FDOT Standard Plans Index 458-110: Expansion Joint System - Poured Joint with Backer Rod

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG )

Design Assumptions and Limitations

Design Assumptions and Limitations Use Index 458 - 1 1 0 in accordance with the requirements of SDG 6.3 and 6.4.

Payment

Payment Item number Item Description Unit Measure 458 - 1 - 11 Bridge Deck Expansion Joint , New Construction, F&I Poured Joint with Backer Rod LF Example Given a bridge on a 45° skew, find Dimension A at 70° F. Note: contraction and expansion are in the direction of movement and Dimension A is measured perpendicular to the joint opening. The maximum allowable opening in the direction of travel is 3 inches (See SDG Table 6.4 - 1).

The calculated movement is ±1 inch. The minimum opening at 70° F in the direction of movement/travel is 2 * 1" = 2". Two inches in the direction of movement = 1.4" (Say approximately 1.5" perpendicular to the joint).

Contraction/expansion perpendicular to the joint would be approximately 0.7" (Say 0.75" for simplicity). Check if a Dim A of 1.5" meets the criteria. Dim A ≥ 2 * contraction: 2 * 0.7 =1.4 < 1.5" OK Maximum opening in the direction of travel is < 3": Converting back from perpendicular to direction of movement: Opening = 2.12 inches at 70° F, therefore the maximum opening = 2.12" + 1" = 3.12".

3.12" is within a reasonable construction tolerance of 3", therefore OK. Use Dim A = 1½". Standard Plan s Instructions Topic No.

625 - 010 - 003 Index 458 - 110 Expansion Joint System - Poured Joint with Backer Rod

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• Show Poured Joint with Backer Rod Expansion Joints on Superstructure and Approach Slab detail sheets and other sheets as required. Label Expansion Joint by name or Index number. Show Sidewalk Cover Plates at all expansion joint locations that intersect wit h sidewalks. Complete the "Poured Expansion Joint Data Table Index 458
• - 110" using the instructions provided and include the table in the plans. See FDM 115 for more information regarding use of Data Tables. Instructions:
• 1. Total Design Movement is the absolute value of the total factored temperature movement (expansion and contraction), measured in the direction of movement. Note that creep and shrinkage may be neglected. See Standard Plan s Instructions for Index 458
• - 100, Figures 1 through 4, for determining the Direction of Movement.
• 2. Include a value for Dimension A in the Data Table. Dimension A (measured perpendicular to the joint @ 70°F) is normally set at 2 inches for non
• - skewed joints. Set Dimension A to account for skews or smaller design movements while meeting the design limitat ions below:
• a. The design joint opening should be equal or greater than twice the factored joint contraction
• b. The minimum factored joint opening in the direction of movement is ½ inch;
• c. The maximum factored joint opening in the direction of travel is 3 inches;
• d. The minimum joint opening recommended by manufacturers at the time of installation is 1 inch.
• 3. Dimension A adjustments for 10°F shall be based on the unfactored movements perpendicular to the centerline of the joint.
• Standard Plan s Instructions Topic No. 625
• - 110 Expansion Joint System
• - Poured Joint with Backer Rod