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Free Applet - Requires JAVA Support from your Browser.Educational &
Reference Center


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Type 1. One Way Slab

A  script by A M Basheer

    This is a program made with JAVA SCRIPT for designing Reinforced Cement Concrete Slabs. If you are familiar with the required Design Data, enter them in the appropriate text boxes below and click "Design Slab" button to get results. If you are not familiar with the terms please click on the "?" marks to get definitions, and to learn a little about them before you try designing.

Design Of Simply Supported One Way Slab.

Effective Span ?
in (meters)

Live Load ?
in (Kg/mē) 

Trial thickness ?
in (Cm.)

Main bar Diameter ?
in (mm) 
Distribution bar Diameter  ?
in (mm)

Results:

 Pour Thickness:
 Main Bar Spacing:
Distribution Bar Spacing:

Type 2. Two way Slab

Design Of Simply Supported Two Way Slab.

Short Span ?
in (meters)

Long Span ?
in (meters)

Live Load ?
in (Kg/mē)

Trial thickness ?
in (Cm.)

Main bar Diameter ?
in (mm)

Results:

           Pour Thickness:
         Main Bar Spacing:
Distribution Bar Spacing:

Help for Part 1.

One way slab: 
   
One way slabs are designed to transfer their loads to only two opposite support walls. Generally for spans up to 3.60 meters and with length/breadth ratio is greater than 0.60 one way slabs can be provided.

Back to One Way Designer

Effective Span:
   
This is the distance between center of two opposite supports. In the case of one way slab the pair of opposite supports with shortest distance between them are taken as the supports. (Span is specified in meters).

Back to One Way Designer

Live Load:
   
This is the load expected to come on the slab after construction excluding the self weight of the slab. This will include load of flooring material provided and any other load that will come on the slab when using it. Generally a live load of 200 to 250 Kg/mē is recommended for residential buildings and more for commercial buildings.

Back to One Way Designer

Trial Thickness:  
   
To Design the slab, first we should assume a trial thickness. Then the safety of the provided thickness for the given load condition is checked. If safe, we adopt or if not ,we increase it and tried again. By this way we can get the minimum safe thickness required for our needs. To start with it is better to use a thickness 1/30 of the effective span. (Thickness is specified in centimeters).

Back to One Way Designer | Back to Two Way Designer

Main bar Diameter
   
This is the diameter of the steel bars we intend to use as the main bars for reinforcement. Main bars are the steel bars we provide from support to support, (between load bearing walls). Usually steel bars of 8mm to 14mm are used for main bars. Any way it is better to restrict the size of the main bar within 1/8 of the thickness. (Diameter is specified in millimeters).

Back to One Way Designer | Back to Two Way Designer

Distribution Bar Diameter:
   
This is the diameter of the bars we use as distribution bars. Distribution bars are the steel we provide in slabs in addition to main bars to distribute load and temperature evenly. These bars are provided at right angle to main bars. Usually bars of 6mm to 8mm diameter are used for this purpose. (Diameter is specified in millimeters).

Back to One Way Designer


Help for Part 2.

Two way slab:
    Two way slabs are designed to transfer their loads to all the four support walls. Generally for spans greater than 3.60 meters and with length/breadth ratio is less than 0.60 two way slabs can be provided. In this case main bars (referred under Part 1) are provided in both directions, mutually at right angles.

Back to Two Way Designer

Short Span:  
   
This is the distance between center of two opposite supports. In the case of Two way slab the distance between the pair of opposite supports with shorter distance between them are taken as the Short span. (Span is specified in meters).

Back to Two Way Designer

Long Span:
   
This is the distance between center of two opposite supports. In the case of Two way slab the distance between the pair of opposite supports with larger distance between them are taken as the long span. (Span is specified in meters).

    Definition of all other terms are same as that given for part 1 above. Please note that in two way slab, separate distribution bars are not provided.

Back to Two Way Designer

Technical aspects:
   
The design tried here, is based on the "Basic Elastic Theory". Two way slab design is based on the Rankine-Grashoff Theory. Reinforced cement concrete using 20 mm nominal size granite broken stones -M150 (1:2:4) is assumed for design. MS bars with a tensile strength of 4200 Kg/cmē is proposed for reinforcement. The factor of safety assumed is 3.

    In both types bend up the main bars at distance of 1/7th of span from supports to take negative bending.

Back to Two Way Designer


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Last Revised: October 14, 2006 04:56 PM.

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