Title Day-65-Steel-Design-Flexure-Members (2).pdf ✅

PRINCIPLES OF STRUCTURAL ANALYSIS AND DESIGN presented by: Engr. Mansour P. Aguas Kippap Civil Engineering STEEL DESIGN 2
DESIGN PRINCIPLE A beam is an element which primarily carries transverse loads. Thus, bending moment governs its strength. moment due to loads ≤ moment strength of section For the ultimate moment strength of the beam using LRFD: Mu ≤ ∅Mn For the allowable moment strength of the beam using ASD: Ma ≤ Mn Ω For flexural members: ∅ = 0.90 LRFD Ω = 1.67 ASD STEEL DESIGN FLEXURE MEMBERS DAY 65: STEEL DESIGN: FLEXURE MEMBERS “Steel bends but does not break. Like great engineers — resilient under pressure.”

LIMIT STATES OF BEAMS: YIELDING The computation of strength of beams when yielding is involved uses plastic analysis on the section of the beam. Ft Fy Fc Fy Fy Fy NA Elastic Region Plastic Region Plastic Region Section of beam experiencing positive moment Beam fibers under elastic stress f = My I Outer beam fibers reached the yielding strength of the beam All beam fibers reached the yielding strength of the beam DESIGN PRINCIPLE STEEL DESIGN FLEXURE MEMBERS DAY 65: STEEL DESIGN: FLEXURE MEMBERS “Steel bends but does not break. Like great engineers — resilient under pressure.”