YS-STS-BS-02

STEEL BEAM DESIGN

Problem

Determine structural steel beam carrying 600kNm of bending moment about its major axis and 253kN of shear force. Use steel grade S355.

Solution

1. Select a structural steel section.
2. Determine the segment length of bending about both major and minor axes.
3. Calculate the effective length based on the beam restraint conditions.
4. Determine the section class by referring to cl.3.5.2, BS5950-1:2000.
5. Determine whether shear buckling check is required, as stated in cl.4.2.3, BS5950-1:2000.
6. Determine the shear area of section as per cl.4.2.3, BS5950-1:2000.
7. Calculate the shear resistance of section by referring to cl.4.2.3, BS5950-1:2000.
8. Determine the design bending strength of section based on its thickness.
9. Calculate the bending moment resistance of section by referring to cl.4.2.5, BS5950-1:2000.
10. Determine the slenderness ratio using beam effective length and section's radius of gyration about minor axis, based on cl.4.3.6.7, BS5950-1:2000.
11. Calculate slenderness factor by using the formulation provided in cl.4.3.6.7, BS5950-1:2000.
12. Determine equivalent slenderness as per cl.4.3.6.7, BS5950-1:2000.
13. Determine the bending strength of section by referring to Table 16, BS5950-1:2000.
14. Calculate the buckling moment resistance of beam based on cl.4.3.6.4, BS5950-1:2000.
15. Calculate the product of yield strength and section modulus about minor axis of beam section, as stated in cl.4.7.7, BS5950-1:2000.
16. Calculate the compression resistance of section based on cl.4.8.3.2, BS5950-1:2000
17. Calculate the slenderness ratio of compression member as per cl.4.7.2, BS5950-1:2000.
18. Determine strut curve based on the type of structural steel section, by referring to Table 23.
19. Determine the compressive strength of section based on Table 24.
20. Calculate the compression resistance (buckling) of the section by referring to cl.4.7.4, BS5950-1:2000.
21. Evaluate the beam design by using the shear capacity ratio and cross section capacity ratio (compression and bending) as given in cl.4.8.3.2, BS5950-1:2000.
22. Evaluate the beam design by using the buckling capacity ratio given in cl.4.8.3.3.1, BS5950-1:2000.