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

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Effect of varying the concrete design standards
on the buildings Safety and construction cost in
the UAE
CIVL 590
UAE University Faculty of Engineering Civil
Environmental Dept. Graduation Project II
Advisor- Dr. Tamer El-Maaddawy
Done By
Ahmed Sulaiman Al-Shehhi 200311935
Ahmed Ali Al-Dhaheri 200304150
Abdelnasir Ahmed Al-Naqbi 200337525
Yousef Saeed Embasi 200213420
Mana Abdullah Zaabi 200101289
Fall 2008
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Outline

• Introduction
• Objectives
• Background Theory
• Slab Design
• Columns Design
• Area of steel
• Comparisons
• Conclusion

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Introduction
RC is the most common material currently used in
the construction buildings and infrastructures in
the UAE
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Introduction
Because the UAE is a young country, every
consultant uses different standard codes in
designing different projects
BS-8110
ACI 318-08
CSA-A23.3
BS British Standard
ACI American Concrete
Institute
CSA Canadian Standard
Association
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Objectives
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
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Introduction
BS-8110
ACI 318-08
CSA-A23.3
Columns design
Slab design
Area of steel
Conservative
Economical
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Introduction
Building description
Ground
2P (Parking)
15 floors
The existing building
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Introduction
Used of building
Commercial
Residential
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Introduction
Slab 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
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Flat slab
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.
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Flat slab
Flat slabs may have drop panels at columns
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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

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Flat slab
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About Safe 8
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.
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Load Combination review
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Material Factors review

• CSA-A23.3 is more conservative in both
  Materials
• factors compared with BS-8110.
• ACI-318-08 does not have material factors

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Strength Reduction Factors Ø review
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Slab Design
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Slab Design

• AutoCAD Drawing

The slab of the building
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Load Calculations

• Dead load

Calculated directly by Safe 8 software, where
is thickness of slab and is specific
density of concrete.
F.C Flooring cover.
Own weight of wall
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Load Calculations
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Load Calculations
To determine the load per meter square we divide
the own weight of wall on the area of typical
floor
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

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Load Calculations

• Live load

We consider live load 3
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
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Slab analysis using safe 8
Enter calculated load (Dead Load)
Strips force in X-X direction
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Slab analysis using safe 8
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 Design

• Get the area of steel of slab in each 1 m

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Minimum concrete cover in slab
BS-8110
BS-8110
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Minimum concrete cover in slab
ACI-318
CSA
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Slab Design
Point 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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Column Design
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Columns Design
Layout of Columns
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Load Calculations
1) Tributary area
2) Ultimate Load (Pu)
The dead load include the load that coming from
slab
3) Are of steel (As)
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Load Calculations
Dead Loads on Columns
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Load Calculations
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Load Calculations
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Load Calculations
Live Loads on Columns
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Load Calculations
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Load Calculations
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Load Calculations
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Load Calculations
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Dead Live Load Results
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Analysis
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Analysis
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Area of steel in slab
Area of steel for strips in X direction
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Area of steel in slab
Area of steel for strips in Y direction
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Spreadsheets for flexure design
BS-8110
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Spreadsheets for flexure design
ACI-318-08
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Spreadsheets for flexure design
CSA-A23.3
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Effect of varying design standard on amount of
steel in slab
(Area of steel in X-direction strip 1-1)
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Effect of varying design standard on amount of
steel in slab
(Area of steel in X-direction strip 2-2)
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Effect of varying design standard on amount of
steel in slab
(Area of steel in Y-direction strip 1-1)
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Effect of varying design standard on amount of
steel in slab
(Area of steel in Y-direction strip 2-2)
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Spreadsheets for axial load design
BS-8110
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Spreadsheets for axial load design
ACI-318-08
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Spreadsheets for axial load design
CSA-A23.3
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Area of steel in Columns 5 7
The table represents the ultimate load on columns
and area of steel and percentage of steel in
columns
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Effect of varying design standard on amount of
steel in columns
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Conclusion
For flexural elements

• 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

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Conclusion
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.

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Summary
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Thanks For Listening
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