This preview shows pages 1–3. Sign up to view the full content.
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
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentUNIVERSITY 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 Lab2only the lengths change)
G
i
r
d
e
r
h
e
i
g
h
t
h
g
=(182)/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
=(18d
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 joistgirder intersection. Compare the 149.1lb/ft value obtained here with the
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '09
 Mosalam
 Structural Engineering, Environmental Engineering

Click to edit the document details