Deck Overhang Design Example. See Figure 5 for an example of a typical deck framing plan.

See Figure 5 for an example of a typical deck framing plan. The area of top transverse reinforcing provided in Table 9-1 and Table 9-2 in Section 9. 1 - Obtain Design Criteria This pier design example is based on AASHTO LRFD Bridge Design Specifications (through 2002 interims). If through experience and use, the user discovers additional or alternative procedures that may seem superior to those shown in Approved crash tested concrete bridge railing reinforcement details for the barrier and deck reinforcement may be used for the deck overhang design, if the design fits the crash tested variables. 2. 4 of the AASHTO LRFD (7th Edition, 2014 Preface The Structure Construction Bridge Deck Construction Manual is intended to serve as a guide and a reference source for Bridge Engineers and others involved in field engineering and inspection of bridge decks under construction. The effective length for monolithic cast-in-place concrete is the clear distance between supports. […] The values in the following table shall be used for the design of the deck overhang in conjunction with ADOT Bridge Group Standard Drawings (SD) for concrete barriers. The deck overhang is evaluated for two load cases under the extreme event limit state, with vehicular collision forces, CT, taken as: Design Case 1: transverse and longitudinal forces specified in Article 13. This bdm addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings as described in stp 9. Discover different types of roof overhangs and their designs. In the analysis, each girder supports its own weight, and the fluid weight of the deck. Florida Department of Transportation Structures Design Guidelines, January 2011 9. 2-1. 1. Example 4 - Type II Bearing (Reinforced Bearing with PTFE) (B). Get inspired with design ideas from pergolas to arbors and more. Maximum allowable overhang cannot exceed L/4 or 1⁄4 of actual main span. 1 GENERAL This BDM addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings described in STP 9. 1'-8 1/4" 1'-10" Sep 3, 2020 · Includes project specific design criteria (such as span configuration, girder configuration, initial spacing of cross frames, material properties, and deck slab design) and design criteria from AASHTO (such as load factors, resistance factors, and multiple presence factors). 1, that support the deck forms, screed rail, and walkway. Concrete Deck design - Flexure in Overhang Bridge deck overhangs is designed to satifsay the following three different design cases. Jun 27, 2017 · Determine Minimum Overhang Thickness S13. Bridge Deck Overhang Design Example. 4 may be counted toward the area of steel required to resist moments caused by all overhang loads (see Deck Design Example 6). In the first design case, the overhang must be designed for horizontal (transverse and longitudinal) vehicular collision forces. xlsx Example 7 Camber and Haunching_20180101. The document summarizes new guidance from MnDOT on deck overhang design for bridges. However, the deck overhang design must also consider a vehicular collision load with the railing system at the extreme event limit state. Jun 27, 2017 · Bridge deck overhangs must be designed to satisfy three different design cases. Dec 15, 2022 · Building a cantilever deck is a perfect way to add outdoor living space to your home. Misuse or lack of supervision and/or inspection can contribute to accidents resulting in property damage, serious personal injury or deaths. The new practice specifies matching the edge of deck thickness to the deck thickness and sloping the deck surface to the gutterline elevation. Apr 20, 2023 · How much should decking overhang the edge of the deck? Decking should overhang the deck’s substructure ¼” to 1 ¾”, matching the stair nosing overhang. The cantilever portion of the deck slab (deck overhang) must be designed for dead and live load moments for the strength and service limit states, where the moments are based on traditional beam theory. Discover the perfect design, materials, and architectural styles with these patio cover ideas. How to complete a simple example for a reinforced concrete deck slab design. 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 overhang construction. California Department of Transportation | Caltrans Learn how to build many different types of decks in our Framing & Construction hub. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. . xlsx Example 6 - Deck Design 2025. 3] ADOT Bridge Practice Guidelines specify that deck design be based on the effective length rather than the centerline-to-centerline distance specified in the LRFD Specification. Resources and alternate examples available to designers and engineers. You have searched for Deck Overhang and this page displays the best picture matches we have for Deck Overhang in October 2025. My place, and those around me, are beautifully designed but there are not many examples of When it comes to your home’s architecture, roof overhangs play a significant role in both functionality and aesthetics. Mar 3, 2024 · Discover how to maximize the benefits of a roof overhang with our design tips and ideas. Standards The example utilizes the following design standards: Florida Department of Transportation Standard Specifications for Road and Bridge Construction (2010 edition) and applicable modifications. Get expert advice on building codes and designs. The overhang region is then designed for vehicular collision with the railing system and for dead and live loads acting on the deck. Outrigger framing, using outlookers, is recommended for overhangs greater than 12 inches deep. Attach fascia board at the edge of the overhang. Part two provides typical practice for design including transverse and longitudinal design along with design examples. 