Homework # 3 - the moment vs curvature diagram assuming...

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1 CIVL 4080 Concrete Design Spring 2010 Home Work #3 Assigned: February 12 th Due: February 23 rd 1. A tensile-reinforced beam is characterized by a width b = 12 in, and an effective depth d = 20 in to the center of the bars, which are placed all in one row. If y f = 60,000 psi and c f = 5000 psi, find the nominal flexural strength n M , the factor, and the design strength n M for (a) s A = two No. 8 bars (b) s A = two No. 10 bars (c) s A = three No. 10 bars 2. For the reinforced concrete cross-section shown below, compute and plot ten points of
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Unformatted text preview: the moment vs curvature diagram assuming constitutive equations typically used at ultimate behavior. Also, compute and plot in the same graph the first cracking moment and the associated curvature. Use c f = 30 MPa, d = 0.5 m, y f = 400 MPa, t f = 3 MPa, c E = 4700 c f Hint: Assume max compressive strain in concrete equal to 10 u , 10 2 u , 10 3 u ,, u 3#7 0.3m 0.6m C Strain...
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