A simply-supported rectangular beam with an 8 m span has a self-weight of 5.5 kN/m and an imposed load of 12 kN/m. In addition to this, the beam supports a brickwall with a thickness of 115 mm and a height of 3.2 m. Given: density of brick wall, ρbrickwall = 19 kN/m3 ; ? = 0.8; breadth of beam, b = 175 mm; concrete strength = 25 MPa; and fsy = 500 MPa. Assume the concrete cover is 30 mm and R10 shear links are used. a. Recommend a suitable depth for the beam and determine the area of reinforcement, Ast, according to minimum ductility requirements from AS3600 (ku = 0.36) by using N32 rebar. Detail the cross-section of the beam. b. Using the same beam dimensions from (a), design the steel requirement if N25 rebar is to be used instead. c. Based on your designs using N25 and N32 rebar, which rebar size would you recommend to the client? Justify your answer.
A simply-supported rectangular beam with an 8 m span has a self-weight of 5.5 kN/m and an imposed load of 12 kN/m. In addition to this, the beam supports a brickwall with a thickness of 115 mm and a height of 3.2 m. Given: density of brick wall, ρbrickwall = 19 kN/m3 ; ? = 0.8; breadth of beam, b = 175 mm; concrete strength = 25 MPa; and fsy = 500 MPa. Assume the concrete cover is 30 mm and R10 shear links are used. a. Recommend a suitable depth for the beam and determine the area of reinforcement, Ast, according to minimum ductility requirements from AS3600 (ku = 0.36) by using N32 rebar. Detail the cross-section of the beam. b. Using the same beam dimensions from (a), design the steel requirement if N25 rebar is to be used instead. c. Based on your designs using N25 and N32 rebar, which rebar size would you recommend to the client? Justify your answer.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A simply-supported rectangular beam with an 8 m span has a self-weight of 5.5 kN/m and an
imposed load of 12 kN/m. In addition to this, the beam supports a brickwall with a thickness
of 115 mm and a height of 3.2 m.
Given: density of brick wall, ρbrickwall = 19 kN/m3
; ? = 0.8; breadth of beam, b = 175 mm;
concrete strength = 25 MPa; and fsy = 500 MPa. Assume the concrete cover is 30 mm and
R10 shear links are used.
a. Recommend a suitable depth for the beam and determine the area of reinforcement, Ast,
according to minimum ductility requirements from AS3600 (ku = 0.36) by using N32
rebar. Detail the cross-section of the beam.
b. Using the same beam dimensions from (a), design the steel requirement if N25 rebar is
to be used instead.
c. Based on your designs using N25 and N32 rebar, which rebar size would you
recommend to the client? Justify your answer.
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Step 1: Introduce the problem statement
VIEWStep 2: Estimate the total dead load
VIEWStep 3: Determine maximum moment due to given loading
VIEWStep 4: Determine stress block parameters
VIEWStep 5: Determine percentage of steel corresponding to minimum ductility
VIEWStep 6: Determine depth of beam
VIEWStep 7: Compute area of reinforcement
VIEWStep 8: Recommend bar size for the given loading
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