751.13 Expansion Devices

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Contents

751.13.1 Expansion Devices

751.13.1.1 General

The number of movable deck joints in a structure should be minimized. Deck joints should be avoided over roadways, railroads, sidewalks, other public areas, and at the low point of sag vertical curves.

Consult the Structural Project Manager, if the use of special covering floor plates in shoulder areas should be considered.

If no expansion device is specified in the Design Layout, but due to the length of structure an expansion device is required, consult the Structural Project Manager for the type to be used. The roadway surface gap, W, (Except Flat and Finger Plates) in a transverse deck joint, measured in the direction of travel shall satisfy:

For single gaps:

1" ≤ W ≤ 4"
EXPANSION JOINT SELECTION
 Allowable MovementAllowable Skew
Preformed Compression Joint Seal0 – 2”≤ 20˚
Strip Seals2” to 4”≤ 45˚
Flat Plate > 45˚
Finger Plate 


Movement Calculation (in the direction of travel)

\, \triangle = \gamma (coefficient)(temperature\ range)(actual\ expansion\ length)

\, \gamma = Load factor for temperature movement

Coefficients, (\, \alpha )

Steel: Thermal - 0.0000065 ft/ft/F°
Concrete: Thermal - 0.0000060 ft/ft/F°

Temperature Range From 60°F, (\, \alpha )

Temperature Range is based on a design installation temperature of 60°F.

  Rise Fall Range
Steel Structures60°F90°F150°F

(From -30° to 120°)

Concrete Structures50°F70°F120°F

(From -10° to 110°)


Actual Expansion Length, (L)

When Expansion joints are used for long span structures with deep girders, movement calculations should also consider the bearings and possible resulting girder rotation.

Installation Width
The installation width, gap, should be adjusted for temperatures above or below the design installation temperature. Movement for a 10°F change in temperature should be indicated on the plans to the nearest 1/16” by using the appropriate note.


Movement for 10°F change in temperature = (α)(10°F)(L)(Cos θ)

751.13.1.2 Expansion and Contraction Length

Image:751.13 Expansion and Contraction Lengths.gif

Note:

Image:751.13 circled 1.gif = Expansion and contraction length.

For configurations not shown, a temperature force distribution analysis may be necessary to estimate the point of thermal origin.

751.13.1.3 Expansion Device on Skewed Curved Structures

Expansion Device on Skewed Curved Structures

Add the “Section Thru Centerline Expansion Gap” and the Table shown below to the Expansion Device sheet for skewed curved structures.

Image:751.13 Expansion Device on Curved Structures- Part Plan.gif


PART PLAN


Image:751.13 Expansion Device on Curved Structures- Section At Expansion Gap.gif


SECTION THRU \, \ C_{\!\!\!\!L} EXPANSION GAP


BENT NO.GRADE ELEVATIONANGLEHORIZONTAL DIMENSIONS
LEFT GUTTER LINE\, \ C_{\!\!\!\!L} RDWY.RIGHT GUTTER LINE
"A""B""C""D""E""F"
          
          
          
          
          

751.13.1.4 Details of Substructure Protection

A protective coating shall be applied to concrete surfaces exposed to drainage from the roadway. Indicate surface to be coated on plans. Urethane resembles black tar which is used where aesthetics is not a concern, otherwise use epoxy.

Image:751.13 Details of Substructure Protection- Part Elevation & Section A-A.gif

Image:751.13 Details of Substructure Protection- Part Elevation & Section B-B.gif

Note: Epoxy coat all reinforcement in end bents with expansion joint system.

751.13.2 Silicone Expansion Joint Sealant

Silicone expansion joint sealant systems (SEJS) shall not be used for normal contract new or rehabilitation jobs effective November 2011. This system is considered a short term sealing solution primarily good for maintenance operations.

