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Unformatted text preview: 1 Ch. 3 Slide Ch. 4 – Flexure Part III • Reading: – Section 4-5: Definition of Balanced Conditions (pp. 128-130) – Section 4-7: Beams with Compression Reinforcement (pp. 139-141) – Section 4-8: Analysis of Flanged Sections (pp.147-150) • Problems: Class problems • Homework 2: posted on WebCt due date: TUE 26 OCT 2 Ch. 3 Slide Reinforcement Ratios d h A s b A s ’ d’ M n ? 0.003 (c) cu ε = cu bal cu y c d ε ε ε = + Tension reinforcement ratio: Compression reinforcement ratio: ' ' s A bd ρ = s A bd ρ = Example: determine the tension reinforcement ratio ρ b = A sb / (bd) at the failure balanced condition in a singly reinforced rectangular beam (a) Strain profile (b) Stresses (c) Section forces s y y s f E ε ε = = bal c y f ' 0.85 c f 1 bal bal a c β = c C T sb y A f = ' 0.85 c bal f a b = From strain diagram: 1 cu bal cu y a d ε β ε ε → = + Equilibrium of horizontal forces: ' 0.85 c c bal sb y C T f a b A f = → = ' 0.85 c sb bal y f A a b f = ' 0.85 sb c...
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This note was uploaded on 04/09/2012 for the course SE 151A taught by Professor Restrepo during the Spring '12 term at UCSD.
- Spring '12