of the building is reduced by using the shear wall for RC

building as compare to the masonry infill wall and bracing system.

• The storey drift all results are safe within the limit as clause no. 7.11.1 of IS

1893(part-1):2002 and storey shear is less in shear wall model compare to the

other two model like masonry

• The base shear is maximum at the first floor in the shear wall as compare to the

masonry infill wall and bracing system.

• The time period is

like infill wall and br

• The shear wall model have an more efficiency and more strength compare to the

other models.

178%

0%

20%

40%

60%

80%

100%

120%

140%

160%

180%

200%

BARE FRAME (sec)

TIM

E P

ER

IOD



Table 3.4 Time period

Bare Frame (Sec) Shear Wall (Sec) Infill Wall (Sec)

0.928 1.252

Figure 3.5 Time period



system. And the time period valve of the shear wall model is 0.928sec.

G+10 RC frame model with shear wall, infill wall and bracing system is

software. The following conclusion are made from the present study.

The lateral displacement of the building is reduced by using the shear wall for RC


The storey drift all results are safe within the limit as clause no. 7.11.1 of IS

1):2002 and storey shear is less in shear wall model compare to the

other two model like masonry infill wall and bracing system.

The base shear is maximum at the first floor in the shear wall as compare to the

masonry infill wall and bracing system.

The time period is 30% less in the shear wall as compare to the other two model

like infill wall and bracing.

The shear wall model have an more efficiency and more strength compare to the

93%

125%

SHEAR WALL (sec) INFILL WALL (sec)

BUILDING TYPE

TIME PERIOD

[email protected]

Infill Wall (Sec) Bracing (Sec)

1.327



G+10 RC frame model with shear wall, infill wall and bracing system is analyzed using the

The lateral displacement of the building is reduced by using the shear wall for RC


The storey drift all results are safe within the limit as clause no. 7.11.1 of IS-

1):2002 and storey shear is less in shear wall model compare to the

The base shear is maximum at the first floor in the shear wall as compare to the

less in the shear wall as compare to the other two model

The shear wall model have an more efficiency and more strength compare to the

133%

BRACING (sec)


System


• The stiffness of building is more in the shear wall model and less in the infill wall

model and bracing system model.

REFERENCES

[1] Mohamad arif and prof. laxmikanth Y P and vinayak naircomparative study on seismic

analysis of multi-storey building stiffened with bracing and shear wall. International

Research Journal of Engineering and Technology (IRJET) Volume: 02 Issue: 05 | Aug-

2015.

[2] Lakshmi K.L and Proof Jayasree S and dr. Raju Kottallil and proof Mercy Joseph Effect

of shear wall location in buildings subjected to seismic loads ISOI journals Volume 1

Issue 1; Page No. 07-17.

[3] Ovidiu boleaa the seismic behaviour of reinforced concrete frame structures with infill

masonry in the Bucharest area science direct journals eenviro - yrc 2015, 18-20

November 2015.

[4] Md. Samdani azad1, syed haznicomparative study of seismic analysis of multi-storey

buildings With shear walls and bracing systemsinternational journal of advanced

structures issn 2319-5347, vol. 05, no. 03, July 2016.

[5] Rajshri A. Murade and Rafiz Shahezad Review on Seismic Response of Multi-Storied

RCC Building Infill with Masonry Infill and Steel Bracing ijesret journals issn 2935.

[6] Ghalimath A and waghmare Y M and zadbuke A and Chaudhary N seismic comparative

study of multi-storeyed r.c.c building with shear wall in bare frame and masonry infill

frame for various types of soil and seismic zones. (irjet) volume: 02 issue: 05 | aug-2015.

comparative study on seismic behaviuor of rc bui … · 2017-05-24 · thickness of infill wall is...

Documents