2 is adequate for interior region deck overhangs (measured from centerline of beam to edge of deck) of up to 40% of the beam spacing when a 36 inch tall Type S concrete barrier which meets NCHRP Report 350 Test Level 4 (TL-4) is used. Apr 12, 2024 · Discover 17 simple overhang roof ideas that add style, shade, and protection to your home while improving energy efficiency and curb appeal. For application of the uniform 20 psf live load, the total area supported includes the area of construction walkways that extend beyond the outside edge of the deck or the deck overhang. Article A13. Sep 14, 2023 · These covered deck ideas will give your backyard a makeover while creating more shade and outdoor entertaining space. 4. Feb 24, 2020 · I'm designing a deck overhang for barrier impact load in Washington State. Porch Overhang – Search Results in Home Design You have searched for Porch Overhang and this page displays the best picture matches we have for Porch Overhang in December 2025. The structure and design of your home (and individual creativity) will influence your patio cover design and make it distinctive and unique. Download your free deck plans to start building today. Use the remaining details to guide you in determining the other design elements of your deck. Nov 5, 2025 · What are Cantilever Decks? A cantilever deck, which is also called a floating deck or projecting deck, has beams that go past the place where they are supposed to be supported. Additionally, we are able to provide bridge deck accessory take-offs and detailed drawings for end users of Dayton Superior bridge deck products. This chapter provides Sep 27, 2021 · LRFD Design Examples NHI Course 130081 - Load Resistance Factor Design (LRFD) for Highway Bridge Superstructures, Design Examples (PDF, 7. Oct 13, 2025 · This guide provides design ideas, material options, construction techniques, code considerations, and maintenance tips to help homeowners create a durable, attractive, and functional overhang-roof deck. overhangs allowed on either side of the beam, the joist length can total more than 20 ft. Dayton Superior has Engineers that specialize in the layout, design, and spacing of bridge deck overhang brackets and hangers when needed on your next project. The proposed system involving a precast concrete deck overhang solution, also shown in Fig. ErIc Rorer Example of a trendy backyard deck design in San Francisco with a fire pit and a pergola May 14, 2012 · This investigation addresses the LRFD and Standard design methodologies of concrete deck slab, deck overhang, barrier and combined barrier-bridge overhang. 3. For example, using DCA 6, 2×10 southern-pine joists at 16 in. Cantilever decks are an excellent way to expand deck space. The design methods presented throughout the example are meant to be the most widely used in general bridge engineering UMD May 2, 2023 · A covered deck allows you to enjoy your outdoor space with shade and protection from rain. Physical test Bridge Deck Overhang Details In the past contractors could set the form for the bottom of the overhang even with the bottom of the top flange of the exterior steel girder and slope it up to the proposed elevation at the outside edge of the overhang. Discover recipes, home ideas, style inspiration and other ideas to try. A design example of a reinforced concrete bridge deck is included, illustrating essential calculations and practical guidelines for ensuring structural integrity and performance. Mar 6, 2025 · Learn about cantilever decks, the benefits, and the rules for overhangs. 4 The overhang or extended length can exist on one side in the case of a single overhanging beam or on both sides in the case of a double overhanging beam, depending on the design and function of the structure it is part of. It outlines how to calculate the design moment considering both live and dead loads. Dec 11, 2025 · If you need shade for your yard, consider a covered patio. Explore a wide variety of trendy deck designs and discover new ideas for layouts, material and decor. This ensures that the deck will be stronger than the rail and that the yield line failure mechanism will occur in the parapet. Design Preliminaries . 5-in. For this example, the Approximate Method (Strip Width Method) is used. Patio Cover Plans provides information on how to build a patio cover or deck cover. Jun 27, 2017 · Design Step 8. Bridge deck overhang design 2/7/2018 18 recommendations •design overhang for vertical loads (case 2 and 3) •if lateral force considered:. AASHTO LRFD Bridge Design Specifications, 5th Edition, 2010. Browse pictures of contemporary decks. Design Case 1 is evaluated at Design Region A-A, which is a plane coincident with the traffic-side vertical steel, and Design This module provides practical information regarding the decking options and design considerations for steel bridges, presenting deck types such as concrete deck slabs, metal grid decks, orthotropic steel decks, wood decks, and several others. Jul 31, 2024 · Adding deck patterns to your deck design can add a splash of style. Download scientific diagram | Typical overhang formwork schematic (left) and in-field example (right) from publication: Investigation of Exterior Girder Rotation and the Effect of Skew during Deck Look through deck pictures in different colors and styles and when you find a deck with a roof extension design that inspires you, save it to an Ideabook or contact the Pro who made it happen to see what kind of design ideas they have for your home. 1 and 9. 12 - Final Pier Schematic Design Step 8. 2 specifies that the vehicle collision force to be used in deck overhang design is to be equal to the rail capacity R w . 