gpii final presentation

Effect of varying the concrete design standards on the buildings Safety and construction cost in the UAE

Advisor:- Dr. Tamer El-Maaddawy

Done ByAhmed Sulaiman Al-Shehhi 200311935

Ahmed Ali Al-Dhaheri 200304150

Abdelnasir Ahmed Al-Naqbi 200337525

Yousef Saeed Embasi 200213420

Mana Abdullah Zaabi 200101289

UAE University

Faculty of Engineering

Civil & Environmental Dept.

Graduation Project II

Fall 2008

CIVL 590

OutlineOutline

Introduction

Objectives

Background Theory

Slab Design

Columns Design

Area of steel

Comparisons

Conclusion

CIVL 590

GP II

IntroductionIntroduction

RC is the most common material currently used in the

construction buildings and infrastructures in the UAE

CIVL 590

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IntroductionIntroductionBecause the UAE is a young country, every consultant uses different standard codes in designing different projects

CIVL 590

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BS-8110 ACI 318-08 CSA-A23.3

BS British Standard

ACI American Concrete Institute

CSA Canadian Standard Association

ObjectivesObjectives CIVL 590

GP II

Perform a comparative analysis between the international code requirements used in design and analysis of concrete buildings in the UAE

Design selected elements of an existing building

IntroductionIntroduction CIVL 590

GP II

BS-8110 ACI 318-08 CSA-A23.3

Columns designSlab design

Area of steel

Conservative Economical

The existing building The existing building

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Building description

Ground

2P (Parking)

+15“ floors ”

IntroductionIntroduction

IntroductionIntroduction CIVL 590

GP II

Used of building

CommercialResidential

IntroductionIntroductionSlab design

Design Flat Slab

Hand Calculations (Dead & Live) Load

Using Safe 8 Software To Analyze The Slab

Area Of Steel

Columns design

Determine Tributary Area

Hand Calculations (Dead & Live) Load

Calculate Ultimate Load On Columns

Area Of Steel

Flat slabFlat slab CIVL 590

GP II

A concrete slab which is reinforced in two or more directions, usually without beams or girders to transfer the loads to supporting members

Flat slabs design is appropriate for most floor situations and is also

suitable for irregular column layouts, curved floor shapes, ramps etc.

Flat slabFlat slabFlat slabFlat slab

Flat slabs may have drop panels at columns

CIVL 590

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Why Flat is commonly used?Why Flat is commonly used?

Minimum depth

Speed up the construction

Flexibility in the plan layout (both in terms of the shape and column

Layout)

Clean finishes and freedom of layout of services

The flexibility of flat slab construction can lead to high economy and

yet allow the architect great freedom of form

Minimum depth

Speed up the construction

Flexibility in the plan layout (both in terms of the shape and column

Layout)

Clean finishes and freedom of layout of services

The flexibility of flat slab construction can lead to high economy and

yet allow the architect great freedom of form

CIVL 590

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Flat slabFlat slabCIVL 590

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CIVL 590

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Safe 8 is a special purpose program that automates the analysis and design of simple to complex concrete flat plates and foundation systems

using powerful object based modeling.

The program can analyze and design slabs or mats of arbitrary shapes and varying thickness, drop panels

The software produces reinforcing layouts and evaluates the effects of punching shear around column supports.

About Safe 8About Safe 8

Load Combination Load Combination [review][review] CIVL 590

GP II

CSA-A23.3 is more conservative in both Materials factors compared with BS-8110.

ACI-318-08 does not have material factors

CSA-A23.3 is more conservative in both Materials factors compared with BS-8110.

ACI-318-08 does not have material factors

Material Factors Material Factors [review][review] CIVL 590

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Strength Reduction Factors Strength Reduction Factors ØØ [review][review]Strength Reduction Factors Strength Reduction Factors ØØ [review][review]

CIVL 590

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CIVL 590

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Slab DesignSlab Design

The slab of the building The slab of the building

AutoCAD Drawing AutoCAD Drawing

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Load CalculationsLoad Calculations Dead load

Dead load

wocs wallsservisesCFtDL ..

cst

wowall .

