Civil Engineering Reference
In-Depth Information
TABLE E7.14
Shear Forces along the Span
Location
Distance,
x
,
+
V
LL
−
V
LL
(kips)
V
DL2
V
r
V
max
(Figure E7.6)
From End
a
(in.)
(kips)
(Linear Interpolation)
(kips)
(kips)
(kips)
A
0
275
0
40
310
417
B
270
158
37
20
220
287
C
540 (center)
74
74
0
167
203
275 k
158 k
74 k
74 k
37 k
a
b
c
x
2 @ 270
"
= 540
"
FIGURE E7.6
Shear forces from live load along the span.
Shear Stud design
Only unshored construction is considered in the shear stud design for
brevity. Similar calculations may be performed if a shored construction
method is utilized.
Alsoforbrevity,shearstudspacingwillbecalculatedatonlythreelocations
on the girder as indicated in Table E7.14 (in the design of practical girders, a
smaller interval is recommended
∗
).
The negative live load shear flow (the shear reverses when a wheel passes
over a stud) is estimated to be a linear interpolation of the center span live
load shear as shown in Figure E7.6.
The shear flow at the steel-concrete interface (
Table E7.15)
is
V
LL+I
Q
cp
(n
=
8
)
3242
(V
LL
+
I
)
386,516
V
LL
+
I
119
q
LL+I
=
=
=
,
I
cp
(n
=
8
)
V
DL2
Q
cp
(n
=
24
)
V
LL
+
I
119
1506
V
DL2
299,065
q
max
=
q
LL+I
+
q
DL2
=
q
LL+I
+
=
+
I
cp
(n
=
24
)
V
LL
+
I
119
V
DL2
199
.
=
+
∗
Equivalent uniform load charts (such as Steinman charts) are useful in determining live load shear forces
at various locations along the span.
