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CE 5510 5510 - 200 2004 4
CE 5510 Advanced Structural Concrete Design
CE 5510 5510 - 200 2004 4
Slender Column Design Braced Slender Column Design Moments Unbr Un brac aced ed Sl Slen ende derr Co Colu lumn mnss Adjustments to Additional Moments
CE 5510 5510 - 200 2004 4
Slender Column Design Braced Slender Column Design Moments Unbr Un brac aced ed Sl Slen ende derr Co Colu lumn mnss Adjustments to Additional Moments
CE 5510 5510 - 200 2004 4
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.
CE 5510 5510 - 200 2004 4
Recommended Reading • James G. MacGregor, “REINFORCED CONCRETE:
Mechanics and Design”, 3rd Ed., Prentice-Hall, 1997, Ch. 12. CONCRETE DESIGN • Allen, A. H., “REINFORCED CONCRETE 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
CE 5510 - 2004
Introduction
CE 5510 - 2004
CE 5510 - 2004
N – M Relationship (BS 8110)
CE 5510 - 2004
N – M Relationship (BS 8110) Do you know why you can design for flexure only if the axial force is less than 0.1 f cuAc ?
CE 5510 - 2004
Design Charts for symmetrically reinforced rectangular cross-sections
CE 5510 - 2004
What is Buckling?
CE 5510 - 2004
What is buckling?
CE 5510 - 2004
What is Buckling?
CE 5510 - 2004
Slenderness Effects in Structures
CE 5510 - 2004
Classification of Structures
CE 5510 - 2004
Effective Length
CE 5510 - 2004
Effective Length
CE 5510 - 2004
Effective Length
CE 5510 - 2004
Effective Length (BS 8110)
CE 5510 - 2004
Effective Length
CE 5510 - 2004
Slenderness Ratio
CE 5510 - 2004
Slenderness Ratio
Bending and Axial Load
CE 5510 - 2004
Design Methods
CE 5510 - 2004
Design Methods
course
This is covered in detail later.
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Braced
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Simplified Design Method
CE 5510 - 2004
Bending about Both Axes
CE 5510 - 2004
Bending about Both Axes
CE 5510 - 2004
Bending about Both Axes
CE 5510 - 2004
Example: Calculate the area of steel required in the braced column
