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Chapter 11 Design of Beams (Sections 1 and 2)

Chapter 11 Design of Beams (Sections 1 and 2). Recall, with beams we have two stresses to deal with, normal stress, s , and shear stress, t. How are the design of these beams different???. Beam Recap:.

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Chapter 11 Design of Beams (Sections 1 and 2)

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  1. Chapter 11 Design of Beams (Sections 1 and 2)

  2. Recall, with beams we have two stresses to deal with, normal stress, s, and shear stress, t

  3. How are the design of these beams different???

  4. Beam Recap: • Beams are structural members designed to support loads applied perpendicular to longitudinal axis. • Must be sized adequatly to reduce both shear stress and bending stress as well as shear flow if beam fabricated with fasteners! • Shear stress – issue with wooden beams, short beams, beams with narrow sections (small t) or glued beams.

  5. Beam Recap Cont’d” • Bending stress – generally the stress designed to. Especially for long beams, steel beams, etc. • Recall: Let S = section modulus = I/c, then:

  6. Beam Design Summary: • Find shear and moment diagram – get Vmax and Mmax. Determine material and type of beam. • Calculate required section modulus using: • Calculate max shear stress to make sure ok: Design Cross-Section!!!! Optional: If fabricated with fasteners determine fastener spacing S =Fsd/q If glued, calculate shear stress at glue joint to make sure ok!

  7. EXAMPLES:

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