Simply reinforced profile construction
Beam construction can be carried out according to different standards depending on specific requirements. Before designing a beam, we must first determine the bending moments and shear forces of the beam section through analysis.
BS 8110 Part 01 is one of the most widely used standards and the method described in the code is very easy to understand when compared to the guidance for the construction of other elements.
Project example
Design data
Bending moment = 250 kNm
Shear force = 200 kN
Beam width = 225 mm
Beam height = 600 mm
Concrete quality = 25 N/mm2
Steel strength = 460 N/mm2
Coverage up to R/F = 30 mm
Diameter of thrust links = 10 mm
A redistribution of momentum is not assumed.
Calculations
effective depth = 600-30-10-20/2
= 550mm
K = M/bd 2 fcu
= 250 × 10 6 /(225 × 550 2 x25)
= 0.147
K
The section is therefore simply reinforced.
Z = d(0.5+{0.25-K/0.9} 1/2 )
= 550(0.5+{0.25-0.147/0.9} 1/2 )
= 436.995mm
Than = M / (0.95fyZ)
= 250 × 10 6 / (0.95 x 460 x 436.995)
= 1309 mm 2
Provide three 25mm posts.
A properly constructed beam can fail for a variety of reasons. Article 6 Causes of Beam Failure For more information, read on.
