Last Updated on September 14, 2026 by Maged kamel
- List of Steel Beam Posts- Part 2
- Solved problems 4-5: How to design a steel Beam?
- Step-by-step review of the information on Lp, Lr, and Fcr.
- Solved problem 4.6: How to find the available flexural strength?
- Solved problem 9-7-where Lb is bigger than Lr.
- Step-by-step on how to use a design chart with a given Lbr?
- Solved problems 4- 7: design using Table 3-10 when Lb>Lr.
List of Steel Beam Posts- Part 2
Solved problems 4-5: How to design a steel Beam?
This is the first Post in Steel Beam Posts, Part 2, and it includes solved problems 4-5 from Prof. Alan Williams’s book. A supported Beam of grade 50 steel is laterally braced at 4 ft intervals.
If the Beam is subjected to a uniform factored bending Moment of 270 ft-kips based on LRFD or 180 ft-kips based on ASD, with Cb=1.0, determine (a) the lightest adequate W-shape, and (b) the W-shape with the minimum allowable depth.

A supported Beam of grade 50 steel is laterally braced at 4 ft intervals. The Beam is subjected to a uniform factored bending Moment of 270 ft-kips (LRFD) or 180 ft-kips (ASD), with Cb=1.0.
Determine (a) the lightest adequate W shape and (b) the W shape with the minimum allowable depth.
This is the Link to Post 11: Solved problem 4-5: How to design a steel Beam?
You can view or download the Post 11 PDF by clicking the button below.
Step-by-step review of the information on Lp, Lr, and Fcr.
This is the 2nd Post in the steel Beam posts-part-2 series and includes definitions of the following items: Lp, Lr, and Fc.
Practice problem: For a given steel W24x176 at Fy=36 ksi, find the bracing length at the plastic stage (Lp) and the limiting laterally unbraced length, along with the values of Mp and Mr.

This is the Link to Post 12: Step-by-step review of the information on Lp, Lr, and Fcr.
You can view or download the Post 12 PDF by clicking the button below.
Solved problem 4.6: How to find the available flexural strength?
This is the 3rd position of the steel beams (part) and includes a solved problem from Prof. Alan Williams’s reference handbook. This is an inelastic buckling case.
Solved problem 4.6: A supported W16 x40 Beam of grade 50 steel is laterally braced at 6 ft intervals and is subjected to a uniform bending Moment with Cb =1.0. Determine the Beam’s available flexural strength.

This is the Link to Post 13: Solved Problem 4- 6- how to find the available flexural strength?
You can view or download the Post 13 PDF by clicking the button below.
Solved problem 9-7-where Lb is bigger than Lr.
This is the 4th Post in the Steel Beam posts-part-2 series, including a solved problem from Prof. McCormack’s book. Here is the solved problem 9.7.

Using AISC Equation F2-4, determine the values of φb*Mnx and Mnx/ Ω for a W18x97 with fy=50 ksi and unbraced length Lb = 38 ft, assuming that cb =1.
This is the Link to Post 14: Solved problem 9- 7, where Lb is bigger than Lr.
You can view or download the Post 14 PDF by clicking the button below.
Step-by-step on how to use a design chart with a given Lbr?
This is the 5th steel Beam Post, part 2, which includes a solved problem from Prof. McCormack’s book.

How do you select a Beam with Lbr = 18 ‘, Cb = 1, Fy=50 ksi, Mult = 544.0 ft-kips, or Ma=362.0Ft-kips? This is a Link to Post 15: Step-by-step on using a design chart with a given Lbr.
You can view or download the Post 15 PDF by clicking the button below.
Solved problems 4- 7: design using Table 3-10 when Lb>Lr.
This is the 6th of the steel Beam posts, part 2, including solved problems 4-7 from Prof. Alan Williams’s book.

A supported grade 50 steel Beam has an unbraced length of 31 Ft. Determine the lightest adequate W-shape if the Beam is subjected to a uniform factored bending Moment of 190.0 ft-kips(LRFD) or 127.0 ft-kips (ASD), with Cb =1.0
This is the Link to Post 16: Solved problem 4-7– design using Table 3-10 when Lb>Lr.
You can view or download the Post 16 PDF by clicking the button below.
Please refer to the list of steel Beam posts (2a) to review the CB (coefficient) for steel Beam Moment.
Here is the Link to Chapter 8, “Bending Members.” A Beginner’s Guide to the Steel Construction Manual, 14th ed.
Here is the Link to Chapter 8, “Bending Members.” A Beginner’s Guide to the Steel Construction Manual, 15th ed.
Here is the Link to Chapter 8, “Bending Members.” A Beginner’s Guide to the Steel Construction Manual, 16th ed.
The Link to part 3 of the list of steel Beam posts is part 3.