Gusset > (Typ.)
7’- 0"
6
7
7
6
8
Detail L (Typ.)
PLAN
L’ s 4" x 4" x 1/4"
6
7
TOP WIND
8
BRACING
8’- 8"
Detail J (Typ.)
(LOOKING
DOWN)
9"
9"
WT 8" x 28.5 lbs/ft
6
7
8
7
6
8
Gusset > (Typ.)
All chords 5" x 5" x 3/8"
5’
5’
structural tube (Typ.)
7
6
8
L’s 4" x 4" x 1/4"
WT 8" x 28.5 lbs/ft
PLAN
BOTTOM WIND
BRACING
(LOOKING
DOWN)
4" Max. overhang
4" Max. overhang
1
Detail A
9"
L’s 5" x 5" x 5/16"
(Typ.)
10’(Typ.)
5’
Detail D
30"
(Typ.)
Gusset >
2
(Typ.)
2
30"
10’
(Typ.)
(Typ.)
A
B
A
B
L’s 5" x 5" x 5/16"
3
4
L’s 5" x 5" x 5/16"
5’
5" x 5" x 3/8"
L’s 5" x 5" x 5/16"
Detail K
Structural tube (top
4
Detail E
and bottom chord)
(Typ.)
L1
L2
L3
L4
L5
27’- 6"
25’- 0"
20’- 0"
25’- 0"
27’- 6"
Box truss,
Box truss,
Box truss,
Box truss,
Box truss,
end section
middle section
middle section
middle section
end section
125’- 0" Span
L
C
10" X 10" X 3/8"
structural tube (typ.)
ELEVATION
FACING
TRAFFIC
NOTE:
For details see typical plan SIGN-51O-SERIES
"Steel Truss Type D Details".
DEPARTMENT DI
RECTOR
MI
CHI
GAN DEPARTMENT OF TRANSPORTATI
ON
Ki
r
k T.St
eudl
e
BUREAU OF HI
GHW AY DEVELOPMENT STANDARD PLAN FOR
M ichigan Department of Transportation
STEEL
PREPARED
TRUSS
TYPE
D
APPROVED BY:
DIRECTOR, BUREAU OF FIELD SERVICES
(105
BY
ft
-
125
ft)
DESIGN DIVISION
DRAWN BY:
DHD
CHECKED BY:
AJU
09/15/11
08/11/11
F.H.W.A. APPROVAL
PLAN DATE
APPROVED BY:
DIRECTOR,
BUREAU
OF
HIGHWAY
DEVELOPMENT
SHEET
SIGN-500-A
1
OF
3
Truss Data
Estimated
Mass
Span
L1
L2
L3
L4
105’
22’- 6"
20’
20’
20’
22’-6" 1 7/8"
110’
22’- 6"
20’
25’
20’
22’-6"
115’
22’- 6"
25’
20’
25’
120’
27’- 6’
20’
25’
125’
27’- 6’
25’
20’
L5
Camber
Box
Truss
(lbs/ft)
*
*
7’ x 7’
206
7’ x 7’
206
22’-6" 2 1/4"
7’ x 7’
206
20’
27’-6’ 2 1/2"
7’ x 7’
206
25’
27’-6’ 2 5/8"
7’ x 7’
206
2"
The camber given in the above table is the ordinate at the center of the
assembled truss
truss
prior to dead load deflection. Allowable camber tolerance for
is < 25%
NOTES:
1.
The design of this structure is based on the AASHTO Standard Specifications for
StructuralSupports for Highway Signs, Luminaires and Traffic Signals.
projection of sign beyond
chord is 6’.
Maximum
All high strength galvanized bolts shall be
tightened by the turn of the nut method.
2.
All structural steel, bolts, welding and galvanizing shall be per the current MDOT
Standard Specifications for Construction.
3.
All truss
components shall be hot-dip galvanized prior to bolted assembly.
The
cambering shall be provided in the fabrication so that the flanges are correctly
sloped to assure obtaining full contact in the relaxed assembled position prior to
snugging up the flange bolts.
4.
The flange bolts shall not be tightened in an attempt to close any flange
misalignment.
Trusses shall not be lifted by the web members.
5.
See standard plan SIGN-7OO series for sign connection.
6.
The truss
section lengths tabulated may be increased in 5’ increments to
reduce
the number of field splices.
7.
The maximum section length shall not exceed 40’.
Any deviation from the details
shown on these standards will require approved shop
8.
drawings before fabrication.
Ultrasonic inspection of butt welded splices in column members shall be performed
by the fabricator.
9.
NOT
Maximum sign area is 500
TO
square feet for no more than three signs.
SCALE
MI
CHI
GAN DEPARTMENT OF TRANSPORTATI
ON
09/15/11
BUREAU OF HI
GHW AY DEVELOPMENT STANDARD PLAN
NOTE:
THE
ORIGINAL
SIGNED
COPY
IS
KEPT
ON FILE AT
THE
MICHIGAN DEPARTMENT
F.H.W.A. APPROVAL
OF
TRANSPORTATION.
08/11/11
PLAN
DATE
SHEET
SIGN-500-A
2
OF
3
7
1
3
7
1
1
3
5’
7
7
1
1
3
6
3
1
7
8
7
5’
1
2
3
7
1
4
5
7
ISOMETRIC VIEW
2
6
8
SHOWING
END
PART
OF
TRUSS
4
\ 5" x 5" x 3/8"
of structural tee
Bars 2 1/2" x 1/2"
5
7’
at ends only
4
6
4
Detail M
7’
Top
7’- 7"
2 1/2"
7’
7’- 7 1/2"
5"
Structural tube (Typ.)
Detail F (Typ.)
12’
12’
WT 8" x 28.5 lbs/ft
6
Optional splice
2 Equal spaces if
A-A
3 Equal spaces if
SECTION
Height varies (26’- 0" max.)
L 5" x 5" x 5/16"
3
3"
10" x 10" x 3/8"
Structural tube
L’s 6" x 6" x 3/8"
L’s 4’ x 4’ x 1/4"
7’
Detail N
7’
16"
8’- 8"
3
L 5" x 5" x 5/16"
END
Detail G (Typ.)
SECTION
NOT
TO
B-B
SCALE
MI
CHI
GAN DEPARTMENT OF TRANSPORTATI
ON
09/15/11
BUREAU OF HI
GHW AY DEVELOPMENT STANDARD PLAN
NOTE:
THE
ELEVATION
ORIGINAL
SIGNED
COPY
IS
KEPT
ON FILE AT
THE
MICHIGAN DEPARTMENT
F.H.W.A. APPROVAL
OF
TRANSPORTATION.
08/11/11
PLAN
DATE
SHEET
SIGN-500-A
3
OF
3