Stability of High Rise Building using Shear Wall By ETABs

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Stability of High Rise Building using Shear Wall By ETABs

Prathamesh P. Mohite1, Shubham B. Sonawane2, Chinmay R. Thatte3, Omkar B. Udeg4, Dr. Amardeep D. Bhosale5

1,2,3,4 UG Student, Department of Civil Engineering, Gharda Institute of Technology, Lavel – Khed, Ratnagiri -Maharashtra, India.

5 Associate Professor, Department of Civil Engineering, Gharda Institute of Technology, Lavel- Khed, Ratnagiri-Maharashtra, India.

Abstract- Developments of high rise building in present time takes new elevation day by day, but also create huge challenge for the structure engineering in present time. Shear walls are normally made of reinforced concrete, plywood (timber), unreinforced masonry. Generally, concrete used for construction of shear wall. Normally, shear walls include in stairwells between columns, lift well, toilets, utility shafts etc. Todays tall buildings are becoming more and more slender, leading to the possibility of more sway in comparison with earlier high rise buildings. Now in a days, increase in the transportation and safety measure the Floor Spacing Index ( FSI ) in Indian cities is increasing considerably. Lateral forces of wind and earthquake are usually resisted by shear walls which are parallel to the direction of lateral load. These shear walls, by their shearing resistance and resistance to overturning, transfer the lateral loads to the foundation. The primary aim is to review about G+15 storey high-rise building with shear wall system and without shear wall system located in seismic zone IV, shear wall design and optimization is done by using the ETAB software and the shear walls are arranged in such a way to resist the lateral forces in zone IV region throughout the structure according to Indian codes..

Indexed Terms- High Rise Building, Shear Wall, Earthquake, Seismic Zone, Storey Drift, Peak Displacements, Base Shear.

  1. INTRODUCTION

    easier to design or analyse the model of such seismic structure using various software like ETABS.

      1. Aim and Objectives of the project are as follows: Aim of the work is-

        • To compare and review behavior of G+15 storey high-rise building with and without shear wall system.

        • Objectives of the work are :

        • To study the effectiveness of shear wall as lateral load resisting system.

        • To Find and Compare the nonlinear dynamic response of building in terms of Peak Displacements, Model Time period, Base shear, Inter-storey Drift, for building with shear wall & without shear wall.

  2. METHODOLOGY AND MATERIAL

    3D models of two different forms of structural systems are being modelled in the present research in seismic zone IV and compare the performance with shear wall and without shear wall structures subjected to Earthquake structural forces. All versions have dimensions of the same structural plan.

    Table 1 Model description

    Sr.

    No.

    Structural Part

    Dimension

    1.

    Number of Storey

    G +15 upper floors

    2.

    Storey height

    3.0 m for all storeys

    3.

    Thickness of shear wall

    300 mm

    4.

    Thickness of floor slabs

    125 mm

    5.

    Thickness of Lift wall

    230 mm

    6.

    Grade of beam ,column ,wall and slab

    M30

    7.

    Compressive strength of concrete

    30 N/mm²

    8.

    Size of Columns

    300 mm X 750 mm

    9.

    Size of Beams

    300 mm X 600 mm

    10.

    Live load

    2 kN/m²

    11.

    Floor finish

    1.5 kN/m²

    12.

    Seismic zone

    IV

    13.

    Zone factor (Z)

    0.24

    14.

    Type of soil

    Hard

    15.

    Important Factor (I)

    1.2

    16.

    Poissons ratio

    0.2

    17.

    Density

    25 kN/m³

    18.

    Modulus of Elasticity

    5000 fck

    : 27.386×10³ N/mm² for M30

    1.General-

    India has had a number of the world's greatest earthquakes in the last century. More than 50% area in the country is considered as prone to damaging earthquakes. . Earthquake causes the shaking of the ground. Earthquake creates horizontal pressure on building causing them to collapse. Due to earthquake shaking of the ground occurs resulting the motion of the base of the building on it. Even though there is movement of base of building with the ground, the roof has a tendency to remain in its original position along with these columns can bend, the swaying motion of building frame or when the intensity of earthquake is extreme the building may get collapsed. To prevent this loss structure with seismic members or seismic structures are constructed. Seismic structure design is an important process of structural analysis while designing a building, which is subjected to Earthquake, such that the structure continues to function and serve its purpose even after an Earthquake. Shear wall systems are commonly used lateral-load resisting systems in high-rise buildings. Shear walls have very high in-plane stiffness and strength, which can be used to simultaneously resist large horizontal loads and support gravity loads, making them quite efficient in many structural engineering applications. It is

    Fig. 1 shows structure without shear wall. Shear wall at corners, Lift, Partition wall as shown in Fig.2. As per IS 456:2000 and IS 1893:2002 both structures were analysed by using ETAB 2015.

    Fig 1: Structure without shear wall in Etabs.

    Fig 2: Structure with shear wall in Etabs.

    3 (a) 3 (b)

    Fig.3(a) Structure without shear wall & Fig. 3 (b) shows structure with shear wall

  3. RESULTS

The G+15 storey building models design with shear wall and without shear wall were analyzed using ETABs 2015

software to find difference in time period ,base shear , story drift ,displacement between the models.

