Transcription of Chapter 6. Compression Reinforcement - Flexural Members
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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.
Chapter 6. Compression Reinforcement - Flexural Members ... Text Section 5.7; ACI 318, Sections: 10.3.4, 10.3.3, and 7.11.1 6.2. Strength Calculations b strains stresses forces Tb s Á s =Á y Á s′ Á u =0.003 0.85f c′ a Cc b =β 1 c b Cs Ab s A’s cb h d d’ d-cb h-cb From geometry we can find the strain in compression steel at failure as:
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