comparative study between regular concrete and …

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COMPARATIVE STUDY BETWEEN REGULAR CONCRETE AND LIGHT

WEIGHT CONCRETE TO BE USED IN CONCRETING OF SHEAR WALL

Prashant Pundkar*1, Amit Gawande*2 *1P.G. Student, Civil Engineering Department, College Of Engineering & Technology,

Akola, Maharashtra, India.

*2Assitant Professor, Civil Engineering Department, College Of Engineering & Technology,

Akola, Maharashtra, India.

ABSTRACT

In current study we are comparing regular concrete and light weight concrete from the perception of weight

loss (Dead Load Reduction) of different structural elements of buildings specially shear walls. The primary use

of light weight concrete from structural point of view is to reduce dead load of concrete structure which allows

us to reduce the size of structural members resulting in reduction of earthquake forces on it. In structural

engineering a shear wall is basically a vertical element used to resist seismic forces on structure. In this project

the attempt is made to predict response of multi storey building with the use of light weight and regular

concrete in special member viz. shear wall which helps in resisting seismic forces. To compare the seismic

behavior of shear wall made up with regular concrete and light weight concrete provided in G+9 residential

building located in zone v. Staad-pro package is being used to analyze the structure.

I. INTRODUCTION

Seismic analysis of structure for light weight concrete and regular concrete and finding out the best suitable

material for shear wall. Comparison of shear force, bending moments and shear stress for shear wall

constructed in Regular concrete and Light weight concrete.

1. Concrete – This is the regular concrete made using cement, sand, aggregate and water with a mix

proportion of M25 grade with no changes in its physical properties to which the regular concrete is been

used at various constructions.

2. Light Weight Concrete (LWC) – Also known as Foam Concrete it is a new material been introduced in

construction industry for casting at places where the concrete density is to be reduced or thermal resistivity

or sound absorption has to be achieved. The contents used for preparation this type of concrete are cement,

fly ash, foam and water. As the name suggests its density ranges from 400 – 1600 kg/m3 which in

comparison to regular concrete is much lesser.

Fig 1: Cross-sectional image of Foam Concrete Cube with its texture





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II. PLANNING & MODELLING

Description of building model

Present study involves to find the best suitable material for concreting of shear wall for a G+9 RCC tall building

in zone V. The project is been carried out using the software STAAD-pro. In total 2 models are created namely

M1, M2 are the models with same structure and design with only difference in material used for shear wall. In

model M1 regular concrete has been used for shear wall whereas in model M2 Light Weight concrete have been

used. Analysis of each of the models were done and the results were compared with each other and the

respective graphs where been obtained.

Details of Structural Elements and Materials

Plan dimension – 9m X 6m

Total height of building – 30 m

Height of each storey –3 m

Sizes of columns –300mm X 600mm

Size of beams –300mm X 450mm

Thickness of slab – 100 mm

Thickness of Wall –230 mm

Live load on floors –2 KN/m2

Seismic zone – V

Soil condition – Medium soil (Type II)

Response reduction factor – 5.0

Importance factor – 1.0

Grade of concrete – M25

Grade of steel – Fe 500

Bricks - Clay burnt brick, Class A, confined unreinforced masonry

Shear Wall Thickness – 100mm

Model M1 – Shear wall in Regular Concrete

Fig 2

Young’s Modulus (E) - 2.1718.5e+007 kN/m2

Poisson’s Ratio (nu) - 0.17

Density - 23.5616 kN/m3





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Thermal Coefficient - 1e-005 /0C

Critical Damping - 0.05

Shear Modulus (G) - 9.28139e+006 kN/m2

Compressive Strength (Fcu)- 25000 kN/m2

Model M2 – Shear wall in Light Weight Concrete

Fig 3

Young’s Modulus (E) - 1.6e+007 kN/m2

Poisson’s Ratio (nu) - 0.25

Density - 5.5 kN/m3

Thermal Coefficient - 1e-005 /0C

Critical Damping - 0.05

Shear Modulus (G) - 9.28139e+006 kN/m2

Compressive Strength (Fcu)- 22000 kN/m2

III. ANALYSIS RESULTS

A comparative study is done on the behavior of shear wall. The results are calculated in term of bending

moment, shear force and shear stress.

Fig 4: The image of final results interpreted on model M1





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Fig 5: The image of final results interpreted on model M2

Fig 6: Image showing Shear Stress acting upon model M 1

Fig 7: Image showing Shear Stress acting upon model M 2





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Fig 8: Bending Moment comparison of entire structure

Fig 9: Shear Force comparison of entire structure

Fig 10: Shear Stress Comparison of Shear Wall

0.27

0.28

0.29

0.3

0.31

0.32

0.33

0.34

0.35

kNm

Max Bending Moments

M1 M2

0.29

0.295

0.3

0.305

0.31

0.315

0.32

0.325

kNm

kNm

Max Shear Force

M1 M2

0

0.5

1

1.5

2

SHEA

R N

/mm

2

Max Absolute Shear Stress

M1 M2





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IV. CONCLUSION In the following research work after analyzing both the models in the STAAD-Pro software for the best suitable

material between regular concrete and light weight concrete to be used in construction of a shear wall, the

above graphs and results were obtained and by analyzing them and taking various factors into account it is

found that Model M1 in which shear wall is made of regular concrete exhibits good structural qualities in

respect to Bending Moment and Shear Force in comparison to model M2 who’s shear wall is made of Light

Weight Concrete. Moreover, in the shear stress comparison of both the shear walls from the values obtained it

can be interpreted that shear wall made of regular concrete can take up more stress’s than the shear wall made

of light weight concrete.

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comparative study between regular concrete and …

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