reinforced concrete design _ engineer's outlook

Posted on May 21, 2013

What makes Unique of RC…?

It is a COMPOSITE MATERIAL…

It requires APPLICATION of more involved Principles of Mechanics…

Structural Design is iterative requiring both ANALYSIS and DESIGN DECISIONS aided

by judgment and EXPERIENCE.

ACI 318 -the model code in the United States of America for guiding the design of RC

members, look at Chapter 8.

NSCP Code -the code in the Philippines..conforms to the provisions of ACI 318 Code!!!

Important Material Properties…

Concrete Strength and Steel Strength…

28-day Compressive Strength, f’c: ACI 318 Code 2011 edition, Chapter 5.

Modulus of Elasticity of Concrete, Ec: ACI 318 Code 2011 edition, Chapter 8.5

Strength property or yield strength, fy..

Modulus of Elasticity of Steel, Es: 29,000,000 psi –ACI 318 Code 2011 edition.

1. –Procedures on how to Design Reinforced Concrete Beams!!!

Concrete Beam Sizing..!

An Engineer's Simple Outlook and Journal blog..

Reinforced Concrete Design | Engineer's Outlook https://engineersoutlook.wordpress.com/2013/05/21/reinforced-concret...

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Determination of Beam Size (b x h)—USE Spreadsheet or Hand Calculation!!!

Concrete Beam Size (b x h) or (b x d), FORMULA:

Beam Section Diagram—

Beam Size Formula—

Beam Section, Strain and Force Diagram—


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Rebars Determination..

Area of Steel (As) determination!!!

The ACI Code 10.3.3 to 10.3.5 limits on the Steel Ratio (rho):

Equilibrium Equation orm Neutral Axis Distance, c — Quadratic Equation for c—

Strength Formula—

As—

Rho—


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1.1 Minimum Beam Size for which Deflections are NOT LIKELY to be a Problem.

1.1.1 Set Neutral Axis distance, c = 0.375cb….

1.2 Arrangement of Rebars, Splicing points and splice length, development length, hooks

requirement, and required Stirrups.

Smallest Beam Size NOT LIKELY TO HAVE DEFLECTION PROBLEM—

Stirrup Spacing Requirements per ACI—


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Stirrup Maximum Spacing—

ACI Bottom Bar Splice Requirements—


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2. –Procedures on how to Design Reinforced Concrete Columns!!!

ACI Standards for Top and Bottom Splice Requirements—

ACI Standards for Beams Reinforcements—


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Tie Design Standards—


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ACI Standards Columns Bars Details—

ACI Column Splice Details—


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ACI Bar Bending Details—


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2.A. –Structural Design for column using Interaction Diagram!!!

2.B. –Example of ACI Interaction Diagram.

ACI Bar Bending Details—

ACI Column Ties Requirements—

Interaction Diagram plot using Column design software and MS Excel Spreadsheet—


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Interaction Diagram-Rectangular Section-Courtesy of ACI—


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2.C. –Summary of Column Design Requirements!!!

Interaction Diagram-Spiral Column-Courtesy of ACI—


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2.1 Strength Reduction Factor, phi =0.70 -applicable up through ACI 318-1999; they have

been changed to phi =0.65, for compression controlled members (columns and beams under

compression controls) beginning with ACI 318-2002 Code, and continuing with the ACI 318-05

and 2008 up to present.

3.–Example: Design of Concrete Members, i.e. Frame Analysis, Beams, Columns, Footings

using MS Spreadsheet.

Column Design Requirements—

FRAME ANALYSIS-My own Spreadsheet Program—


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MS Excel Spreadsheet for Column—


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Column Excel Spreadsheet—

RC BEAMS—

RC FOOTING1—


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REFERENCES:

Design of Reinforced Concrete by Jack. C. McCormc, 3rd edition-1993, 7th

edition-2005, 9th edition-2011;

1.

Design of Concrete Structures by Arthur H. Nilson, 12th edition -1997, International

edition;

2.

Design of Concrete Structures by Arthur H. Nilson, 14th edition -2010, International

edition;

3.

Reinforced Concrete (A Fundamental Approach), by Edward G. Nawy, 6th edition

-2008,

4.

Reinforced Concrete, Mechanics and Design, by James K. Wight and James G.

MacGregor, 6th edition -2012,

5.

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RC FOOTING2—

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2 THOUGHTS ON “REINFORCED CONCRETE DESIGN”

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reinforced concrete design _ engineer's outlook

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