SEJS may be considered for special situations when agreed upon by both the district bridge engineer and Bridge Division. Examples include short deck spans, sawed joints or situations where contracted joint work is intended to supplement MoDOT’s bridge maintenance work scheduling (maintenance type applications).

Archived SEJS details including armor and reinforcing steel details are available upon request from the Bridge Division.

751.13.3 Preformed Compression Joint Seal

751.13.3.1 General

The system can be used for movements up to 2" with skews ≤ 20°.

Image:751.13 Performed Compression Joint Seal- Section Thru Joint.gif

PART CROSS-SECTION THRU EXPANSION JOINT

TABLE OF TRANSVERSE BRIDGE SEAL DIMENSIONS
SEAL WIDTH (Wn)Image:751.13 circled 1.gifImage:751.13 circled 2.gifREQUIRED MOVEMENT RANGE (M \, \bot)MIN. JOINT WIDTH (\, \bot TO JOINT)MAX. JOINT WIDTH (\, \bot TO JOINT)
2.5"1 9/16"MANUFACTURER'S RECOMMENDED HEIGHT1.00"1.13"2.13"
3.0"1 7/8"MANUFACTURER'S RECOMMENDED HEIGHT1.20"1.34"2.55"
3.5"2 3/16"MANUFACTURER'S RECOMMENED HEIGHT1.40"1.58"2.98"
4.0"2 7/16"MANUFACTURER'S RECOMMENED HEIGHT1.65"1.75"3.40"
4.5"2 13/16"MANUFACTURER'S RECOMNENED HEIGHT1.80"2.03"3.83"

Size of Armor Angle:
Vertical leg of angle shall be a minimum of Image:751.13 circled 2.gif + 3/4", horizontal leg of angle shall be a minimum of 3". Minimum thickness of angle shall be 1/2".

Check 1" ≤ w ≤ 4" after select seal size, w = gap at top slab in the direction of travel, in inch.

751.13.3.2 Steel Structure Details

Image:751.13 Steel Structure Details at End Bents- Section B-B.gif



SECTION B-B


Image:751.13 Steel Structure Details at End Bents- Part Plan.gif


PART PLAN


Image:751.13 Steel Structure Details at End Bents- Detail B.gifImage:751.13 Steel Structure Details at End Bents- Detail A.gif
DETAIL "B"DETAIL "A"

751.13.3.3 Prestressed Structure Details

Image:751.13 Prestressed Structure Details- Section B-B.gif

SECTION B-B


Image:751.13 Prestressed Structure Details- Part Plan.gif

PART PLAN

Image:751.13 Prestressed Structure Details- Detail B.gifImage:751.13 Prestressed Structure Details- Detail A.gif
DETAIL "B"DETAIL "A"

751.13.3.4 Barrier Curb Details

Part Section A-A * Extend preformed compression joint seal 3” past edge of slab (Typ.) Note: Drainage details should be handled similar to drainage details for strip seals.
Part Section A-A
* Extend preformed compression joint seal 3” past edge of slab (Typ.)
Note: Drainage details should be handled similar to drainage details for strip seals.
Part Elevation of Barrier Curb
Part Elevation of Barrier Curb
Square Structure
Square Structure
Skewed Structure Note: The working point is always placed on the front face side of backwall at the gutter line.
Skewed Structure
Note: The working point is always placed on the front face side of backwall at the gutter line.

751.13.3.5 Sidewalk Details

Image:751.13 Sidewalk Details- Part Section Thru Center of Expansion Device.gif

PART SECTION THRU CENTER OF EXPANSION DEVICE


Image:751.13 Sidewalk Details- Part Section A-A.gif


PART SECTION A-A


(*) See Project Manager for direction of slope.

