The reaction from that lane is moved across the width. It is a companion to a publication giving general guidance on composite highway bridge design. For example, the aisc manual includes a table of beam shear, moment, deflection, and. Girder analysis and design is performed using the computer program conspan, version 09.
Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5. 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 i girder bridge. Only use single box girder as a deck in cantilever bridge. This three span precastprestressed girder example features a single long span in the middle along with two short side spans, as shown in. Pdf comparative study of rcc t girder bridge design. This report discusses the design and construction of spliced girder bridges. Precamber girder example pgsuper training 4222019 1. For free electronic pdf download on the fhwa infrastructure website. Design of deck reinforcement, including flexural resistance, limits of reinforcement, and control of cracking is based on aashto lrfd bridge design specifications 5. In that example, girder design and detailing is evaluated extensively.
The primary goal of the collaboration is to achieve steel bridge design and construction of the highest quality and value through standardization of the design, fabrication, and erection processes. In modern girder steel bridges, the two most common shapes are plate girders and box girders. This example illustrates new mexico department of transportation nmdot design procedures for a threespan prestressed concrete girder bridge. Standard short span steel girder bridge designs goals. Rcc t girder bridge s ystem daas khola bridge has be en considered in this thesis work. Pgsuper uses a stateoftheart iterative design algorithm and other iterative computational procedures. For example, steel plates are usually hot rolled, and cast steel may be used. Computerised design of boxgirder bridge using balanced. Presentation on fhwas posttensioned box girder design manual. This example illustrates the design of a two span castinplace posttensioned concrete box girder bridge. Wisdot bridge manual chapter 19 prestressed concrete.
For slightly skewed lg girder bridges, these standard bearings may still be used, however the eor shall check for skew condition per aashto spec. Adapt software help documentation, videos, and more to. Rehabilitating concrete box girder bridges designed to show you bridge. A design evaluation followed by a load rating analysis illustrates the engineering computations performed by pgsuper. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design specifications second edition, 1998, including interims for 1999 through 2002. The following design method can be used for normal weight concrete with specified compressive strengths up to 15.
Impact of lrfd specifications on design of texas bridges. Acecncdot spliced girder workshop continuous span projects route 33 bridges, west point, va 2 bridges. Hoist trolley that of box girder bridge design example pdf search engine that bridge. Threespan continuous horizontally curved composite steel i girder bridge rivera and chavel 2015. Concrete box girder bridge design example pdf download.
After the number of girders has been determined, adjustments in girder spacing should be investigated to see if slab thickness can be minimized and balance between interior and exterior girders optimized. Its basic design, in the most simplified form, can be compared to a log ranging from one side to the other across a river or creek. The example shows how both the vertical and horizontal deck geometrics affect the deck profile above the girders, and thereby affect the haunch depths. For example, for a concrete slab on a steel girder d 5. Pdf lrfd design example for steel girder superstructure. On the other hand, although the preliminary discharge calculations for. This document follows the steel bridge design handbook sbdh design example 3. Rail height mm effective length factor typical span crane step size m dead load factor live load factor combined load factor. Design step 5 design of superstructure prestressed concrete. The bridge has three spans of e ach 25 m length and double lane width. A twospan bridge example is used here to illustrate the design steps in detail. Key words prestressed concrete, lrfd, design, bridge girders, u54. The hydrological analysis was conducted mainly to derive design flood. Mattaponi and pamunkey rivers currently under construction each bridge has two 4span units with 200240240200 spans 8 ft deep girders haunched to 106 deep at piers barge delivery of segments.
A design example followed by a load rating analysis illustrates the engineering computations performed by pgsuper. Steel plate girder bridge design using indian standard method. Detailed design examples for an aashto type iv girder and a texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. Nonstandard steelreinforced elastomer bearings including circular bearings are typically needed for steel girder bridges. Concrete composite boxgirder bridge a construction manual. Based on the findings and results of nchrp project 121, the. In all cases, the appropriate multiple presence factor is applied. This is one of the most common types of structures used for freeway bridges and overpasses. Jul, 2018 a girder bridge is very likely the most commonly built and utilized bridge in the world. Therefore, the purpose of this paper is to present information relative to the design criteria in addition to information on pre liminary plate sizes, design aids, and computeraided design of steel box girder bridges. The example design of curved box girders presented in this chapter is in. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Design step 7 design of substructure prestressed concrete bridge design example task order dtfh6102t63032 739 supported on the girders. Prestressed concrete box girders unsymmetrical sections.
