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Ch. 4 &acirc;€“ Flexure Part II

# Ch. 4 &acirc;€“ Flexure Part II - 1 Ch 3 Slide Ch 4...

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Unformatted text preview: 1 Ch. 3 Slide Ch. 4 – Flexure Part II • Reading: – Section 4-4: Analysis of Nominal Moment Strength for Singly Reinforced Beam Sections (pp. 122-128) – Section 4-5: Definition of Balanced Conditions (pp. 128-130) • Problems: – Study class problems and Book Examples 4-1 and 4-2. 2 Ch. 3 Slide Nominal Moment Strength, M n • Definition: M n is that calculated from internal forces using: (i) the idealized stress-strain relationship for steel reinforcement (ii) the equivalent rectangular stress block for concrete calibrated for an . ultimate compressive strain ε cu = 0.003 3 Ch. 3 Slide Nominal Moment Strength of Under-reinforced (Tensile-dominated) Singly Reinforced Rectangular Sections when concrete finally crushes ε s ≥ ε y = 0.003 (c) → f s = f y Recall, under-reinforced beam section: ( 29 ' 0.85 c f b a = s y A f = c for equilbrium of horizontal forces (see also slide 2 of Ch 4 Flexure 1 Handout): C T = ' c C 0.85 c s y T f b a A f = → = ?...
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Ch. 4 &acirc;€“ Flexure Part II - 1 Ch 3 Slide Ch 4...

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