751.13.3.6 Double Faced Median Barrier Bridge Curb

Part Section A-A Note: Use continuous joint seal thru the median barrier curb only when slab cross slope slopes away from curb or slab is superelevated.
Part Section A-A
Note: Use continuous joint seal thru the median barrier curb only when slab cross slope slopes away from curb or slab is superelevated.
Part Elevation of Barrier Curb
Part Elevation of Barrier Curb

751.13.4 Strip Seal Expansion Joint System

751.13.4.1 General

Strip Seal Expansion Joint Systems should be used for movements greater than 2” and less than 4” for skews < 45°. Use flat plate expansion devices on curved structures and skews over 45°.

The installation width, gap = 2”, based on a design installation temperature of 60°F.

On skewed bridges, the strip seal expansion devices must be checked for parallel and perpendicular movements. Parallel movements (Racking) shall be less than 1 ½” for either rise or fall movements. Maximum skew shall be 45°.

Formulas: M = 1.2(ΔT)(α)(L) : Bridge total movement or individual rise and fall movements

ΔT = Corresponding temperature range
L = Expansion length
α = Coefficient of linear expansion

M\, \bot = M cos θ : Movement perpendicular to joint
M\, \ || = M sin θ : Movement parallel to joint

θ = skew angle
Image:751.13.4 Strip Seal Expansion Joint- Longitudinal Axis.gif

Gland Size

Strip Seal Gland SizeGap at Top Slab (60°F)Min. Joint Width (\, \bot to Joint)Max. Joint Width (\, \bot to Joint)Max. Gap (\, \ || \ C_{\!\!\!L} Rdwy)
3”2”1”3”4”
4”2”1”4”4”

751.13.4.2 Gland Extrusion Details

Image:751.13 Strip Seal Expansion Joint- Detail of Joint Armor.gif


DETAIL OF JOINT ARMOR


Image:751.13 Strip Seal Expansion Joint- Detail of Gland.gif


DETAIL OF GLAND

751.13.4.3 Joint System Details (Steel Structures)

SECTION B-B
* Do not show dimension on plans.


Image:751.13 Strip Seal Expansion Joint System- Joint System Details at End Bent Part Plan.gif


PART PLAN


Image:751.13 Strip Seal Expansion Joint System- Joint System Details at End Bent Detail A.gif

DETAIL "A"

Image:751.13 Strip Seal Expansion Joint System- Joint System Details at End Bent Detail B.gif


DETAIL "B"


(**) Dimension required to clear bearing stiffener (1 1/2" Min.). (Dimension to be shown on plans)


Image:751.13 Strip Seal Expansion Joint System- Joint System Details at Int Bent Section B-B.gif


SECTION B-B


Image:751.13 Strip Seal Expansion Joint System- Joint System Details at Int Bent Part Plan.gif


PART PLAN


Image:751.13 Strip Seal Expansion Joint System- Joint System Details at Int Bent Detail A.gif

DETAIL "A"

Image:751.13 Strip Seal Expansion Joint System- Joint System Details at Int Bent Detail B.gif


DETAIL "B"

(**) Dimension required to clear bearing stiffener (1 1/2" Min.). (Dimension to be shown on plans)

751.13.4.4 Joint System Details (Prestressed Structures)

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at End Bents Section B-B.gif

(**) 3/4" Min. (Do not show on plans.)

SECTION B-B

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at End Bents Part Plan.gif

PART PLAN

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at End Bents Detail B.gifImage:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at End Bents Detail A.gif
DETAIL "B"DETAIL "A"

(*) Dimension required along centerline of girder (Dimension to be shown on plans).

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at Int Bents Section B-B.gif

(**) 3/4" Min. (Do not show on plans.)

SECTION B-B

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at Int Bents Part Plan.gif

PART PLAN

Image:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at Int Bents Detail B.gifImage:751.13 Strip Seal and Expansion Joint System- Joint System Details for Prestress at Int Bents Detail A.gif
DETAIL "B" DETAIL "A"


(*) Dimension required along centerline of girder (Dimension to be shown on plans).

