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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.
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.
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).
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/m² is recommended for residential buildings and more for commercial buildings.
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).
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.
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).
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.
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/cm² 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.
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Last Revised: October 14, 2006 04:56 PM.
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