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Reinforced Concrete Design Iftikhar Mahmood CECOS University 1/55
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Reinforced Concrete Design Iftikhar Mahmood CECOS University House House 2/55
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The Architect is the mother of the building The Architect is the mother of the building The builder is the nanny of the building The builder is the nanny of the building The Civil engineer is the Pediatrician The Civil engineer is the Pediatrician Reinforced Concrete Design Iftikhar Mahmood CECOS University 3/55
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The Job of a Civil Engineer The Job of a Civil Engineer –The safety of the building –The Expenditure (Budget) Reinforced Concrete Design Iftikhar Mahmood CECOS University 4/55
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Concrete Stress-Strain 16
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Design Stress Block 17
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Beam Flexural Resistance 18 Concrete is assumed to crush at a strain of 0.003 Replace non-linear variation of stress with the Whitney stress block 1 values are given in ACI Code Section 10.2.7.3
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Flexural Strain 19 cu tt c d-c d Strain diagram
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T-Beam The ACI Code (ACI- 8.10.2) prescribes a limit on the effective flange width B E of interior T-section to the smallest of the following: The ACI Code (ACI- 8.10.2) prescribes a limit on the effective flange width B E of interior T-section to the smallest of the following: B E = L/4 B E = L/4 B E = b w + 16 h f B E = b w + 16 h f B E = center – to – center spacing of beams B E = center – to – center spacing of beams Reinforced Concrete Design Iftikhar Mahmood CECOS University 49/55
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L-Beam For exterior T-sections, ACI-8.10.3 prescribes for effective width B E the smallest of the following : B E = b w + L/12 B E = b w + L/12 B E = b w + 6 h f B E = b w + 6 h f B E = = b w + 1/2 clear distance to next beam B E = = b w + 1/2 clear distance to next beam Reinforced Concrete Design Iftikhar Mahmood CECOS University 50/55
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Isolated T-Beam For isolated T- sections, ACI – 8.10.4 gives B E = = 1/2 b w B E = = 1/2 b w Reinforced Concrete Design Iftikhar Mahmood CECOS University 51/55
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