Bridge Deck Overhang Design Example. xlsx Example 7 ENGINEERING BRIDGE DECK FORMING DESIGN CALCULATION

xlsx Example 7 ENGINEERING BRIDGE DECK FORMING DESIGN CALCULATIONS AND DRAWINGS Dayton Superior has Engineers that specialize in the layout, design, and spacing of bridge deck overhang The conventional, overhang bracket system referred to in this article is the system of bridge deck overhang brackets and embedded hangers, as shown in Fig. Dead and Live loads. Design Case 3 is for Strength I Limit State under gravity live loads and is Only applicable for short bridge lengths (< 30 ft) Punching shear failure (27ft specimens) Punching controls prior to forming barrier mechanism (110 kips vs 150 kips) Consistent with actual failures Development of a Comprehensive Design Example for a Steel Girder Bridge with Commentary Example 4 - Type II Bearing (Reinforced Bearing with PTFE) (B). 4 kips and a corresponding Mc = 17. 1 kip-ft/ft, which is well At the completion of the testing of the currently available systems for overhang forming, a new concept was developed to use a precast overhang as an alternate solution to create the finished bridge deck Quality Assurance Statement The Federal Highway Administration provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. When an errant vehicle strikes a bridge railing on a typical girder bridge, impact loads are transmitted downward through the railing and inward through the deck overhang to the primary LRFD Design Examples NHI Course 130081 - Load Resistance Factor Design (LRFD) for Highway Bridge Superstructures, Design Examples (PDF, 7. For the equivalent strip method analysis, the girders act as supports, and the deck acts as a simple or continuous beam Although not explicitly stated in the above three design cases, the design of the bridge deck overhang should also consider serviceability requirements with regard to crack control and minimum steel Bridge deck overhangs is designed to satifsay the following three different design cases. 1, that support the deck forms, screed 9. For Design Case 1 (Extreme Event Limit State), the overhang must be designed for the vehicular Additionally, the bridge barriers (or railings) must be designed to withstand a predetermined level of crashworthiness, typically specified by the bridge owner or governing agency. Vertical vehicular collision force. Wheel Load C49 Bridge Overhang Bracket C60 . The deck and soffit design tables in Background Bridge live loads and truck volume have been continuously increasing since 1960’s Truck loads and wheel configurations for bridge deck design no longer reflect the modern trucks, let alone Finally, a design example for a reinforced concrete bridge deck is provided. xlsx Example 5 - Expansion Device (Strip Seal) (0 to 4 in) 2025. The deck and soffit design tables in this BDM provide When an errant vehicle strikes a bridge railing on a typical girder bridge, impact loads are transmitted downward through the railing and inward through the deck overhang to the primary For the first deck bay, the bay adjacent to the overhang, the location of the maximum design positive moment varies depending on the overhang length and the value and distribution of the dead load. 8 mb) 9. 1 SCOPE This Section contains guidelines to supplement provisions of Section 9 of the AASHTO LRFD Bridge Design Specifications for the design of bridge decks and deck systems of reinforced For uniformity and simplicity, this design example is based on the AASHTO LRFD Bridge Design Specifications (Seventh Edition, 2014), including the 2015 Interim Specifications. 3. 4. In this example, the equivalent strip method will be used. Horisontal vehicular collision force. For example, the interior panel of a TL-4, 36 inch Type S barrier on a deck with a wearing course has a capacity Rw = 117. 2. The deck overhang design examples are based on the work of this To illustrate the potential benefits of a precast concrete deck overhang system, the advantages and disadvantages of the precast concrete solution and the conventional cast-in-place deck approach Design of deck reinforcement, including flexural resistance, limits of reinforcement, and control of cracking is based on AASHTO LRFD Bridge Design Specifications 5. xlsx Example 6 - Deck Design 2025. This document This BDM addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings described in STP 9. 1. 3 (typical rectangular beam What is the appropriate design procedure? This BDM addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings as described in STP 9. The example illustrates bridge deck design in accordance with the AASHTO LRFD Bridge Design Specifications (AASHTO, I'm currently designing a deck overhang with a TL-4 barrier using AASHTO LRFD. Example 40" Deep Plate Girder with 1" Thick Flanges 8 Wheel Screed Machine 3'-0" Overhang D1 = 1'-6" 8" Thick Overhang Slab (157 PSF) W1 = 650 lbs. 7. Design Case 2 represents the limit state after a collision in which it is assumed that a collided truck is resting on top of the barrier. The deck and soffit design tables in this BDM provide N D I X Design Examples This appendix presents three design examples for railings and two design examples for deck overhangs. 1 GENERAL This BDM addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings as described in STP 9.

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