7. Guidance is also given on the acoustic performance of typical composite slabs. Enhance the look and functionality of your home. pdf), Text File (. 1, is described in detail in this article. In this research effort, design demands for deck overhangs supporting concrete railings were characterized using physical testing and complementary modeling in LS-DYNA. 8 mb) Overhang - Free download as PDF File (. xlsx Example 5 - Expansion Device (Strip Seal) (0 to 4 in) 2025. A structure known as the soffit is what can be found beneath an overhang. Complete Overhang Guide. As this manual is intended solely as guidance material, contract documents should always prevail in case of conflicts. However, the design load for all falsework supporting the walkway is the greater of the actual vertical load, or the minimum total design load of 100 psf, as discussed in the following section. Although overhangs on slate roofs are typically longer than those on other roofs, almost all buildings have some roof overhang. 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. It then provides an example calculation for required reinforcing steel based on the design moment and other parameters. 11 - Design Pier Footing Design Step 8. Feb 21, 2023 · Need covered deck inspiration? There's 19 great deck design ideas and tips on best decking materials to use. Design Concepts For A Deck With Overhang Roof Overhang roofs come in several configurations, each influencing style, drainage, and wind resistance. Jun 13, 2022 · Pergola Overhang Cantilever Roof Overhang Bonnet Overhang Curved Overhang Gambrel Overhang Hexagonal Overhang Mansard Overhang I never gave much thought to roof overhangs until recently. Houzz has millions of beautiful photos from the world’s top designers, giving you the best design ideas for your dream remodel or simple room refresh. In this homeowner’s guide, we’ll explore 11 key types of roof overhangs, their purposes, and the benefits they offer. Simple search Deck replacement is impractical and almost impossible to do without closing the entire bridge. 4 Typical Deck, Typical Overhang, and Soffit Design. Enhance the aesthetics and functionality of your roof. But it also has a section about calculating the forces based off of the railpost capacity (but it also says Jun 17, 2024 · Looking for unique porch overhang and roof ideas? Click here. Dec 4, 2023 · 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 superstructure elements. Longitudinal forces are not discussed in this example. The document discusses the design of deck overhangs according to AASHTO standards. May 29, 2020 · Hello, I'm unsure of how to interpret the design forces for the bridge deck overhang. Jun 27, 2017 · The overhang region is then designed for vehicular collision with the railing system and for dead and live loads acting on the deck. In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed. xlsx Example 9 - Seismic Zone 1 Design_20190101. With 3-ft. Sep 25, 2018 · The transverse reinforcement given in Tables 9. This practice lead to a variable depth overhang and is no longer allowed. Overhanging decking is not the only option with your decking. Administration. But there are a few things you need to know about cantilever framing and overhang rules before you get started. The deck overhang is designed to resist an axial tension force and moment from vehicular collision (CT) acting simultaneously with the Dead Load (DC/DW) and Live Load (LL) moment. Assumes cantilever length/180 deflection with 220 lb point load (See Figure 1A and Figure 2). The deck and soffit design tables in this BDM provide the minimum allowable section thicknesses and reinforcement for a given girder spacing. May 28, 2024 · Explore the functional and aesthetic benefits of overhang roof design ideas that can transform your residential or commercial property. between beam faces. xlsx 16. Feb 22, 2023 · From pergolas to slatted roofs, discover 25 patio cover ideas that will help you stay cool in the shade and hang outside all day long. The checker has indicated that the rebar we're using (#5 @ 6") has insufficient development length for the critical section at the barrier LRFD A13. Free-standing deck joists can also cantilever beyond drop beams at each end, extending the reach of a joist. The state standard details have the barrier face 10. FHWA periodically reviews quality issues and adjusts its programs and processes Discover recipes, home ideas, style inspiration and other ideas to try. The design is based on classic cantilever engineering principles. For this example with a centerline-to-centerline web spacing of 42. At the inside face of the barrier the deck overhang design forces per foot not including dead loads may be taken as: Where: LC critical length of yield line This BDM addresses the design of typical bridge decks, typical overhangs, and soffits for new bridges and bridge widenings as described in STP 9. Loads placed on the bridge after the deck has been placed are assumed to be resisted by the composite girders that span continuously across the interior supports. 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. Safety Dayton Superior Bridge Deck forming accessories are intended only for use by trained, qualified and experienced workers. ) are only an example. Their extended 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. We have hundreds of professional deck plans for pool decks, multi-level decks, porches and more. Oct 26, 2021 · Discover covered deck ideas like simple awnings, elegant pergolas, and full roof extensions to find the right option for your space. Concrete failure rather than reinforcement anchorage in overhang 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 Deck Overhang Ideas: Cozy seating, lighting, and nature-inspired designs for your outdoor space. I live in a conventional brownstone in the middle of a major city. Apr 1, 2013 · I'm currently designing a deck overhang with a TL-4 barrier using AASHTO LRFD. We’re sharing ideas for pergolas, roofs, and screens. Specifics include design thickness, transverse and longitudinal reinforcement, overhang design, impact to barrier, panel-to-girder connection, and longitudinal post-tensioning. 