The program performs the analysis, design, andor rating of wood bridge superstructures in. Section 3 specifies loads for bridge decks, section 4 specifies their analyses, and section 9 specifies the resistance of bridge decks. Analysis, design, rating, and drafting of wood bridge superstructures w. Design, construction, inspection, and maintenance, u. Besides drawing the basic design, also add some of the.
Click onto the tutorial or example in the table below to connect to the relevant web page. Title live load distribution factors for a three span continuous precast girder bridge publication no. Kansas department of transportation design manual volume iii us lfd bridge section version 109 5 1 1 5. Bridge deck drainage roadway and bridge deck profiles shall be adjusted as much as possible to avoid having bridge drains on the bridge. This design example was edited in 2012 by hdr engineering, inc. The first design step for a concrete bridge deck is to choose the correct design criteria. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 42 dead and live loads acting on the deck. For longitudinal beam bridges, two conditions are checked in the transverse direction to design the deck reinforcing steel. The bridge deck drain spreadsheet may be used to assist the designer in locating deck drains. This will pull down a dropdown menu of versions of powerdraft to download. A sample analytical method for bearing resistance calculation.
The following design method can be used for normal weight concrete with specified. A load factor rating example is shown in this subsection. Structures design office lrfd design examples files pdfs fdot. The following concrete deck design criteria are obtained from the typical superstructure cross section shown in figure 21 and from the referenced articles and tables in the aashto lrfd bridge design specifications through 2002 interims. Youve heard the expression measure twice, cut once. The bridge deck is not designed to carry the vehicular loads. An example of a haunched girder ladder deck is shown in figure 2. Bss010119992 abstract this design example illustrates the procedure for calculating live load distribution factors for the approximate method of analysis described in article 4. As designers, ethics play a role in our responsibility to abide by all.
Tutorials on bridge design and assessment with examples. If bridge geometry is such that drains are required. Bridge deck overhang design 272018 4 reducing collision forces aashto procedure requires more reinforcement 3 x ft design for barrier capacity past practice required less reinforcement lower design forces indot and other states reduce collision force 1. Beam a long, rigid, horizontal support member of a structure. May 2016 lrfd bridge design 81 wood is used for many bridge applications.
References to lrfd design specifications refer to the current aashto lrfd bridge design. This design should always be used unless approval to use a thinner deck is obtained from the state bridge engineer. Abstract the purpose of this example is to illustrate the use of the aashto lrfd bridge design for the design of a continuous two span steel igirder bridge. See the current staff bridge design memo 601 for descriptions of effective span and general deck slab design information. The transverse deck example goes through the design of two deck types, a transverse spike laminated and a transverse glulam. The lowes deck design tool is a deck builder that helps you design the deck youve been dreaming about. Structural design guidelines for concrete bridge decks. The steel girders have fy 50 ksi and all concrete has a 28day compressive strength of fc 4. The empirical design method requires less reinforcement in the interior portions of the deck than the approximate method. The bureau of design and environment bde shall publish and maintain a manual that establishes uniform policies and procedures for the location, design, and environmental evaluation of highway construction projects on the state highway system.
Reinforced concrete slab design using the empirical method. Evaluate existing test hole data not much before 1940. View example in pdf format design example 2 download example as a mathcad workbook zip. Notes author staff bridgesight software sponsor bridgesight software. A twospan continuous composite igirder bridge has two equal spans of 165 and a 42 deck width.
It gives two worked examples, one for a multigirder bridge and one for a ladder deck bridge. Lrfd bridge design specifications 2017, along with three design examples illustrating the application of the design procedure. Safety and ethics are satisfied by the adherence to the aashto lfrd bridge design specifications. For example, applied, tabulated, and allowable bending stresses are. Department of transportation federal high way administration bridge deck design. Lrfd bridge deck design u20deck overhang a yield line analysis produces the nominal railing resistance. The example illustrates bridge deck design in accordance with the aashto lrfd. Steel bridge, deck design, concrete deck, precast concrete deck, wood deck, metal grid deck, orthotropic. Mahan1 abstract the newly approved aashto guide specification for lrfd seismic bridge design referred to as lrfd seismic guide spec, july 2007, is greatly influenced by caltrans seismic design. Many references to section 5 of aashto have been updated to reflect the. Steel bridge design handbook federal highway administration.
