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RCC T BEAM

The document provides structural calculations for a main beam with an 8m span on the first floor, detailing parameters such as moment, span, and reinforcement specifications. It includes calculations for effective depth, lever arm, and required steel area, confirming that the design meets permissible limits for deflection. The analysis concludes that the actual L/d ratio is acceptable, ensuring structural integrity.

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manhbook23
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29 views2 pages

RCC T BEAM

The document provides structural calculations for a main beam with an 8m span on the first floor, detailing parameters such as moment, span, and reinforcement specifications. It includes calculations for effective depth, lever arm, and required steel area, confirming that the design meets permissible limits for deflection. The analysis concludes that the actual L/d ratio is acceptable, ensuring structural integrity.

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 8m span

M 328 kNm fcu 40 N/mm² gc =


ßb 1 fy 460 N/mm² gs =
span 8000 mm Comp cove 48 mm to main reinforcement
h 500 mm Tens cover 40 mm to main reinforcement
bw 300 mm Side cover 35 mm to main reinforcement
bf 1420 mm
hf 175 mm Section locINTERIOR SPAN
Tens Ø 25 mm Section ty T BEAM
Top steel 2 no & Ø 12
OUTPUT D&D: Main beam, 1st Floor 8m span
d = 500 - 40 - 25/2 = 447.5 mm
K' = 0.156 > K = 0.029
(3.4.4.4) z = 447.5(0.5 + (0.25 - 0.029 /0.9)^½) = 432.7 > 425.1 mm
(3.4.4.4) x = (447.5 - 425.1) /0.45 = 49.7 mm .
(3.4.4.4) As = 328.00E6 /425.1 /460 x 1.05 = 1761 mm² .
PROVIDE 4 T25 bottom = 1963 mm² .
(Eqn 8) fs = 2/3 x 460 x 1,761 /1,963 = 275.1 N/mm²
(Table 3.11Comp mod factor = 1 + 0.168 /(3 + 0.168) = 1.053 < 1.5
(Table 3.10Tens mod factor = 0.55 + (477 - 275.1) /120 /(0.9 + 1.153) = 1.370 < 2
(3.4.6.3) Permissible L/d = 20.8 x 1.053 x 1.370 = 30.001
(3.4.6.1) Actual L/d = 8000 /447.5 = 17.877 ok ok
1.5
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