Lab3sol - 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. 3 (Solution) Alternative 1 t s1 =2in=0.17ft Alternative 2 t s2 =2in=0.17ft Alternative 3 t s3 =5in=0.42ft
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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 a) Equivalent Factored Dead Load Laboratory 2 System UDL g =2620lb/ft ULI g =1248.53lb/ft Combined Loading :UL g =UDL g +ULI g =3868.53lb/ft Alternative 1 (All member dimensions are the same as in Lab2-only the lengths change) G i r d e r h e i g h t h g =(18-2)/12=1.33ft Girder width w g =10/12=0.83ft Girder length l g =26ft+8/12=26.67ft Joists are spaced 2ft from center to center: W equiv =SW s +SW j =150lb/ft 3 (2ft*2/12ft+4/12ft*10/12ft)=91.67lb/ft (over the 2ft tributary width) Æ CW g =92lb/ft*TW g /spacing=92*20/2=916.7lb/ft Or alternatively, use a slab depth with the same area as the above figure, ie: d equiv =(24*2+4*10)/24=3.67in Concrete weight from slab and joist supported by girder CW g =150*d equiv *TW g =916.67lb/ft (same as above) Tributary width of girder TW g =20ft Applied Dead Load from Lab 2 DL add =55lb/ft 2 Distributed applied dead load acting on girder DL addg =DL add *TW g =1100lb/ft Self weight of girder per ft length SW g =(18-d equiv )*w g *150=149.31lb/ft NOTE : This method of calculation avoids the double counting of the concrete, which is at the location of the joist-girder intersection. Compare the 149.1lb/ft value obtained here with the
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Lab3sol - UNIVERSITY OF CALIFORNIA, BERKELEY Department of...

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