1. Deck: Reinforced 7-1/2-inch-thick concrete deck, as detailed in Attachment A. The concrete for the slab shall be Class S with minimum 28-day compressive strength of 4,000 PSI. The reinforcing steel shall be grade 40. Testing shall be provided by the contractor. The deck should be secured to the beams with stud connectors at 4-foot centers, as detailed in Attachment B, for compression flange bracing, and to ensure that the deck does not shift laterally. In lieu of studs, 7-inch channel-section connectors may be used. 2. Beams: Wide flange W 36 x 130 Beams at 5-foot centers. The beams should be interconnected with end diaphragms over each abutment and with interior diaphragms at the mid-span, as shown in Attachment B. However, the interior diaphragm detail should be moved up as close to the place of the compression (top) flange as practical (clear the radius) to provide additional torsional bracing. Also, the vertical stiffeners should be extended to attach to the top flange. Bridge Building and Reconstruction 3. Header Walls: Header walls will be constructed of ¼-inch plate welded to the outside of the 24-foot abutment and extended at least 10 feet at 45-degree angles to the approach roadway. The side slope shall be 3:1, and 2:1 slope underneath the bridge. The abutment and header walls shall be backfilled with 2- sack flowable concrete that conforms to TXDOT specification Item 401. Flowable Backfill. 4. Metal Beam Guard Fence (MBGF): Metal Beam Guard Fence shall be installed in accordance with the associated TXDOT standard sheets.
