Transcription of Chapter 6. Compression Reinforcement - Flexural Members
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Chapter 6. Compression Reinforcement - Flexural Members
Chapter 6. Compression Reinforcement - Flexural Members If a beam cross section is limited because of architectural or other considerations, it may hap- pen that the concrete cannot develop the Compression force required to resist the give bending mo- ment. In this case, reinforcing is added in the Compression zone, resulting in a so-called doubly rein- forced beam, , one with Compression as well as tension Reinforcement . Compression reinforced is also used to improve serviceability, improve long term deflections, and to provide support for stir- rups throughout the beam. Reading Assignment: Text Section ; ACI 318, Sections: , , and Strength Calculations u = c . Cs A's s . a b = 1c b Cc d' cb h d A bs d-c b h-c b T bs b s = y strains stresses forces From geometry we can find the strain in Compression steel at failure as: s = c . c d ( ). CIVL 4135 118 Compression Reinforcement Nominal Resisting Moment When Compression Steel Yields d'.
CIVL 4135 119 Compression Reinforcement 6.3. Nominal Resisting Moment When Compression Steel Yields b Ts >Á y Á y Á u =0.003 0.85f c′ Cc Cs As A’s Cc a A s′f y A s′f y 0.85f c′ a + Doubly Reinforced Rectangular Beam T s =(A s −A s′)f y
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