Time Period

Time Period (Sec)

2.5

1.981

2

1.625

1.5

1

0.5

0

Without Shear Wall With Shear Wall

Fig 4: Time period (Sec)

The Time Period of structure having shear wall is reduced as compared to structure without shear wall.

Base shear

1400

1200

1000

800

600

400

200

0

Base Shear (KN)

1199.8

1090.2

947.8

855.5

EQX

EQY

Without Shear Wall With Shear Wall

Fig 5 : Base Shear (KN)

(No of Story)

The structure without shear wall has less base shear as compared to structure having shear wall.

18

16

14

12

10

8

6

4

2

0

Without Shear Wall With Shear Wall

0 10

20

Displacement (mm)

30

40

Fig 6(a) : EQ Displacement along X-direction..

Without Shear Wall

With Shear Wall

18

16

14/p>

12

10

8

6

4

2

0

Fig 6(b) : EQ Displacement along Y-direction

(No of Story)

As shown in above fig.6(a) & fig.6(b) the EQ displacement of building without shear wall increases with respect to increase in no. of storey in X and Y direction respectively. The EQ displacement of building having shear wall is not greater than building without shear wall in X and Y direction respectively.

18

16

14

12

10

8

6

4

2

0

Without Shear Wall

With Shear Wall

0 5

10

Displacement (mm)

15

20

(No of Story)

Fig 7(a): Wind Displacement along X-direction

18

16

14

12

10

8

6

4

2

0

Without Shear Wall With Shear Wall

0 5 10 15 20 25 30

Displacement (mm)

Fig 7(b) : Wind Displacement along Y-direction

The wind displacement of building having shear wall is less than building without shear wall with increase in no. of storey in X-direction as shown in fig.7(a).

The wind displacement of building having shear wall is less than building without shear wall with increase in no. of storey in Y-direction as shown in fig.7(b).

Without Shear Wall

With Shear Wall

0 5

10

Displacement (mm)

15 20

25

30

18

16

14

12

10

8

6

4

2

0

0 0.5

1 1.5

Story Drift

2

2.5

3

(No of Story)

(No of Story)

(No of Story)

Fig. 8(a): EQ Story drift along X-direction

Without Shear Wall

With Shear Wall

18

16

14

12

10

8

6

4

2

0

0 0.5

1

Story Drift

1.5

2

Fig 8(b) : EQ Story drift along Y-direction

As shown in above in fig.8(a) & fig.8(b) the storey drift of building without shear wall is first increase and then slowly decreased with increased in no. of storey in X & Y both direction.

The storey displacement in X & Y of building with shear wall is slowly increased and then decreased as compared to building without shear wall in X & Y both direction.

Type of Load

Building without shear wall

Building with shear wall

Time Period (Sec)

1.981

1.625

Base Shear (KN) along X- direction

855.5

1090.2

Base Shear (KN) along Y- direction

947.8

1199.8

EQ Displacement (mm) along X-direction

33.504524

17.63

EQ Displacement (mm) along Y-direction

24.93

16.96

Wind Displacement (mm) along X-direction

15.06

5.11

Wind Displacement (mm) along Y-direction

27.76

4.68

EQ Story drift along X- direction

1.005

0.987

EQ Story drift along Y- direction

0.942

0.897

Table 2 Response Parameters

CONCLUSION

From the analysis it was concluded that-

  1. Due to addition of shear wall increases the stiffness of the building resulting in reducing the time period of the building with shear wall by 18% as compared to the building without shear wall.

  2. Due to increasing in stiffness in response the base shear for the building with shear wall is increased by 21% than the building without shear wall.

  3. Introducing shear wall in building increases lateral stiffness of the building when subjected to lateral forces i,e EQ &Wind Resulting in the peak EQ displacements of the building are reduced by 52.62% & 68.03% in X & Y directions respectively as compared to building without shear.

  4. Introducing shear wall in building increases lateral stiffness of the building when subjected to lateral forces i,e EQ &Wind Resulting peak WIND displacements of the building with shear wall are reduced by 33.93% & 16.85% in X & Y directions respectively as compared to building without shear.

  5. Introducing shear wall in building increases lateral stiffness of the building when subjected to lateral forces Resulting the peak EQ story drifts of the building with shear wall in X & Y directions are reduced by 98.20% & 95.23% respectively as compared to building without shear.

From above results we can conclude that shear wall in building reduces maximum displacement, base shear and story drift as compared to building without shear. Building with shear wall performs better when subjected EQ & WIND loading when compared to building without shear wall.

ACKNOWLEDGEMENT

We are thankful to our guide Dr. Amardeep D. Bhosale in Civil Engineering Department for his constant encouragement, able guidance and continuous support in making this work complete.

REFERENCES

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[15] IS: 456 – 2000 Code of Practice for Plain and Reinforced Concrete, Bureau of Indian Standards, New Delhi, India.

[16] IS: 1893 (Part I) – 2002 Criteria for Earthquake Resistant Design of Structures, Bureau of Indian Standards, New Delhi, India.

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