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Unformatted text preview: CIVL 232 Design of Structural Concrete
Assignment 7: Short columns with uniaxial and biaxial bending
Assigned: Thursday 11 May 2006
Due date: Thursday 18 May 2006 1. A 350-mm square, short braced column short supports the axial loads of Gk = 1,000
kN and Qk = 1,000 kN. Design the longitudinal steel and links for a 350 mm square.
Given that fcu = 40 N/mm2, fy = 460 N/mm2, fyv = 250 N/mm2.
(Hint: Read the Notes’ examples 7.4-1 and 7.4-2; use Eq. 7.3 or 7.4)
2. An internal column shown in Fig. 7.2 in a braced two-storey building supports
approximately symmetrical arrangements of beams, resulting in characteristic dead
and imposed loads each of 1000 kN being applied to the column. The column is 350
mm square and the storey height is 5 m. Design the longitudinal reinforcement and
links. Given that fcu = 40 N/mm2, fy = fyv = 460 N/mm2.
(Hint: Read Notes 7.4.2 of page 256; apply Eq. 7.5) 600 500 Column
350mm square Fig. 7.2
3. Design the longitudinal reinforcement and links for a 300 mm square, short braced
column which supports:
(a) an ultimate axial load of 1500 kN and bending moment of 70 kNm about x-x axis;
(b) an ultimate axial load of 1500 kN and bending moments of 50 kNm about x-x axis
and 35 kNm about y-y axis.
Given that fcu = 30 N/mm2, fy = 460 N/mm2, fyv = 250 N/mm2.
For (a), read Text Example 9.3 and Notes’ Example 7.4-3 of page 257.
For (b), read Notes Subsection 7.5.2 and the example of page 261, which will be
introduced next Tuesday 16 May 2006.) ...
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- Spring '06