751.13.4.5 Barrier Curb Details

Part Elevation of Barrier Curb
Part Elevation of Barrier Curb
Section Thru Joint
Section Thru Joint
Part Plan (Square Bridge)
Part Plan (Square Bridge)
Part Plan (Skewed Bridge) * Working Point is always at front face of backwall at gutterline.
Part Plan (Skewed Bridge)
* Working Point is always at front face of backwall at gutterline.


Barrier Curb at End Bents

Elevation
Elevation
Part Section A-A
Part Section A-A
Part Plan B-B (Square)
Part Plan B-B (Square)
Part Plan B-B (Skewed)
Part Plan B-B (Skewed)

751.13.4.6 Double Faced Median Barrier Curb Details

For details not shown of median barrier bridge curb, see the safety barrier curb details, Design Division Standard Plans (Concrete Median Barrier) and Bridge Design Layout.

Part Section A-A Note:  Use continuous strip seal thru median curb only when slab cross slope slopes away from curb or slab is superelevated.
Part Section A-A
Note: Use continuous strip seal thru median curb only when slab cross slope slopes away from curb or slab is superelevated.
Part Elevation of Barrier Curb
Part Elevation of Barrier Curb

751.13.4.7 Drainage Details

In order for strip seal expansion joint systems to function properly, the gland shall be allowed to drain to prevent build-up of debris. Debris may punch holes in the gland and the extra load may possibly pull the gland from the extrusions.


To prevent debris buildup on the strip seals the gland should not be turned up at the barrier curb. Instead, the steel armor with extrusions should be extended to the face of the slab through the barrier curb.


Drainage shall be handled by one of two methods. The first method is to let the water run off the gland and free fall to the ground below. The gland should extend past the edge of slab 3 inches minimum. At intermediate bents, the bent cap should have a protective coating applied to prevent moisture saturation of the concrete. On structures where there is an adjacent structure separated by a median barrier curb with an open joint (Type D or Split Median) the gland should be terminated at some point under the curb at all bent types and protective coating should be applied at all faces exposed to moisture. The second method of drainage is to provide a fiberglass pipe drainage system to collect water at the bents.


See the Structural Project Manager for the method of drainage to be used. The following pages provide some possible details that may be used for strip seal expansion joint drainage systems.

If the fiberglass pipe drainage system is used, payment will be made under the pay item. Drainage System (On structure), Lump Sum.


Option #1- No Drainage System, at End Bent




Option #1- No Drainage Sytem, at Split Median Barrier Curb at Intermediate Bent


Image:751.13 Strip Seal Expansion Joint System- No Drainage System Split Median Barrier Curb- Option 1.gif


Option #2 - One-Piece Drain System at End Bent


Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System End Bent- Option 2- Front Elev.gif

FRONT ELEVATION


Image:751.13_Strip_Seal_Expansion_Joint_System-_One_Piece_Drain_System_End_Bent-_Option_2.gif


PART SECTION A-A


Image:751.13_Strip_Seal_Expansion_Joint_System-_One_Piece_Drain_System_End_Bent-_Option_2-_Side_Elevation.gif

SIDE ELEVATION


Option #2 - One-Piece Drain System, Split Median Barrier Curb at End Bent

Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Split Median Barrier Curb- Option 2- Front Elev.gif


FRONT ELEVATION


Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Split Median Barrier Curb- Option 2- Section thru Bent.gif


SECTION THRU BENT


Option #2 - One-Piece Drain System, Intermediate Bent


Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Int Bent- Option 2- Front Elev.gif

Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Int Bent- Option 2- Detail A.gif

DETAIL A

(Optional)


Option #2 - One-Piece Drain System at Split Median Barrier Curb at Intermediate Bent

Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Split Median Barrier Curb at Int Bent- Option 2- Section thru Bent.gif

SECTION THRU JOINT


Note: If dropping water to ground from bottom of beam is not allowed, an additional pipe system shall be used.

