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Unformatted text preview: CIVL 232 Design of Structural Concrete
Assignment 4 (Thursday, 25 2004)
Sections subjected to axial load and uniaxial bending; shear of RC beam sections
4.1 Construct an approximate M-N interaction diagram for the column section with h =
400 mm, d = 350 mm, d ′ = 50 mm, b = 300 mm, Asc / 2 = As = As′ = 981 mm2 (2T25).
Hint: At least four points (see Fig. 4.1 points a, b, c and d), which represent different
modes of failure, should be found.
M Fig. 4.1
4.2 A rectangular column section of breadth 350 mm, depth 600 mm (considering d =
0.9h), with symmetrical arrangement of reinforcement, is constructed. fcu = 40
N/mm2 and fy = 460 N/mm2.
(a) When N = 3000 kN and M = 800 kNm, calculate Asc using BS 8110 design charts.
(b) Determine if the section has sufficient capacity to resist a design axial load of
1800 kN at an eccentricity of 500 mm.
4.3 Design the shear reinforcement for the beam with dimensions, loads and moment
steel shown in Fig. 4.3. Gk = 40 kN/m (including self-weight), Qk = 12 kN/m, fcu = 30
N/mm2, fyv = 250 N/mm2. Fig. 4.3
4.4 Design the shear reinforcement for the beam shown in Fig. 4.4 using mild steel links
(fyv = 250 N/mm2) for the following load cases: (a) Qk = 0 kN/m, (b) Qk = 27 kN/m,
(c) Qk = 54 kN/m. fcu = 25 N/mm2. Fig. 4.4 4.5 A reinforced beam which is 300 mm wide and 600 mm deep is required to span 6 mm
between the centres of supporting piers 300 mm wide, as shown in Fig. 4.5. The
beam carries dead and imposed loads of 25 kN/m and 19 kN/m, respectively. fcu = 30
N/mm2, fy = 460 N/mm2, fyv = 250 N/mm2 and the exposure condition is mild. Design
the flexural and shear reinforcement. Fig. 4.5 4.6 A beam spans 6 m and carries two design concentrated loads of 400 kN as shown in
Fig. 4.6. Longitudinal bars (As) are 4T32 + 2T25 and stirrups (Asv) are R10 at 120
spacing for the shear spans. fcu = 35 N/mm2 for concrete. Design bent-up bars (Asb)
for the beam.
400 kN 2000 400 kN 2000 2000 6000
R10@120 R10 4T32 + 2T25 Fig. 4.6 ...
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This note was uploaded on 12/24/2011 for the course CIVL 232 taught by Professor Jskuang during the Spring '06 term at HKUST.
- Spring '06