The required design input at the strength limit state is shear force. The best deck designer online or the easiest deck design software on your desktop. Once your design is complete, show it off in a variety of common graphics formats such as a pdf. Lrfd seismic bridge design, california example mark s. Structural design guidelines for concrete bridge decks reinforced with corrosionresistant reinforcing bars abraham lama salomon graduate research assistant cristopher d.
Straw bridges 2 of a structure is the weight that is added to the structure, including people, cars, and wind. The design of the wooden deck follows the procedures of the timber bridges. Structures design office lrfd design examples files pdfs. July 2019 276 the required design input for the design of an elastomeric bearing at the service limit state is dead load, live load plus dynamic load allowance, minimum vertical force due to permanent load, and design translation. One possible solution to the deck forming problem is the use of stayinplace steel deck forms. Bridge design guide the texas department of transportation ftp. Twospan continuous straight igirder bridge design example. After you have drawn the bridge design to scale, i like to pencil in some more information. It will also provide design aids and other sources of information along with cross references to other parts of this manual to assist in the design and preparation of plans. Here is a best free bridge design software list for windows. Twospan continuous straight wideflange beam bridge. Innovative bridge designconstruction techniques to.
Pdf analysis and design of tgirder bridge at balkumari, kathmandulalitpur find, read and cite all. Worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010. These topics and design examples are published separately for ease of use, and available for free download at the nsba and fhwa websites. Chapter 5 design of wood framing the principal method of design for woodframed construction has historically been allowable stress design asd. Chapter 15 structural design requirements for designbuild. Bridge railing deck design example lrfd bridge deck design u20deck overhang. These freeware can be used by aspiring civil engineers to design and analyze different bridge types. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. Well show you how to build a deck, whether you want a diy deck or you want us to help with your deck designs. Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010.
Unless noted otherwise in this chapter of the ndot structures manual, the lrfd specifications applies to the design of bridge decks in nevada. The maximum length of the bridge deck before expansion joints are required is. Finally, a design example for a reinforced concrete bridge deck is provided. Beam bridge a bridge that consists of beams supported by columns piers, towers. The bridge design manual shall be consulted for deck drain policy requirements. Design of reinforced concrete bridges department of civil. As stated in the policy manual, txdot bridge design manual lrfd, limit concrete strength at time of. Two of the design examples illustrate the application of the procedure to the design of bolted field splices for igirder flexural members, and the last design example. Appendix a design example for simple span bridge appendix b. Department of civil and environmental engineering virginia polytechnic and state university vctir project manager. Evaluation of performance and maximum length of continuous decks in bridges part 2. Minimum negative flexure concrete deck reinforcement article. The contractors also indicated that the best way to build bridges faster was to allow the entire bridge to be closed and the reconstruction to occur all at one time. These files consist of rcpier example input files and documentation on the use of rcpier for a typical lrfd tpier design.
More detailed design related to specific bridge types. Consultant resources illinois department of transportation. Trbs second strategic highway research program shrp 2 report s2r19arw2. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes. The following is a summary of the major changes that have been incorporated into the deck design guide. Live load distribution factors for a three span continuous pre. Pdf steelconcrete composite bridge design guide researchgate. The following are the reference materials when executing a consultant agreement for highway work. Title reinforced concrete slab design using the empirical method publication no.
Analysis, design, rating, and drafting of wood bridge. Customize with a variety of choices for deck railings, decking posts and other decking materials like composite decking. These topics and design examples are published separately for ease of use, and available for free download at the nsba. Design of a reinforced concrete deckgirder bridge to aashto.
These basically analysis your bridge design to find whether it is stable or unstable. It is a companion to a publication giving general guidance on composite highway bridge design. The first goal was accomplished by development of guidelines for design, construction, and geometry control based on successful methodology. Lrfd bridge deck design bridge deck design requirements are covered under idm chapter 404. The manual for design, construction, and maintenance of orthotropic steel. For example, road bridges, railways bridges, and footbridges. As stated in the policy manual, txdot bridge design manual lrfd, limit concrete strength at. The deflection of the deck under design live load shall not exceed 1240 of the span or 1, whichever. Lrfd steel girder superstructure design example lrfd. It is used as a primary structural material for permanent bridges on secondary roads e. The safety of our design is ensured by abiding to the provisions within aashto. Bss090119991 abstract this design example illustrates the empirical design method for composite concrete bridge decks specified in article 9.
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