The twoway floor system may be either a through plate girder or deck structure depending upon whether the floor beams are placed near the bottom or the top flange of the girders. However, since the example bridge does not have a wearing. These examples are intended to help designers understand the key issues as they undertake wood highway bridge design. This manual is intended to be a guide for engineers working on bridge design projects for the wvdoh. This design should always be used unless approval to use a thinner deck is obtained from the state bridge engineer. This manual documents policy on bridge design in texas. Dec 02, 2017 problem of design of deck slab bridge part 12. Structural design guidelines for concrete bridge decks. The empirical design method requires less reinforcement in the interior portions of the deck than the approximate method. The girders are typically uniformly spaced transversely with the deck extending past the fascia girders, thereby resulting in an overhang. The bridge design detailing manual guidelines listed below are developed and maintained by the structure design detailing technical committee within the division of engineering services des. Design of concrete structures shall be based on the requirements and guidance cited.
It is usually desirable to keep the depth of structure base of rail to low. Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010 support to the implementation, harmonization and further development of the eurocodes. The integral wearing surface is considered in the weight calculations. Special design example 5172017 20 from earlier in the memo, for a 7 slab with 2 wearing course, eod thickness and. One bridge has a gluedlaminated deck and the other has a stresslaminated deck. Task order dtfh6102t63032 41 design step 4 deck slab design design step 4.
Structures design office lrfd design examples files pdfs. Deck overhang design minnesota department of transportation. Twospan continuous straight igirder bridge design example. Types of girder splices the most common precast concrete girder splice used in the construction. Bridges with timber decks on low volume secondary roads may have timber railings. The bridge design code provides detail of design principles, loads and standards to which all bridges designed by, or for, mrwa must comply. Design step 4 design of deck prestressed concrete bridge. The majority of traffic railings are reinforced concrete. Bridge publications texas department of transportation. Economical constraints on the design of bridges usually necessitate the use of as few girders as possible across the bridge width. It does not, however, cover the application of these principles. This example rates the deck of the superstructure for bridge bid12 in the sample database delivered with brr. For longitudinal beam bridges, two conditions are checked in the transverse direction to design the deck reinforcing steel.
The precast deck panel system is designed using the strip design method, where a transverse strip of the deck is analyzed as a continuous beam supported by the bridge girders. More detailed design related to specific bridge types. Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010 support to the implementation, harmonization and further development of the eurocodes y. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. Design and load rate the first interior girder girder b. Pdf design step 4 design of deck prestressed concrete. Pdf 3 analysis and design of deck slab satya narayana. The link connects to the waterstones bookshop to buy online.
The design provisions are presented in the form of suggested aashto bridge design specification changes based on a synthesis of the findings from both the durability and structural phases of the study. Department of civil and environmental engineering virginia polytechnic and state university vctir project manager. This section provides design guidance and construction requirements for. The bridge is assembled somewhere near the existing bridge. Laurence davaine, french railway bridge engineering department sncf, igoa. Send technical questions to the applicable technical owner or technical manager. These standard guidelines, examples and checklists assist engineers and detailers to produce preliminary design studies, contract plans and other. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 42 dead and live loads acting on the deck. Concrete bridge lrfd specifications parsons brinckerhoff page 7 4. The intent is to provide guidance as well as an interpretation of aashto lrfd bridge design specifications specific to new mexico bridge design. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported.
Simple span reinforced concrete slab bridge rating example. Lrfd bridge design manual details our policies regarding the design of bridge railings for mndot projects. It is not intended to replace the aashto lrfd bridge design specifications or any other design guide or regulatory code. Mb0216 joist spacing double s p a c i n g safe spacing l in inches of supports for double ledger continuous overthree or more spans 1 all values based on 2005 nds for lumber species with the above properties. Please direct any questions on the content of this document to the bridge design section director, bridge division, texas department of transportation. For bridge deck design load determination, the design code has a specified truck to.
Evaluation of the empirical deck design for vehicular bridges. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes. Reinforced concrete, steel, and timber are all used for railings. Hambly covers methods of analysis of various types of bridge decks. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation of the aashto lrfd bridge design specifications, and is offered in both us customary units and standard. Lrfd bridge deck design bridge deck design requirements are covered under idm chapter 404. Typically the two uniform loads applied to a slab are a dc2 load for the barrier and dw load for the wearing surface. It assists texas bridge designers in applying provisions documented in the aashto lrfd bridge design specifications, 2017, 8th edition, which designers should adhere to unless directed otherwise by this document. Threespan continuous straight composite steel igirder bridge 5. Second, the superstructure of the bridge is the horizontal platform that spans the space between columns.
