Design Summary

 

Typical Sequence

1. use bending to estimate size of beam

required S = M/F'_b or M_u/F'_bn

CE 110 examples: 8.38, 8.39, 8.39 video

2. check shear

revise beam size if unsatisfactory  (required A = 1.5V/F'_v)

3. check deflection

revise beam size if unsatisfactory

 

Most Economical  (in homework)

satisfy bending, shear and deflection with minimum A

board foot = 1" x 12" x 12"

 

Other Sizing Considerations

1. detailing  (fit in the structure, connect to other members)

2. uniformity with other members  (convenient for detailing, ordering and construction)

3. availability of sizes and grades