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RCC 12

The document outlines the design parameters and calculations for a main beam on the 1st floor at an internal support. It includes details such as dimensions, material strengths, and reinforcement requirements, concluding that the design is acceptable based on the calculated values. The beam's actual length-to-depth ratio meets the permissible limits, confirming its structural adequacy.

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manhbook23
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46 views2 pages

RCC 12

The document outlines the design parameters and calculations for a main beam on the 1st floor at an internal support. It includes details such as dimensions, material strengths, and reinforcement requirements, concluding that the design is acceptable based on the calculated values. The beam's actual length-to-depth ratio meets the permissible limits, confirming its structural adequacy.

Uploaded by

manhbook23
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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INPUT Location D&D: Main beam 1st Floor @internal support

Design mo 62 kNm fcu 30 N/mm² gc =


ßb 1 fy 460 N/mm² gs =
Span 3000 mm Comp cove 40 mm to main reinforcement
Height, h 400 mm Tens cover 48 mm to main reinforcement
Breadth, b 300 mm Side cover 35 mm to main reinforcement
Tens Ø 16 mm
Comp Ø 16 mm Section locCONTINUOUS SPAN
OUTPUT D&D: Main beam 1st Floor @internal support
d = 400 - 48 - 16/2 = 344.0 mm
(3.4.4.4) K' = 0.156 > K = 0.058 ok .
(3.4.4.4) z = 344.0(0.5 + (0.25 - 0.058/0.9)^½ ) = 320.1 < 326.8 mm
(Fig 3.3) fst = 438.1 N/mm²
As = 1E6 x 62 /320.1 /438.1 = 442 mm² .
PROVIDE 3 T16 tension steel = 603 mm²
(Equn 8) fs = 2/3 x 460 x 442 /603 = 224.8 N/mm²
(Table 3.11Comp mod factor = 1 + 0.390 /(3 + 0.390) = 1.115 < 1.5
(Table 3.10Tens mod factor = 0.55 + (477 - 224.8) /120 /(0.9 + 1.746) = 1.344 < 2
(3.4.6.3) Permissible L/d = 26.0 x 1.115 x 1.344 = 38.966 .
(3.4.6.1) Actual L/d = 3000 /344.0 = 8.721 ok .
. .
1.5
1.05
ain reinforcement
ain reinforcement
ain reinforcement

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