Design of RCC T Beams as per IS 456-2000
(5/4)
Description
1. GENERAL :
The design of reinforcement for Limit State of Collapse in Flexure and Shear for T Beam Section is carried out as per IS-456. Check for Minimum and Maximum Reinforcement criteria is considered for Flexure as per the Code. Check for minimum shear reinforcement, maximum spacing of shear reinforcement is done as per the Code.
2. T Beam Design for Flexure as per IS 456 :
* The Input data for the Beam design for Flexure :
Factored BM (Mu), Beam Dimensions and Effective Cover for Tension and Compression Steel, Grade of Concrete fck
* Clear cover for the beam would be as per Table16 for Durability criteria and as per Table 16A for Fire resistance criteria. In mild exposure condition for a fire resistance of 0.5 hour, 20mm cover is provided for stirrups. Based on this eff. cover would be calculated by designer based on no. of layers in which steel would be provided. To start with 40 to 50mm cover may adopted and corrected on finding the actual disposition of bars in next iteration by the designer.
* For given BM, Mu < Mu,lim, the section is singly reinforced beam and only Tension steel is calculated, comp. steel would be zero. Minimum area of tension steel Ast,min (mm2) = 0.205 % of the gross area of section. If Ast, calculated < Ast,min, Ast,min is reported. For Mu > Mu,lim both tension and comp. steel are calculated. The Maximimum Tension Steel is 4 % of the gross area of section. If Ast,calculated > Ast,max, A message to "REV DEPTH" appers in the cell.
* Based on the area of steel required 'Ast', use Rebar calculator to to determine size and number of bars required. Recalculate the effective cover based on the rebar arrangement, with input of revised cover recalculate design steel required. The spacing < 180mm as per Cl.26.3.3. for zero % redistribution of moment with Fe 415 steel.
3. DESIGN PROCESS :
Give Input Data in white space, with red font. See the Instructions on the BM-DSN worksheet.
4. DISCLAIMER
* TO BE USED BY QUALIFIED STRUCTURAL ENGINEER FOR DESIGN AS PER OF IS - 456. CHECK BEFORE USE.
* NO LIABILITY OF DEVELOPER OF ANY TYPE UNTILL A LICENCE AGREEMENT IS SIGNED BETWEEN USER AND DEVELOPER, AND THAT THE USER IS FORMALLY TRAINED FOR USE OF THIS SPREAD SHEET, INCL. ITS ADVANTAGES AND ITS LIMITATIONS.
Calculation Reference
Reinforce Concrete Design
Indian Standard 456
RCC Design
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(5/4)
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