Ch 2 - Part 3

Ch 2 - Part 3 - 1 Chapter 2 RC Design Evaluation and Design...

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Unformatted text preview: 1 Chapter 2 RC Design Evaluation and Design RC Rectangular Beam Problems BRAE/ITRC Cal Poly Part 3 Strength Design Factored Loads U = 1.2D + 1.6L 1.4D strength furnished strength required BRAE/ITRC Cal Poly U 1.2D + 1.6L 1.4D Note: D and L are service loads 2 Strength Reduction Factor = 0.9 bending = 0.75 shear BRAE/ITRC Cal Poly Practical moment strength = Mn Strength Reduction Factor = special case, y < 0.005 Beta vs. fc' 0.900 y < 0.005 y 0.700 0.750 0.800 0.850 Beta BRAE/ITRC Cal Poly 0.600 0.650 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 fc' (psi) 3 Beam Analysis 14,000 lbs Given 2-3ss: fc = 4,000 psi, A615 grade 60 steel wLL = 800 lb/ft Plus wDL = 800 lb/ft BRAE/ITRC Cal Poly Steps to Solve Ultimate Moment, M n 1. N C = N T N c = 0.85 fc a b, N T = A s fy C T c T s 2. 0.85 fc a b = A s fy 3. solve for a = A s x f y / (0.85 x f c x b) 4. Z = d a/2 5. solve for M n = N C (d a/2) BRAE/ITRC Cal Poly 4 Rectangular Beam Evaluation write M n equation in terms of b, d, and As given A s , b and d ( =A s /bd) M n = bd 2 k /12 (k in Tables A-7 through A-11) solve for M solve for M n 1) Givens: b = 12 in, d = 17.5 in, A s = 4.0 in 2 , f c = 4,000 psi, fy = 60,000 psi 2) Get = A s /bd and Get k : k = 0.949 ksi ( = 949 psi) 3) Check based on t where = 0.65 + ( t- 0.002) x (250/3) BRAE/ITRC Cal Poly...
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This note was uploaded on 01/13/2011 for the course BRAE 433 taught by Professor Styles during the Fall '10 term at Cal Poly.

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Ch 2 - Part 3 - 1 Chapter 2 RC Design Evaluation and Design...

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