Steel Structures Design
Transcript of Steel Structures Design
Beam Design
CE 4106 – Steel Structures Design
Lecture 17
Beam Design1. Compute Mu. A beam weight may be
assumed.
2. Using Zx Tables or Beam Design Charts,
select a shape and check. Repeat if select a shape and check. Repeat if necessary.
3. Check for shear strength. Select a new shape if necessary.
4. Check for deflections. Select a new shape if necessary.
Using Zx Tables
• Use Zx Tables only for beams with lateral support so that Lb < Lp.
M
y
ux F
MZ
φ≥
Using Beam Design Charts• Can be used for all cases.
• Enter curve with:
bu CMand select shape with higher
• Make sure that
bu CM
nMφ
pbn MCM φφ ≤×
Problem 5.10-2Use A992 steel and select the most economical W shape for the beam shown. The beam weight is not included in the service loads shown. Assume continuous lateral support.
Problem 5.10-3Use A992 steel and select the most economical W shape for the beam shown. The beam weight is not included in the service loads shown. Assume lateral support at the location of the point loads and a the ends.point loads and a the ends.