Projects which includes drawing layouts, checklists and standard notes requirements. This bridge was launched in two trains, one from each side of the river. Scan the notes or convert electronic files and gather them into a single pdf file. Closure of the bridge was accomplished at midspan of the main span. The following illustrates the process for a multigirder bridge. This project outlines the design of both a steel and concrete girder system and their respective components piers, abutments, bearings, expansion joints, etc. Worked examples presented at the workshop bridge design to eurocodes, vienna, 46. Typical multigirder cross section of a composite bridge with rigid traffic barriers and. There has been a significant body of research and development relative to the design and analysis of curved prestressed concrete box girder bridges. The third edition of the design specifications, to be published in 2004, will contain a complete set of new.
The behavior of box girder section for a general case of an eccentric load has been s tudied and presented its studies in chapter 2. Created a new prestress girder example from the pci bridge design manual example 9. Design of posttensioned girder anchorage zones by w. This chapter also addresses corrosion protection measures. Continuous straight composite steel tub girder bridge. Girder analysis and design is performed using the computer. It provides advice, for those already acquainted with the design of composite ibeam bridges, on the particular aspects of box girders bridge design and the. Several types of truss girders are used in bridge design. Chapter 14 prestressed concrete girders transport and main. Railroad box girder bridge near redland, ok in 1970 durkee 1972. Notes bridge design box girder bridges free download as pdf file.
Aashto lrfd bridge design specifications specific to new mexico bridge design practice so that uniformity in bridge design procedures will be attained. Moi university school of engineering department of civil and structural engineering course code. Tgirder design example note the engineering community. Girder bridges are the most natural and simplest form of bridging between two points. Note that if the main girders of the arrangement shown in figure 2. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation of the aashtolrfd bridge design specifications.
Prestressed concrete girder design for bridge structure spreadsheet 4 january 2018 off moving wheel loads analysis 15 january 2019 off concrete box culvert analysis and design spreadsheet. Concrete strengths above 70 mpa need to have laboratory testing veri. The superstructure design includes the following elements. Analysis and design of prestressed box girder bridge by. Primary components of main members tension or compressions iv. Bridge design specifications second edition, 1998, including interims for 1999 through 2002. Notes bridge design box girder bridges bending stress.
Analysis and design of prestressed box girder bridge by irc. General design and location features 2 5 3 constructability2. Pdf steelconcrete composite bridge design guide researchgate. Precast prestressed concrete igirder bridges have become the most dominate bridge system in the united states. If the girder is an edge girder, approximately 85% of the total shear will be carried by the girder under consideration. The actual notes required depend on the girder classification. Design guidelines for bridge widenings, steelreinforced elastomeric bearings fo r pretensioned concrete beams, stru tandtie method, and culverts. The use of girder as a natural bridging element is abundantly evident in nature, such as a fallen tree trunk over. Design guidelines for steel trapezoidal box girder systems. Identification of steel bridge members a show notes about charpy vnotch cvn and fracture critical member fcm requirements as applicable. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. The design of steel structures is covered in section 6 of the aashto lrfd bridge design specifications and only straight steel bridges are covered in the provisions as of this writing. Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges.
Criticalessential bridges are not specifically addressed in the aashto guide. Bharil, in innovative bridge design handbook, 2016. Becht engineering recently completed the structural analysis for a single girder 5ton crane bridge with an underrunning hoist per cmaa74 for nuclear waste handling operations. Some of this information has found its way into design specifications, while much of it has not. Design aids of nu igirder bridges nebraska department of. The vertical reinforcement to maintain bars during concreting and the. Adopted and published by the american association of state highway and transportation of. From girder end midspan of noncomposite beam girder top stress. Distributed equally to each girder b s d i basic lrfd design live load hl93 article 3. Cmaa is the crane manufacturers association of america, and cmaa74 is the specification for top running and under running single girder electric traveling cranes utilizing.
A plane truss girder may be considered as a deep beam where the flanges are the compression and tension chords of the truss and the web of the beam is replaced by an open triangular system which resists the shear forces. Designers who have not designed prestressed concrete bridges, but have used either aashto specification to design other types of bridges may be able to follow the design example, however, they will first need to familiarize themselves. Office policy for concrete and steel bridge design is as follows. Policy for archiving bridge design notes in txdots bridge inspection database. Connecticut department of transportation bridge design manual b1 structural steel notes b. A design example followed by a load rating analysis illustrates the engineering computations performed by pgsuper. Nchrp project number 1271 transportation research board. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. The design criteria is to strengthen the girder to obtain a hs20 live load rating factor equal to or greater than 1. This example is based on aashto lrfd bridge design specifications, 7th edition.