Image:751.13 Strip Seal Expansion Joint System- One Piece Drain System Split Median Barrier Curb at Int Bent- Option 2- Section A-A.gif

SECTION A-A


Option #3 - Three-Piece Drain System at Split Median Barrier Curb at Intermediate Bent

Image:751.13 Strip Seal Expansion Joint System- Three Piece Drain System Split Median Barrier Curb at Int Bent- Option 3- Section Thru Joint.gif

SECTION THRU JOINT

Image:751.13 Strip Seal Expansion Joint System- Three Piece Drain System Split Median Barrier Curb at Int Bent- Option 3- Section B-B.gif

SECTION B-B


Image:751.13 Strip Seal Expansion Joint System- Three Piece Drain System Split Median Barrier Curb at Int Bent- Option 3- Section C-C.gif

SECTION C-C


Image:751.13 Strip Seal Expansion Joint System- Three Piece Drain System Split Median Barrier Curb at Int Bent- Option 3- Section D-D.gif

SECTION D-D

(*)Varies (Space holes to clear B1 bars in P/S girders. Use 6" for plate girders.)


Image:751.13 Strip Seal Expansion Joint System- Three Piece Drain System Split Median Barrier Curb at Int Bent- Option 3- Section E-E.gif

SECTION E-E

751.13.4.8 Polymer Concrete

Strip Seal Expansion Joint System may be used on rehabilitation projects where other expansion devices need to be replaced. Consult with Structural Project Manager about the use of polymer concrete with strip seals. Strip seal is to be designed with the same requirements as a normal strip seal expansion joint system.

Image:751.13 Strip Seal Expansion Joint System- Polymer Concrete- Detail A.gif

Note: Anchorage system shall be welded to strip seal steel armor with appropriate weld to meet AASHTO Fatigue for connection.

Image:751.13 Strip Seal Expansion Joint System- Polymer Concrete- Detail of Sinusoidal Bar.gif


DETAIL OF SINUSOIDAL BAR
Note: A pay item exists for this type of expansion joint system. The system will be paid for under Strip Seal Expansion Joint System per linear foot. Polymer Concrete will be paid for under Polymer Cocrete per cubic foot.

Image:751.13 Strip Seal Expansion Joint System- Polymer Concrete- Detail of Shear Connector.gif

DETAIL OF SHEAR CONNECTOR

(Alternate #4 reinforcing bar shall be bent similarly)

751.13.5 Flat Plate Expansion Devices

751.13.5.1 General

Flat Plate Expansion Joint System should be used where Strip Seals and Preformed Compression Joints can not be used due to large expansion lengths or curved structures or skews over 45˚.

The installation width, sub-surface gap = 3 1/2 in. is based on a design installation temperature of 60˚F.

Design movement for Flat Plate Expansion Devices is limited by the following criteria:

1. Full closure of surface gap.
2. Min. sub-surface gap = 1 in. (┴ to joint)
3. Min. plate overlap = 1 1/2 in. (┴ to joint)
Note: Criterion 3 controls for standard details for both concrete and steel superstructures. Originally, the details for EPG 751.13.5 used a 3/4 in. x 7/8 in. bar, that allowed for a 2 ½ in. gap contraction (┴ to joint). Functionally, the 3/4 in. x 7/8 in. bar is preferred but it is not available domestically as of July 2010. A 7/8 in. x 7/8 in. bar is shown as the standard in EPG 751.13.5 primarily due to domestic availability.

Flat Plate expansion devices can be used bridges of any skew.

Maximum Expansion Length1
SkewConcrete BridgeSteel Bridge
496 ft.356 ft.
10°504 ft.362 ft.
20°528 ft.379 ft.
30°573 ft.411 ft.
40°648 ft.465 ft.
50°772 ft.554 ft.
60°992 ft.712 ft.
1 This table is applicable for standard details found in EPG 751.13.5 and for joints where movement is expected from one side of the joint. When movement is expected from both sides of the joint, the sum of the expansion lengths participating at a joint should not exceed the values in this table. When larger expansion lengths are required, the surface gap, sub-surface gap and flat plate dimensions shall be determined by design.