Lrfd design example for steel girder superstructure bridge with commentary final submission us units. The program is unique because it optimizes plate girder designs on the basis of least cost, not least. 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 use of bs 5400. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. From the comparison, the author comes out with a design example for both design method. Caltrans, bridge design aids manual, california department. Era bridge design manual and aashto bridge design specification usually.
The superstructure consists of two simple spans made continuous for live loads. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. The design process and corresponding calculations for steel i girders are the focus of this example. In the thesis touched on the type of box girder used for bridge and construction method used for construct bridge. Precastprestressed concrete institute pci, chicago, il. It gives two worked examples, one for a multi girder bridge and one for a ladder deck bridge. Design considerations for steel plate girder bridges. System development description of the conventional adjacent box girder system the design example in section 9. Wisdot bridge manual chapter 24 steel girder structures january 2021 245 24. Worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010. Design step 5 design of superstructure prestressed. 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.
Steel bridge design handbook design example federal. Design of reinforced concrete bridges department of civil. Lrfd design example for steel girder superstructure bridge. 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, prestressing strand diameter from 0. Design step 7 design of substructure prestressed concrete. The steel girders have fy 50 ksi and all concrete has a 28day compressive strength of fc 4. Finally, produce spreadsheet using microsoft excel for design and analysis previous studies a comprehensive study about design of box girder bridge using balance cantilever method 7. After the number of girders has been determined, adjustments in girder spacing should be investigated to see if slab thickness can be minimized and balance between interior and exterior girders. Loading single lane of class 70r or two lanes of class a.
The following report provides comprehensive analysis of the advantages and. Prestressed concrete bridge girder design examples. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Bridge design specifications second edition, 1998, including interims for 1999 through 2002. A comprehensive study about design of box girder bridge using balance cantilever method 7. By using excel spreadsheet, the author compares the weight of the plate girder bridge designed using both codes as the span increases with a fixed yield strength used.
Key words prestressed concrete, lrfd, design, bridge girders. Knight as a service to the bridge design profession, bethlehem steel has conducted hundreds of studies of steel plate girder bridges using its preliminary bridge girder optimization program. Lrfd design example for steel girder superstructure bridge us. Design of a reinforcedconcrete deckgirder highway bridge core. Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary in us customary units this document consists of a comprehensive design example of a prestressed concrete girder bridge. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Ncbc proudly sponsored a presentation by noted bridge engineer and author john corven on fhwas posttensioned box girder design manual. Adapt software help documentation, videos, and more to help. Learn about the csibridge 3d bridge analysis, design and rating program for the design and optimization of steel girder bridges with composite decks. 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.
Introduction box girders have become a prominent element in the con. Wisdot bridge manual chapter 24 steel girder structures. A sample analytical method for bearing resistance calculation. The continuous composite deck is made up of two steel girders with i. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation.
For precast girder bridges, interface shear design is considered across the between dissimilar materials such as the top of girder and bottom deck slab, at interface between girder ends and diaphragms at abutments or bents, spliced construction joints for spliced girders. Lrfd design example for steel girder superstructure bridge with commentary final submission. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge. The deck may consist of 3 girders spaced at 2, 45 m. T or i girder bridges are the most common example under this and width of the rib in the case of t, i and l beams design of reinforcement in box girder bridge concrete tbeam bridge design free download as pdf file. A twospan continuous composite i girder bridge has two equal spans of 165 and a 42 deck width. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal perpendicular alignment. In the thesis discussed the methodology used to design balance cantilever bridge. The guidance in this publication has been developed from earlier wellestablished guidance in a number of sci bridge design guides. 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.
64 275 107 1059 1473 1353 859 369 462 564 797 421 1220 192 849 1247 561 233 884 1137 461 1304 1546 1149 895 16 528 332 1218 453