Civil Engineering Reference
In-Depth Information
In-Plane Bending for 3 Bracing
Chord crown SCF:
Equation (3.121)
Brace crown SCF:
Equation (3.123)
B
C
A
Unbalanced Out-of-Plane Bending for 3 Bracing
Chord saddle SCF adjacent to diagonal brace A:
⋅
0
:
5
exp
ð−
SCF
= ½
Equation
ð
3
:
124
Þ
A
½
1
−
0
:
08
ðβ
B
γ
Þ
0
:
8x
AB
Þ
0
:
5
exp
ð−
½
1
−
0
:
08
ðβ
C
γ
Þ
0
:
8x
AC
Þ + ½
Equation
ð
3
:
124
Þ
B
0
:
5
exp
ð−
0
:
5
exp
ð−
(3.140)
½
1
−
:
08
ðβ
A
γ
Þ
:
8x
AB
Þ½
2
:
05
ðβ
max
Þ
:
3x
AB
Þ
0
0
1
0
:
5
exp
ð−
+ ½
Equation
ð
3
:
124
Þ
C
½
1
−
0
:
08
ðβ
A
γ
Þ
0
:
8x
AC
Þ
0
:
5
exp
ð−
½
2
:
05
ðβ
max
Þ
1
:
3x
AC
Þ
where
+
ζ
AB
sin
θ
A
x
AB
=
1
(3.141)
β
A
ðζ
AB
+ ζ
BC
+ β
B
Þ
sin
θ
A
x
AC
=
1
+
(3.142)
β
A
Chord saddle SCF adjacent to central brace A:
⋅
0
:
5
exp
ð −
SCF
= ½
Equation
ð
3
:
124
Þ
B
½
1
−
0
:
08
ðβ
A
γ
Þ
0
:
8x
AB
Þ
m
⋅
0
:
5
exp
ð −
½
1
−
0
:
08
ðβ
C
γ
Þ
0
:
8x
BC
Þ
m
+ ½
Equation
ð
3
:
124
Þ
A
0
:
5
exp
ð −
0
:
5
exp
ð−
½
1
−
0
:
08
ðβ
B
γ
Þ
0
:
8x
AB
Þ ½
2
:
05
ðβ
max
Þ
1
:
3x
AB
Þ
⋅
½
1
−
0
:
08
ðβ
B
γ
Þ
0
:
5
exp
ð−
0
:
8x
BC
Þ
+ ½
Equation
ð
3
:
124
Þ
C
0
:
5
exp
ð−
½
2
:
05
ðβ
max
Þ
1
:
3x
BC
Þ
ð
3
:
143
Þ
where
2
m
= ðβ
A
/
β
B
Þ
+
ζ
AB
sin
θ
A
+
ζ
BC
sin
θ
B
x
AB
=
1
and x
BC
=
1
β
B
β
B
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