The max. surface gap requirement, W ≤ 4 in. is not considered for flat plate expansion devices since the surface gap neither impairs the riding characteristics of the roadway, nor damages vehicles nor destroys the function of the joint.

Dimensions shown are perpendicular to centerline of joint and do not vary with skew.

Part longitudinal sections for bridges on grades or verticle curves having a plate type intermediate expansion device shall be detailed with the expansion plate anchor to the long span side. If equal spans, then place expansion plate anchor on the high side. For bevel plate and permissible field splice details, see Bridge Standard Drawings.

Slotted wells in prestressed girders shall be located and shown on plans as between reinforcement bars or WWF.

Use bevel plate at end bents only when the grade of the slab is 3.0% or more. Modify the roadway plate, the 5/8 in. vertical plate and the continuous bar when the bevel plate is required.

751.13.5.2 Plan of Beam at Bearings

Image:751.13 Flat Plate Expansion Joint- Plan of Beam at Bearings- Part Plan Backwall.gifImage:751.13 Flat Plate Expansion Joint- Plan of Beam at Bearings-Notes.gif
PART PLAN AT BACK WALL 
Image:751.13 Flat Plate Expansion Joint- Plan of Beam at Bearings-Detail A.gif
TABLE FOR "R" - WIDE FLANGE BEAMS
Nominal
Flange
Width (*)
8 ¼"9"10"10 ½"11 ½"12"
"R"0.54"0.54"0.64"0.70"0.75"0.80"
DETAIL "A"
(TYPICAL)
(*) Note: For wide flange beams with flange widths other than those shown refer to AISC Steel Construction Manual for "R".
Image:751.13 Flat Plate Expansion Joint- Plan of Beam at Bearings-Intermediate Bents.gifImage:751.13 Flat Plate Expansion Joint- Plan of Beam at Bearings- End Bents.gif
STRINGER OR GIRDER
INTERMEDIATE BENTS
STRINGER OR GIRDER
WITH BEARING AT
END BENTS

(*) Note: Details for a steel structure shown, details for a prestressed structure similar.

751.13.5.3 Miscellaneous Details

Image:751.13 Flat Plate Expansion Joint- Miscellaneous- Sidewalk.gif


TYPICAL SIDEWALK DETAILS


Image:751.13 Flat Plate Expansion Joint- Miscellaneous- Median.gif


TYPICAL MEDIAN DETAILS


Image:751.13 Flat Plate Expansion Joint- Miscellaneous- Part Section A-A.gif


PART SECTION A-A

751.13.5.4 Flat Plate Expansion Devices - Details

Bridge Standard Drawings
Flat Plate Expansion Devices

751.13.6 Finger Plate Expansion Devices

751.13.6.1 General

The max. roadway surface gap (W) shall meet the following criteria:

When W(Long.) < 8", Then W(Tran.) < 3".

OR

When W(Long.) > 8", Then W(Tran.) < 2".


Image:751.13 Finger Plate Expansion Joint- General.gif

The min. finger overlap = 1.5"


Expansion lengths are calculated from the total movement value by the following equation:


Expansion length = \, \frac{Movement}{1.2 \left(\alpha \right) \left (T \right)}


Where:

Max. Length of Expansion, ft. (1)Total Movement, inches Gap at 60° F, inches
Concrete Steel
38528442 3/4
578 4276 3 1/2
1 Longer expansion lengths are possible but they must be designed.

For Concrete:

\, \alpha = 0.000006 ft/ft/˚F

\, T = 120˚F

For Steel:

\, \alpha = 0.0000065 ft/ft/˚F

\,T = 150˚F

751.13.6.2 Details at Bents

Details of Fingers

Details at End Bent

Dimensions shown are perpendicular to centerline of joint and do not vary with skew (Unless otherwise noted).