Bridge design guide 32 txdot january 2020 section 1 general recommendations prestressed concrete beam and girder design txdots policy is held firmly to a 6. Standard design and details of pressbrakeformed steel. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrica. Design guidelines for steel trapezoidal box girder systems 6. Introduction in 1993, the american association of state highway and transportation officials aashto adopted the load and resistance factor design lrfd specifications for bridge design. Comprehensive design example for prestressed concrete girder. Chances are very high that today, a bridge engineer will learn how to design a bridge girder before any other bridge type. This manual is intended to provide general guidance, and not solutions that are specific to any project. This design example, plate girder shear and flexural strengthening i,nvolves the addition of steel strenghening material to an existing steel plate girder. Design step 5 design of superstructure prestressed.
Deck design follows the nmdot standard deck slab detail in chapter 4 of the nmdot bridge procedures and design guide, hereinafter referred to as design guide. The design criteria is to strengthen the girder to obtain a. This guide offers an introduction to the design of steel and composite railway bridges, for readers who are generally familiar with the principles of limit state design. Extend bearing stiffeners the full height of the girder. Detailed tables showing all results and intermediate values are available for display, printing, and export to excel or access. Lrfd 3rd edition threespan continuous straight igirder 1. Design of reinforced concrete bridges department of civil. Holes may be required if the bridge is subject to flooding. Structural design guidelines for concrete bridge decks reinforced with corrosionresistant reinforcing bars abraham lama salomon graduate research assistant cristopher d. Design step 5 design of superstructure prestressed concrete. New bridge design information is continually developing. Past manual notices are available in a pdf archive. Comprehensive design example for prestressed concrete.
It is therefore important to ensure that all of the bridge components are correctly designed for the applicable loads, following the methods and criteria. Bridge design guide the texas department of transportation ftp. Girder classifications shown below, and the notes required for each. Use is made of a computer program to compare the behaviour of alternative girder support systems and the advantages and disadvantages of each is summarized. Governing shear occurs when the design heavy vehicle is placed directly over a girder adjacent to a support. The publication has been prepared by mr d c iles the steel construction institute. The existing bridge was designed for hs20 live loading. Appendix b, pretensioned concrete u beam design guide. Structural design guidelines for concrete bridge decks. The girder is to be strengthened due to section loss from corrosion. For nonparallel tub girders, in addition to midspan requirements, article. In this paper, cost optimization approach of a posttensioned pc igirder bridge system is presented.
Department, sri vasavi institute of engineering and technology, andhra pradesh. Department of civil and environmental engineering virginia polytechnic and state university vctir project manager. Concrete bridges semiintegral design is used for prestressed concrete girder bridges under 450 feet long and for posttensioned spliced concrete girder and castinplace post. Notes to usersof the lecture this session is a basic information about actions on bridges and requires about 60 min lecturing. Indot structures conference 0727 10 steel superstructures 6 steel superstructures aashto section 2. The continuous composite deck is made up of two steel girders with i. Bridge cadd drawing menu idaho transportation department. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 549 sample calculations at 54 ft.
The manual focuses on the design and detailing of nu girder bridges. Crane girder design crane girder details proper detailing is the key to good fatigue performance the vast majority of crane girder performance issues occur at the crane girder to column connection. Concrete strengths below 16 mpa should not be used. Policy for archiving bridge design notes in txdots bridge inspection database management system. Show distances from the centerlines of bearings to the ends of girders.
Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Apr 04, 2014 in summary, a good crane bridge design is critical since the crane loads are large and cyclic, and a component failure could affect life, safety, equipment, and in some cases the environment. Some experience of bridge design, perhaps of the design of highway bridges, would be advantageous in understanding the detailed design procedures. Design results are displayed graphically for the entire concrete slab bridge section. In the case of a single design done for twin structures, submit the same notes under two separate nbi numbers. The new design aids provide bridge designers with different alternatives of girder section size from nu900 to nu2000, girder spacing from 612ft, number of prestressing strands up to 60.
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