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.
y = 0.85×(β 1 c) bf′ c Substitute for “c” from Eq. (6.6) and (6.7) and divide both sides by “bd”gives: Alim s bd = A ′ s bd +0.85×β 1 × f ′ c f y Á u Á u − d ′ d or à lim = à ′ s +0.85×β 1 × f ′ c f y × 87,000 f d ′ d if à actual >à lim then compression steel will yield this is common for shallow beams ...
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