Design of steel steel beam or Channel with AISC 13th Ed.
Design code: AISC 13th edition, 2005.
Where Mu and Vu are factored moment and shear calculated based on strength design provision of building code. Mn and Vn are normal moment and shear strength calculated based on AISC 13th edition, f is resistance factor.
Where Ma and Va are moment and shear calculated based on allowable stress design provision of building code, Mn and Vn are normal moment and shear strength calculated based on AISC 13th edition, W is safety factor.
Determine factor moment Mu and factored shear, Vu
Factored moment and shear shall be determined by multiply moment and shear calculated from structural analysis by load factored based on load combination listed in building codes.
Loads and load combinations:
AISC 13th edition Section B2 states that loads and load combinations shall be based on applicable building code or use SEI/ASCE 7 in the absence of a building code.
Determine flexural strength , Mn and shear strength, Vn
Nominal flexural strength, Mn
Chapter F of AISC 13th edition cover flexural design of beams. The chapter is divided to 13 sections from F1 to F13.
The nominal flexural strength based on compact or non-compact section as well as their unsupported length. Compact or non-compact section is determined based on section porperties (b/t and h/tw). Unbraced length if depends how lateral supported is provided.
Hot rolled I shape or channel
Sections cover hot rolled hot rolled I shape sections are as follows
Section F2 cover compacted double symmetric compact I-shaped members and channels bend about their major axis.
Section F3 cover non-compacted double symmetric compact I-shaped members and channels bend about their major axis.
Section F6 cover I-shaped members and channels bend about their minor axis.
AISC 13th edition section L.3 states that deflection limit shall not impair the serviceability of the structures.
Acceptable deflection in most building codes
Deflection limits listed in most Building Code are
For cantilever beam, L is 2 time the length of cantilever.
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