ce5510-advance structural concrete design-slender column
DESCRIPTION
CE5510-Advance Structural concrete design-Slender columnTRANSCRIPT
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CE 5510 - 2004
CE 5510
Advanced Structural Concrete Design
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CE 5510 - 2004
Slender Column Design
Braced Slender ColumnDesign MomentsUnbraced Slender ColumnsAdjustments to Additional Moments
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Class Objectives
Explain the effect of second order moments on axial force-moment interaction diagram
Identify a column as slender (or not) Slender means that slenderness effects are to be considered as per code of practice.
Determine the design moments for a slender column.
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Recommended Reading James G. MacGregor, REINFORCED CONCRETE:
Mechanics and Design, 3rd Ed., Prentice-Hall, 1997, Ch. 12.
Allen, A. H., REINFORCED CONCRETE DESIGN TO BS8110 SIMPLY EXPLAINED, E&FN Spon,
London 1988, Ch. 11 David A. Fanella, Time-saving design aids for
reinforced concrete, Part 3: Column and walls, STRUCTURAL ENGINEER, November 2001, pp 42-47.
The next few slides are from the Reinforced Concrete Council
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Introduction
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N M Relationship (BS 8110)
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N M Relationship (BS 8110)
Do you know why you can design for flexure only ifthe axial force is less than 0.1 fcuAc ?
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Design Charts for symmetrically reinforced rectangular cross-sections
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What is Buckling?
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What is buckling?
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What is Buckling?
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Slenderness Effects in Structures
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Classification of Structures
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Effective Length
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Effective Length
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Effective Length
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Effective Length (BS 8110)
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Effective Length
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Slenderness Ratio
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Slenderness Ratio
Bending and Axial Load
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Design Methods
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Design Methods
course
This is covered in detail later.
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Simplified Design Method
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Simplified Design Method
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Simplified Design Method
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Braced
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Simplified Design Method
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Simplified Design Method
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Simplified Design Method
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Bending about Both Axes
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Bending about Both Axes
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Bending about Both Axes
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Example: Calculate the area of steel required in the braced column
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ExampleA. H. Allen, pp 113-115
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Example: Slender Braced Column (Allen)
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BS 8110 : 1985
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Slender Beams
Slender Column DesignClass ObjectivesRecommended ReadingIntroductionN M Relationship (BS 8110)N M Relationship (BS 8110)Design Charts for symmetrically reinforced rectangular cross-sectionsWhat is Buckling?What is buckling?What is Buckling?Slenderness Effects in StructuresClassification of StructuresEffective LengthEffective LengthEffective LengthEffective Length (BS 8110)Effective LengthSlenderness RatioSlenderness RatioDesign MethodsDesign MethodsSimplified Design MethodSimplified Design MethodSimplified Design MethodBracedSimplified Design MethodSimplified Design MethodSimplified Design MethodBending about Both AxesBending about Both AxesBending about Both AxesExample: Calculate the area of steel required in the braced columnExampleA. H. Allen, pp 113-115Example: Slender Braced Column (Allen)BS 8110 : 1985Slender Beams