Home  Tell-A-Friend    Discussion Board  Contact Us

civil engineer

Treasure of Civil Engineering Resources

Course materials, Books, Computer software, Quiz,  Conferences, Journals, Research theses, Jobs, Products, Services etc.

 ACI guidelines for Reinforced Concrete

 

Some of the guidelines by ACI (American Concrete Institute) are given below to help in design of reinforced concrete beams.

Spacing of Reinforcement

1. Minimum clear spacing between parallel bars in a layer should be equal to diameter of the bar but not less than 1 inch.

2. Where parallel reinforcement is placed in two or more layers, bars in the upper layers shall be place directly above the bars in the bottom layers with clear spacing between the layers not leass than 1 in.

3. Maximum spacing of reinforcement bars closest to the tension face shall not exceed the following;

   s = 15 (40,000/fs ) - 2.5 cc 

or s = 12(40,000/fs ) 

where cc  is the least distance from surface of reinforcement to the tension face, and  fs is the calculated stress in reinforcement closest to the tension face.

The table given below is showing minimum beam width required for a reinforced concrete rectangular section as per ACI guidelines

beam width ad per ACI

#14 and #18 are rarely used for beams. This table is based on the assumption that maximum aggregate size does not exceed three-fourth of the clear space between bars, and the #3 bars are used as stirrup.

The diameter of different bar sizes are given in brackets; #3(0.375in), #4 (0.5 in.), #5 (0.625 in.), #6 (0.750), #7 (0.875), #8 (1.00 in.), #9 (1.128 in.), #10 (1.270 in.) #11 (1.410 in.), #14 (1.693 in.), #18 (2.257 in.)

Featured Links

Moment of Inertia calculatorNew

For different sections including I-section and T-section.

Deflection CalculatorNew

Easy to use calculator for different loads on beams

Problem SolverNew

A collection of illustrated solved examples for civil engineers.

RC Beam CalculatorNew

Calculate the strength of reinforced concrete beams

CE QUIZNew

A collection of quiz in different areas of civil engineering

Bending Moment calculatorNew

Calculate Bending moments for simply supported beams

Structural Analysis

Applied Mechanics

CE HorizonNew

Online Civil Engineering Journal and Magazine

Profile of Civil EngineersNew

Get to know about distinguished civil engineers

Minimum amount of reinforcement in a beam should be maximum of the following

         As,min  = 3(f 'c )0.5 bd / fy

or    As,min  = 200 bd / fy

the values of f 'c  and  fy are taken in psi (pound per square inch), and the concrete used should not have f 'c  less than 2500 psi.

Commonly used concrete has f 'c  ranging from 3000 psi to 6000 psi, and steel with fy of 40000 psi, 50000 psi or 60000 psi.

Minimum cover requirement:

In case of concrete not exposed to weather or in conctact with ground the cover for re-bar shall not be less than the following

  for #14 and # 18 bars-       1.5 in. cover

  for #11 and smaller bars-    0.75 in. cover

In case of concrete exposed to earth or weather;

  #6 through #18 bars-     2 in. cover

  #5 and smaller-     1.5 in. cover

In case of cast against and permanently exposed to earth, a cover of 3 in. should be provided.

To learn more about strength of reinforced concrete beam please visit solved example 9-1 , example 9-2, example 9-3

For strength of RC beam visit online RC Beam Calculator

 more solved Problem for civil engineers

Do you know what is shearing force and bending moment

Moment Distribution CalculatorNew

Easy to use calculator for solving  Indeterminate beams with different load

Overhanging Beam CalculatorNew

Bending Moment & Shear Force Calculation for Overhanging beam with different loads

Fixed Beam Calculator

Shear force and bending moment calculations for different loading cases of Fixed beam

 

 

 

If you don't find the required information please tell us We are updating the website regularly.

Join the mailing list to get informed about new products or links

 

Applied Mechanics 

Structural Analysis 

Design of Structures

Construction Materials

Engineering Graphics

Disaster Management

Geotechnics

Transportation

Land Surveying

Hydraulics

Environmental Engineering

Irrigation Engineering

Offshore Engineering

Construction Management 

Quantity Surveying

Construction Disputes

Construction Technology

Construction Equipments

Research Papers

Journals & Magazines

Construction Companies

Consultants

Professional Societies

Computer Software 

Conferences

Photo Album

Home

Tell-a-friend

Join us

Job Search

Book Store

Scholarships

Colleges & Universities

Learning Support

Last updated on Monday July 01, 2013