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Lab6sol - UNIVERSITY OF CALIFORNIA BERKELEY Department of...

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UNIVERSITY OF CALIFORNIA, BERKELEY Instructor: Khalid M. Mosalam Department of Civil and Environmental Engineering CE123: Design of RC Structures Structural Engineering, Mechanics and Material (SEMM) Spring Semester, 2009 CEE 123 Laboratory Project No. 6 (Solution) Problem 3.9 f '’ c =4000psi f y =60,000psi a) A s =3.81in 2 Æ f s =f y Æ f s <f y Thus, we need to find f s and to do that we solve the equilibrium of forces equation, which is a quadratic equation with the unknown being c as follows: Æ c=4.72in Thus, A s =3.81-1.58*(41/60)=2.73in 2 b) A s =5.08in 2 Æ f s =f y Æ f s <f y Thus, we need to find f s and to do that we solve the equilibrium of forces equation, which is a quadratic equation with the unknown being c as follows: Æ c=6.27in Thus, A s =5.08-1.58*(52/60)=3.71in 2 c) A s =6.00in 2 Æ f s =f y Æ f s <f y
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UNIVERSITY OF CALIFORNIA, BERKELEY Instructor: Khalid M. Mosalam Department of Civil and Environmental Engineering CE123: Design of RC Structures Structural Engineering, Mechanics and Material (SEMM) Spring Semester, 2009 Thus, we need to find f
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