Image:751.13 Finger Plate Expansion Joint- End Bent- Part Section Thru Expansion Device- Steel.gif


PART SECTION THRU EXPANSION DEVICE
(Steel Structure)


Image:751.13 Finger Plate Expansion Joint- End Bent- Notes.gifImage:751.13 Finger Plate Expansion Joint- End Bent- Detail A.gif
 DETAIL "A"

Image:751.13 Finger Plate Expansion Joint- End Bent- Part Section Thru Expansion Device- Prestress.gif

PART SECTION THRU EXPANSION DEVICE
(Prestress Structure)


(*) Dimension along centerline of girder.

(**) When distance "A" or "D" shown in EPG 751.13.6.3 Typical Plan of Plate is greater than 9" or 12", respectively, then the details of supporting angles, mounting plates, shear studs and finger plate thickness need to be specially designed. Mounting Plates shall not be less than supporting angle in thickness.


Details at Intermediate Bent

Dimensions shown are perpendicular to centerline of joint and do not vary with skew (Unless otherwise noted).

Image:751.13 Finger Plate Expansion Joint- Int Bent- Part Section Thru Expansion Device- Steel.gif

PART SECTION THRU EXPANSION DEVICE
(Steel Structure)

Note: For Detail "A", see above.


Image:751.13 Finger Plate Expansion Joint- Int Bent- Notes.gif


Image:751.13 Finger Plate Expansion Joint- Int Bent- Part Section Thru Expansion Device- Prestress.gif

PART SECTION THRU EXPANSION DEVICE
(Prestressed Structure)


(*) Dimension along centerline of Girder.

(**) When distance "A" or "D" shown in EPG 751.13.6.3 Typical Plan of Plate is greater than 9" or 12", respectively, then the details of supporting angles, mounting plates, shear studs and finger plate thickness need to be specially designed. Mounting Plates shall not be less than supporting angle in thickness.


Image:751.13 Finger Plate Expansion Joint- Int Bent- Part Section Thru Expansion Device- Prestress to Steel.gif

Image:751.13 Finger Plate Expansion Joint- Int Bent- Part Section Thru Expansion Device- Prestress to Steel Notes.gif

Dimensions shown are perpendicular to centerline of joint and do not vary with skew (Unless otherwise noted).

(*) Dimension along centerline of Girder.

(**) When distance "A" or "D" shown is greater than 9" or 12", respectively, then the details of supporting angles, mounting plates, shear studs and finger plate thickness need to be specially designed. Mounting Plates shall not be less than supporting angle in thickness.


Details of W24 Piece

Image:751.13 Finger Plate Expansion Joint- Int Bent- W24 Piece- Plan.gif


PLAN


Image:751.13 Finger Plate Expansion Joint- Int Bent- W24 Piece- Elev.gif


ELEVATION OF PIECE W24 X 76 (SQUARED)
104 (SKEWED)

Note:

Place the above details near "Part Section Thru Expansion Joint System For Finger Plates".

All holes shown for connections to be subpunched 11/16" Ø (shop or field drill) and reamed to 13/16" Ø in field.

751.13.6.3 Typical Plan of Plate

Squared Devices
A = 7.5" for 4" movement
A = 9.5" for 6" movement
C = A - 0.5" + Gap @ 60° F



Skewed Devices
4" MOVEMENT
θAB
1° - 13°7 1/2"2 1/8"
14° - 19°7 1/2"2 3/16"
20° - 37°7 1/2"2 1/4"
38° - 46°7"2 5/16"
47° - 53°6 1/2"2 3/8"
54° - 58°6"2 7/16"
59° - 60°5 1/2"2 7/16"
6" MOVEMENT
θAB
1° - 16°9 1/2" 2 1/16"
17° - 29°9 1/2"2 1/8"
30° - 39°9"2 3/16"
40° - 48°8 1/2"2 1/4"
49° - 54°7 1/2"2 5/16"
55° - 60°7"2 3/8"
θ = skew angle
C = (A - 0.5") + (Gap @ 60°F) cos θ
D = (A- 0.5") sec θ
E = 4" - B

751.13.6.4 Slab Details

The slab extension beyond the edge of the supporting member shall be shown on the plan of slab.


