Assignment_2_SOLUTION

# Assignment_2_SOLUTION - CE 441 Reinforced Concrete Design...

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CE 441 Reinforced Concrete Design – Assignment 2 SOLUTION Page 1 Name: _ SOLUTION _ _ _ _ _ _ _ _ _ _ _ _ _ CE 441 Reinforced Concrete Design – Assignment 2 Due Thursday September 10, 2009 The elastic modulus of steel reinforcement is E s =29,000 ksi Help session is on Monday at 5:30-7:30 PM in CAMP 176 1. For a rectangular beam of width b the tension steel is placed in one row at an effective depth d . Sketch the cross section. Compute the tension steel area corresponding to (a) balanced failure condition (A sb ), (b) the minimum design tensile steel strain of 0.004, and (c) for tension controlled failure with a design tensile steel strain of 0.005. Express your answers in terms of the variables b , d , f c ’, and β 1 (see Lecture 3 notes from 9/1/09). For cases (b) and (c) compute the ratio A s /A sb . Sketch the strain diagram for each case. 2. Calculate ρ , ρ b , a, M n , and Φ for a rectangular section that has a width b= 12 in. and an effective depth d= 22 in. f

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Assignment_2_SOLUTION - CE 441 Reinforced Concrete Design...

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