References to lrfd design specifications refer to the current aashto lrfd bridge design. Example problem to illustrate the content of structural wood design using asd and lrfd, an example problem has been reproduced on the following pages. This sin glespan and sharply skewed bridge is an example of the versatility of spliced 1girder bridges. Structural design guidelines for concrete bridge decks reinforced with corrosionresistant reinforcing bars abraham lama salomon graduate research assistant cristopher d. Guidance for handling asbestos in construction projects. Steel bridge, deck design, concrete deck, precast concrete deck, wood deck, metal grid deck, orthotropic deck 18. The existing bridge is lifted and set down somewhere for demolition.
The guidelines for nonlinear analysis for bridge structure presents a collection of general recommendations for the modeling and analysis of. Problem of design of deck slab bridge part 12 youtube. Lrfd design examples federal highway administration. The guidelines for nonlinear analysis for bridge structure presents a collection of general recommendations for the modeling and analysis of highway. It provides policies, procedures and methods for developing and documenting the design process. Design of deck reinforcement, including flexural resistance, limits of reinforcement, and control of cracking is based on aashto lrfd bridge design specifications 5. Bridge deck drainage roadway and bridge deck profiles shall be adjusted as much as possible to avoid having bridge drains on the bridge. Bridge design bridge design books for bs 5400 and eurocodes. Chapter 17 superstructure general january 2020 173 17. Twospan continuous straight wideflange beam bridge design example.
Examples of bridges of this type built by the states of tennessee and. It is a companion to a publication giving general guidance on composite highway bridge design. Slab bridges are defined as structures where the deck slab also serves as the main loadcarrying component. Lowcost design alternates, which include reducing the number of steel girders with hps. An example showing the practical application of the proposed recommendations. Bridge design guide txdot january 2020 feedback for txdot policy on designing bridges, please refer to the txdot bridge design manual lrfd. A steel gridreinforced concrete deck system, which can be precast prior to installation, for both temporary and permanent bridge decking applications.
The strip method concept results in providing the main reinforcement in the transverse direction of the deck. Chapter 15 structural design requirements for designbuild. Loading from the superstructure has been taken from the reinforced concrete bridge deck example. The manual is intended to fill a gap not covered by either the bridge design code or standard text books. Performing organization name and address hdr engineering, inc. This example superstructure was also entered in the tmbr1singlespantimberexample problem. Mar 19, 2014 click on a datetime to view the file as it appeared at that time. Deck design follows the nmdot standard deck slab detail in chapter 4 of the nmdot bridge procedures and design guide, hereinafter referred. Design calculations for reinforced concrete abutments, wing walls and pier of a hypothetical two span bridge deck to illustrate the requirements of bs 5400 part 2 loading and part 4 for design of concrete bridges. 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. Nhi course 081 load resistance factor design lrfd for highway bridge superstructures, design examples pdf, 7. These books can be purchased from ice publishing by clicking on the book to link through to their web site. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Steel bridge design had not been standardized each bridge was an original design that requires time and money, whereas concrete bridges are standardized designs the sssba developed standard simplespan and modular designs espan140 short span steel bridge design.
This bridge design manual was prepared by siteblauvelt engineers, inc. The following report provides comprehensive analysis of the advantages and. Western bridge preservation partnership meeting phoenix, arizona may 1214, 2020. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 43 for this example, a slab thickness of 8 in. It is a uniformly loaded beam with an overhang, and it is to be designed for the simultaneous application of dead and snow load.
View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples. The following design method can be used for normal weight concrete with specified compressive strengths up to 15. If bridge geometry is such that drains are required, the number of drains should be minimized as much as possible while still providing a bridge deck drainage design that meets required standards. The girders are considered rigid supports with no settlement. This design guide provides a procedural outline for the design of basic slab bridges using the lrfd code and also includes a worked example. Railroad bridge design replacement technologies selfpropelled modular transporters spmts could allow for the bridge to be replaced in one piece. Chapter 38 railroad structures january 2019 387 deck structure desirable. Design of transversely prestressed concrete bridge decks. Timber tutorial aashtoware bridge design and rating.
The guidelines for nonlinear analysis for bridge structure presents a. Problem on design of rc deck slab part 22 duration. This example demonstrates rating a timber deck in brr. Pgsuper models the various construction stages with construction events. Another notable bridge is the esker overhead, shown in fig.