Additional slab bars shall be located in the slab extensions.

Dimension F
(Standard Details)
 
Structure End Bent Intermediate Bent
Squared
Bents
Concrete A 0.25" + A/2
Steel3.845" + A 4.095" + A/2
Skewed
Bents
Concrete(A)secθ(0.25" + A/2)secθ
Steel(3.845" + A)secθ(4.0925" + A/2)secθ

Where:

θ = skew angle
A = length of individual finder (previous section)
3.845" = \frac{(b_f - t_w)}{2} and 4.095" = \frac{(b_f - t_w)}{2} + 0.25"
bf = 7.995", tw = 0.305" (W14x43)
0.25" = 0.5" plate overhang divided by two
(The other overhang is included in Dimension A.)

On the plans the dimensions of the slab extension and the additional slab bars shall be specified on the plan of slab sheet where a special detail similar to the above detail may be used.

751.13.6.5 Barrier Curb Details

The R5 bar shall be used in the slab extension where there is insufficient clearance for the typical R4 bar.


The R5 bars shall be specified on the elevation of barrier sheet in a section detail.

Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Part Elev at End Bent.gifImage:751.13 Finger Plate Expansion Joint- Barrier Curb- Part Section AA.gif
PART ELEVATION OF BARRIER CURB
(END BENT)
TYPICAL PART SECTION A-A
Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Bent Plate Part Elevation.gifImage:751.13 Finger Plate Expansion Joint- Barrier Curb- Bent Plate Section CC.gif
PART ELEVATION AT
END OF BEVELED CURB
BENT PLATE
SECTION C-C
Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Part Elev at Int Bent.gifImage:751.13 Finger Plate Expansion Joint- Barrier Curb- Part Section BB.gif
PART ELEVATION OF BARRIER CURB
(INTERMEDIATE BENT)
TYPICAL PART SECTION B-B


Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Plan of Curb at End Bent- Square.gif


PART PLAN OF CURB AT END BENT (SQUARE)


Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Plan of Curb at End Bent- Skewed.gif


PART PLAN OF CURB AT END BENT (SKEWED)


Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Plan of Curb at Int Bent- Square.gif


PART PLAN OF CURB AT INTERMEDIATE BENT (SQUARE)


Image:751.13 Finger Plate Expansion Joint- Barrier Curb- Plan of Curb at Int Bent- Skewed.gif


PART PLAN OF CURB AT INTERMEDIATE BENT (SKEWED)

751.13.6.6 Median Barrier Curb Details

For the details not shown of median barrier bridge curb, see the safety barrier curb details. The Design Division Standard Plans (Concrete median barrier ), and the Bridge Design Layout.

Image:751.13 Finger Plate Expansion Joint- Median Barrier Curb- Part Section A-A.gifImage:751.13 Finger Plate Expansion Joint- Median Barrier Curb- Part Section B-B.gif
TYPICAL PART SECTION A-ATYPICAL PART SECTION B-B
Image:751.13 Finger Plate Expansion Joint- Median Barrier Curb- Part Elev Barrier Curb.gif
Image:751.13 Finger Plate Expansion Joint- Median Barrier Curb- Elev at Beveled Curb Bent Plate.gif
PART ELEVATION AT END
OF BEVELED CURB BENT PLATE
Image:751.13 Finger Plate Expansion Joint- Median Barrier Curb- Elev at Beveled Curb Bent Plate- Section C-C.gif
SECTION C-C
PART ELEVATION OF BARRIER CURB
(INTERMEDIATE BENT)
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