BRAE433 - Chapter 2b

BRAE433 - Chapter 2b - Chapter 2 RC Design Evaluation and...

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1 Chapter 2 – RC Design Evaluation and Design RC Rectangular Beam Problems ITRC Cal Poly Part 2 Ultimate Moment, M n As = Area of steel Tables A-1 and A-2 Fig 1-1 BRAE/ITRC Cal Poly Also called the nominal moment strength Point just prior to failure of the beam
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2 Ultimate Moment Theoretical internal resultant forces N and N BRAE/ITRC Cal Poly Theoretical internal resultant forces ,N C T Parallel, equal and opposite Separated by distance Z internal resisting couple = ultimate moment (or nominal moment strength) Ultimate Moment BRAE/ITRC Cal Poly To solve, need to calculate the resultant force N C in the concrete determine its location in the beam
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3 Equivalent Stress Distribution BRAE/ITRC Cal Poly Beta vs. fc' 0800 0.850 0.900 β 1 = 0.85 for fc’ 4000 psi β =085 005(fc’ 4000)/1000 0650 0.700 0.750 0.800 Beta 1 = 0.85 – 0.05 (fc -4000)/1000 for fc’ > 4001 psi to 0.65 BRAE/ITRC Cal Poly 0.600 0.650 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 fc' (psi)
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4 Isometric View of the Internal Couple BRAE/ITRC Cal Poly Ready to Solve for M n BRAE/ITRC Cal Poly
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BRAE433 - Chapter 2b - Chapter 2 RC Design Evaluation and...

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