Lab5sol - 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. 5 (Solution) Problem 3.2 w d =500plf w L =1200plf L=22ft f '’ c =3000psi f y =60,000psi ρ =0.6 ρ max Assume w o =w d =500plf and check this assumption and the end of design. w u =1.2(500+500)+1.6(1200)=3120plf (this could be obtained from Table A.4 as well) ρ =0.6 ρ max =0.6(0.0155)=0.0093 (could be obtained from Table A.5b) Since, ρ =0.6 ρ max assume Ф =0.9 (confirmed by Table A.4) d=h-2.5=16-2.5=13.5in Æ b=27.8in Use b=28in Check weight assumption w o =16*28*150/144=467plf which is less than assumed. A s = ρ bd=0.0093*27.8*13.5=3.49in 2 Use 3#10(#36) Æ A s =3.81in 2 Problem 3.4 d) M n =A s f y (d-a/2)=347ft.kip Є t =0.003(d-c)/c=0.003(d-a/ β 1 )/(a/ β 1 )=0.0066>0.005 Æ Ф =0.9 M design = Ф M n =0.9(347)=312ft.kips e) Ratio=312/133=2.35
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Lab5sol - UNIVERSITY OF CALIFORNIA, BERKELEY Department of...

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