Calculated directly by Safe 8 software, where is thickness of slab and is specific density of concrete.

Calculated directly by Safe 8 software, where is thickness of slab and is specific density of concrete. c

st

F.C = Flooring cover.F.C = Flooring cover.

= Own weight of wall= Own weight of wall

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Load CalculationsLoad Calculations

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To determine the load per meter square we divide the own weight of wall on the area of typical floor =

To determine the load per meter square we divide the own weight of wall on the area of typical floor =

floor typicalof Area

wallof Own weight

Own weight of wall = 0.2 m x 642.025 m x 0.31 m x 0.2 m = 844.28 KN

To determine the load per meter square we divide the own weight of wall on the area of typical floor; where are of typical floor = 1375.2859

Dead load coming from walls =

Own weight of wall = 0.2 m x 642.025 m x 0.31 m x 0.2 m = 844.28 KN

To determine the load per meter square we divide the own weight of wall on the area of typical floor; where are of typical floor = 1375.2859

Dead load coming from walls = 2/41.6

2859.1375

28,844mkN

Load CalculationsLoad Calculations

2m

We consider live load = 3We consider live load = 3

Load CalculationsLoad Calculations CIVL 590

GP II

Live load Live load

The live load value is taken from the minimum design load of ASCE7-05 and it is suitable for the activity that will take place in the building “offices and residential

3/mkN

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Slab analysis using safe 8Slab analysis using safe 8

Enter calculated load (Dead & Load)

Strips force in X-X direction Strips force in X-X direction

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Slab analysis using safe 8Slab analysis using safe 8

Strips force in Y-Y direction Strips force in Y-Y direction

The ultimate moments for selected two strips in “x” and “y” directions will be tabulated

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Slab DesignSlab Design Get the area of steel of slab in each 1 m

Get the area of steel of slab in each 1 m

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Minimum concrete cover in slabMinimum concrete cover in slab

BS-8110BS-8110

BS-8110BS-8110

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Minimum concrete cover in slabMinimum concrete cover in slab

ACI-318ACI-318

CSACSA

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Slab DesignSlab DesignPoint 1& 2 are real moments that we are focus on where the maximum

point of moment will be resisted by the column depth.

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CIVL 590

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Columns DesignColumns Design

Layout of Columns Layout of Columns

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1) Tributary area 1) Tributary area

Load CalculationsLoad Calculations

2) Ultimate Load (Pu)2) Ultimate Load (Pu)

The dead load include the load that coming from slab

The dead load include the load that coming from slab

3) Are of steel (As)3) Are of steel (As)

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Load CalculationsLoad CalculationsDead Loads on ColumnsDead Loads on Columns

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Load CalculationsLoad Calculations

CIVL 590

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Load CalculationsLoad Calculations

CIVL 590

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Load CalculationsLoad Calculations

Live Loads on ColumnsLive Loads on Columns

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Load CalculationsLoad Calculations

CIVL 590

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Load CalculationsLoad Calculations

CIVL 590

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Load CalculationsLoad Calculations

CIVL 590

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Load CalculationsLoad Calculations

Dead & Live Load ResultsDead & Live Load ResultsCIVL 590

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CIVL 590

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AnalysisAnalysis

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AnalysisAnalysis

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Area of steel in slabArea of steel in slab

Area of steel for strips in X direction Area of steel for strips in X direction

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Area of steel in slabArea of steel in slab

Area of steel for strips in Y direction Area of steel for strips in Y direction

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Spreadsheets for flexure designSpreadsheets for flexure design Spreadsheets for flexure designSpreadsheets for flexure design

BS-8110 BS-8110

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Spreadsheets for flexure designSpreadsheets for flexure design Spreadsheets for flexure designSpreadsheets for flexure design

ACI-318-08ACI-318-08

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Spreadsheets for flexure designSpreadsheets for flexure design Spreadsheets for flexure designSpreadsheets for flexure design