8. 3 Commentary for 3: The deck overhang region is required to be designated to have a resistance larger than the actual resistance of the parapet. Use our builder resources to find materials and start building today. It provides examples of when standard design assumptions from MnDOT tables can be 9. They not only protect your house from the elements but also add character and style to your property. For Design Case 1, the deck overhang supporting concrete parapet railings shall be designed to resist the combined effects of tensile force T and moment Ms, and other applicable forces at the inside face of the parapet or the gutter line, as specified as follows. 4 DECK, OVERHANG, AND SOFFIT DESIGN 9. Design Case 3 is for Strength I Limit State under gravity live loads and is covered in Bridge Design Memo (BDM) 9. The intent of these examples is to assist bridge designers in interpreting the specifications, limit differences in interpretation between designers, and to guide the designers through Selected code provisions to consider when designing a deck or a deck system. The Empirical Design Method requires less reinforcement in the interior portions of the deck than the Approximate Method. 50 inches and web width of Mar 23, 2024 · Types of roof overhangs such as shed, flat, awnings, pergola, gambrel, with parts, costs and the best roof overhang designs for your home. Jan 15, 2025 · The distance between the house’s siding and the roof determines how much of an overhang there is on the roof. 2 DESIGN CASE 1 The deck overhang must be designed for the load combination of Extreme Event II limit state without including the effects of the longitudinal design force, FL, from AASHTO LRFD Table A13. Learn how to install a roof overhang and explore the benefits they offer. Effective Length [9. Deck framing cantilever: As in other decks, Cantilever decks are built by attaching the deck joists to the house framing with hangers. For this steel girder design example, a plate girder will be designed for an HL-93 live load. This creates a cantilevered section without vertical posts for support. The design example walks through the design of a modest 300 ft x 504 ft warehouse structure starting with basic fire life-safety and continuing through the structural design of the steel roof deck and open web steel joists and girders. Does that Jun 3, 2025 · Roof Overhangs also known as Patio Covers, Deck Overhangs or Covered Outdoor living spaces are the best way to upgrade your home. Jun 27, 2017 · The steel girder design criteria are obtained from Figures 3-1 through 3-3 (shown below), from the concrete deck design example, and from the referenced articles and tables in the AASHTO LRFD Bridge Design Specifications (through 2002 interims). For Design Case 1 (Extreme Event Limit State), the overhang must be designed for the vehicular collision plus dead load moment acting concurrently with the axial tension from verhicular collision force. The dimensions indicated in these drawings of the existing structure (size and elevation of the slab, roof overhang, etc. Learn layout options, such as chevron & deck inlays, to consider when planning your deck. Ladder framing and outrigger framing are the two most common methods. Subjected to static and dynamic loads, thermal gradients, and creep and shrinkage effects. 4 to provide a flexural resistance MS, acting coincident with the tensile force T. Ensure you record your deck design on Page 27. Overhanging deck boards improve the appearance of the deck, and hide little imperfections while protecting the substructure. All low maintenance, strong, and beautiful. 1 GENERAL This policy addresses the design of concrete bridge decks, deck overhangs, and soffits for new bridges and bridge widenings. Install gable roof overhang framing with correct lumber dimensions using adequate connections. DECK FRAMING PLAN A framing plan shows the joist and beam layout; the location of the ledger board, posts, and footings, and the type, size, and spacing of the ledger board fasteners. Therefore, it is always a good strategy to be conservative and allow for reserved capacity during design. It outlines the old practice, reasons for changes to provide consistency and clarity. 2 Design Step 2. xlsx Example 8 - Wing Wall Design 2021. on center have an allowable span of 14 ft. In the first design case, the overhang must be. The deck overhang should be designed in accordance to the requirements of the AASHTO-LRFD article A13. Oct 7, 2025 · Make your deck the centerpiece of your outdoor entertaining with these covered deck ideas. The force effects on the deck overhang due to the rail collision force, Ft, as shown in Figure 1 must be taken as the combined transverse tensile force T and transverse moment Mct as Mar 13, 2019 · Want a covered deck or partially covered deck? Check out our amazing photo gallery featuring 51 amazing and diverse covered deck options. The design specifications used in these examples is the AASHTO LRFD Bridge design Specifications. txt) or read online for free. Once you have selected the size of your deck, use the joist and beam span tables to determine their size, spacing, span lengths and overhang dimensions. It says to design for the transverse or vertical forces from the impact table (Design Cases 1 and 2). 5" from the edge of deck. We've rounded up 30 of our all-time favorite designs to inspire your next build.

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