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In: Civil Engineering

A rectangular beam carrying a uniform load of 26 KN/m including its own weight is limited...

A rectangular beam carrying a uniform load of 26 KN/m including its own weight is limited in cross section to 300 mm x 500 mm. The beam is simply supported in a span of 6 m. Using fc = 7 Mpa, fs = 124 Mpa, n = 12, ?? = 40 ???, ?? = 1.7 ???, ?????? ?ℎ? ????. Allow 65 mm distance from centroid of steel bars to extreme fibers.

Solutions

Expert Solution


Moment M=

reinforcement ratio =

=1.2%

size of beam = bd

d = effective depth =D-d'-dia/2

take 20mm diameter bar

d required < d provided hence safe

122.38<500mm

d=500-65-20/2 =425mm

C=T

area of steel  As =

no of bar of 20mm diameter =

VVa =40Mpa

provide 2 legged striupp of 25m diameter

shear reinforcement

Smax =d/2=422/2 =211mm

or s =300mm

provided spacing of 300mm

Ally Wells answered 7 months ago
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