CSA-A23.3CSA-A23.3

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Area of steel on slab in X direction (Strip 1-1)

0

100

200

300

400

500

600

700

800

900

1000

1 2 3 4 5 6 7 8 9 10

Moments points

Are

a o

f ste

el

BS-8110

ACI-318-08

CSA-A23.3

(Area of steel in X-direction: strip 1-1) (Area of steel in X-direction: strip 1-1)

Effect of varying design standard on Effect of varying design standard on

amount of steel in slabamount of steel in slab

CIVL 590

GP II

Area of steel on slab in X direction (strip 2-2)

0

200

400

600

800

1000

1200

1 2 3 4 5 6 7 8 9

Moments points

Are

a o

f ste

el

BS-8110

ACI-318-08

CSA-A23.2

(Area of steel in X-direction: strip 2-2) (Area of steel in X-direction: strip 2-2)

Effect of varying design standard on Effect of varying design standard on

amount of steel in slabamount of steel in slab

CIVL 590

GP II

Area of steel on slab in Y direction (strip 1-1)

0

100

200

300

400

500

600

700

800

1 2 3 4 5 6

Moments points

Are

a o

f ste

el

BS-8110

ACI-318-08

CSA-A23.3

(Area of steel in Y-direction: strip 1-1) (Area of steel in Y-direction: strip 1-1)

Effect of varying design standard on Effect of varying design standard on

amount of steel in slabamount of steel in slab

CIVL 590

GP II

Area of steel on slab in Y direction (strip 2-2)

0

50

100

150

200

250

300

350

400

450

1 2 3 4 5 6

Moments points

Are

a o

f ste

el

BS-8110

ACI-318-08

CSA-A23.3

(Area of steel in Y-direction: strip 2-2) (Area of steel in Y-direction: strip 2-2)

Effect of varying design standard on Effect of varying design standard on

amount of steel in slabamount of steel in slab

Spreadsheets for axial load designSpreadsheets for axial load design Spreadsheets for axial load designSpreadsheets for axial load design CIVL 590

GP II

BS-8110 BS-8110

Spreadsheets for axial load designSpreadsheets for axial load design Spreadsheets for axial load designSpreadsheets for axial load design CIVL 590

GP II

ACI-318-08ACI-318-08

Spreadsheets for axial load designSpreadsheets for axial load design Spreadsheets for axial load designSpreadsheets for axial load design CIVL 590

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CSA-A23.3CSA-A23.3

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Area of steel in Columns 5 & 7Area of steel in Columns 5 & 7

The table represents the ultimate load on columns and area of steel and percentage of steel in columns

The table represents the ultimate load on columns and area of steel and percentage of steel in columns

CIVL 590

GP II

Area of steel in columns 5 & 7

0

10000

20000

30000

40000

50000

60000

Column 5

Are

a o

f ste

el

BS-8110

ACI-318-08

CSA-A23.3

Column 7

Effect of varying design standard on Effect of varying design standard on

amount of steel in columnsamount of steel in columns

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ConclusionConclusion

The BS-8110 is the most conservative code

The ACI-318-08 is the most economical code

The use of CSA-A23.3 code would usually in a slight reduction in the amount

of steel compared with that obtained from the BS-8110 code

The BS-8110 is the most conservative code

The ACI-318-08 is the most economical code

The use of CSA-A23.3 code would usually in a slight reduction in the amount

of steel compared with that obtained from the BS-8110 code

For flexural elements

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For axially loaded members

The CSA-A23.3 code was found very economical relative to the BS-8110 and the ACI-318-08

The steel percentage ratios determined using the BS-8110 and the ACI-318-08

codes were almost the same and both were remarkably highest than that obtained using CSA-A23.3.

The CSA-A23.3 code was found very economical relative to the BS-8110 and the ACI-318-08

The steel percentage ratios determined using the BS-8110 and the ACI-318-08

codes were almost the same and both were remarkably highest than that obtained using CSA-A23.3.

ConclusionConclusion

SummarySummary