Civil Engineering Reference
In-Depth Information
The reduced live load for positive moments is
15
KA ft
LL
:LL .25
=
⋅
+
=70psf
⋅
Pos
o
−
2
⋅
⋅
LL
TPos
The reduced live load for negative moments is
15
KA
LL
:LL .25
=
⋅
+
= 56.8psf
⋅
Neg
o
−
2
⋅
⋅
ft
LL
TNeg
The reduced live load cannot be less than 50% of the unreduced live load
for members supporting one floor.
“OK” if LL 0.50 LL
“Not OK”otherwise
≥
⋅
Pos
o
CheckLL
:
=
Pos
CheckLL
Pos
= “OK”
“OK”
if
LL
≥
0.50 LL
⋅
Neg
o
CheckLL
:
=
Neg
“Not OK”otherwise
CheckLL
Neg
= “OK”
The dead load per unit length (including the beam's self-weight) is
kip
ft
(
)
(
)
w:DL
=
⋅
l
⋅
.5+l
⋅
0.5+1.2hb
⋅
⋅
⋅ ρ
= 2.31
⋅
D
t1
t2
w
c
The live load per unit length for computing maximum positive moments is
kip
ft
(
)
w:
=
LL
⋅
l
⋅
.5+l
⋅
0.5=1.3
⋅
LPos
Pos
t1
t2
The live load per unit length for computing maximum negative moments is
kip
ft
(
)
w:
=
LL
⋅
l
⋅
.5+l
⋅
0.5=1.05
⋅
LNeg
Neg
t1
t2
The governing load combination for computing the total factored load,
w
TFL
, is load combination Equation (9-2) defined in ASCE 7-10. Total fac-
tored load for positive moments is
kip
ft
w:
1.2w
+1.6 w=4.84
⋅
⋅
=
TFLPos
D
LPos
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