Posttensioned box girder bridge an analysis approach using. Have a well founded knowledge of design specifications. Specifications and only straight steel bridges are covered in the provisions as of this writing. It provides a basis for the design of both concrete and steel box bridges, and special attention is paid to stability problems, shear lag phenomenon. Heins september, 1937 december 24, 1982 during the past decade, there has been extensive use of steel box girders for straight and curved highway and transit structures. The box is typically rectangular or trapezoidal in crosssection. For a particular girder span and bridge width, a large number of parameters control the design of the bridge such as girder spacing, cross sectional dimensions of girder, deck slab thickness, number of strands per tendon, number of tendons, deck slab reinforcement, configuration of tendons, anchorage system, prestress losses, concrete.
An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Bridges with composite steelconcrete box girder deck have been adopted in numerous cases. The design is based on requiring the deck to act as a rigid assembly of longitudinal and transverse members. Proposed design specifications for steel box girder bridges. 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. I1 problem statement a design example for a bridge consisting of a steel igirder superstructure integral with a steel boxbeam pier cap supported on a single reinforced concrete column is presented. Attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steelgirder bridge, and a cablestayed bridge. It was only with the development of high strength prestressing steel that it. Design and rating for curved steel i and boxgirder bridge structures c.
Design of steel and composite bridges highway bridges. This redesigned solution provides significant savings with the elimination of a large falsework support system, reduced construction time, reduced foundation design requirements and simplified construction. Mar 27, 2019 attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steelgirder bridge, and a cablestayed bridge. E1 is fully restrained against lateral buckling throughout its span. In this paper a detailed parametric design optimization of the main girder of box type is performed. This document is available to the public through girder, tub girder, curved girder, top flange lateral the national technical information service, springfield, va bracing, leanon bracing 22161. It calculates the envelopes for all the required design forces inlcuding vertical loads and horizontal effects of the moving cranes, moments and deflections. A detailed and extensive procedure which describes the modeling, analysis, and design of a 3d steelframe pipe rack system.
The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Responsibility wolchuk and mayrbaurl, consulting engineers. Posttensioned box girder bridge an analysis approach. In doing so, finleys foursteel box girder design produced significant savings in construction costs over an initially proposed castinplace concrete box girder design. A beginners guide to simple plate girder design to ec3 part 15. Design of prestressed concrete igirder bridge superstructure. Design and rating for curved steel i and box girder bridge structures c. Design guidelines for steel trapezoidal box girder systems. Indicate component details, materials, finishes, connections, and joining. Heins september, 1937 december 24, 1982 during the past decade, there has been extensive use of steel box girders for straight and curved highway and transit. Guidelines and tutorial for modeling haunched steelgirder bridges. The third edition of the design specifications, to be published in 2004, will contain a complete set of new provisions for the design of straight steel i and box section flexural members within articles 6. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of.
Guidelines and tutorial for modeling haunched steel girder bridges. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Figure 34 deformations of different box girder bracing systems. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. The design output includes deflection, bending moment. This paper discusses the coordinated design research program conducted under the sponsorship of the united states steel corporation, on. Steel bridge, bracing, bracing system, bracing design, i no restrictions. Yield stress of steel, fy 250 nmm 2 material factor for steel.
Analysis and design of prestressed box girder bridge by irc. Preferred practices for steel bridge design, fabrication, and. A box or tubular girder is a girder that forms an enclosed tube with multiple walls, as opposed to an ior hbeam. The past in 1965 the criteria for design of steelconcrete composite box girder bridges. Steel box girder with advance design america bridge solution. Double girder box girder over head cranes are used for heavy duty applications in the industry. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an all steel configuration. Steel tub girder bridge, steel box girder bridge, lrfd. This document is available to the public design example, steel bridge through the national technical information service, springfield, va 22161. Pdf optimum design of multispan composite box girder bridges. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in. Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions.
The governing criterion for the use of single box girders on these sites was the relatively narrow 9. In design specification, maximum bending moment at pier from construction phase are the concerns since the results to determine prestressed force, number of strand and cable arrangement. This book, which discusses the basic problems which appear in boxgirder analysis, introduces progressive methods and proposes ideas which challenge current concepts. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. The spreadsheet focus on design of prestressing cable for boxgirder bridge using balanced cantilever method. Longitudinal analysis of steelconcrete composite box girder. A box girder bridge is an apparent bridge sector in which main beams contain girders in the hollow box shape. Steel box girder bridges have become an accepted method of constructing highway bridges. Pdf composite steelconcrete box girders are frequently used in bridge construction for their economic and structural advantages. While the design examples consider box girders of constant depth. The box girder usually includes either structural steel, prestressed concrete or in the form of reinforced concrete or composite section. Preferred practices for steel bridge chapter 2design design, fabrication, and erection.
The advantage in using an all steel configuration is that the whole cross section, including parapets, can be fabricated at the works for delivery and erection in complete spans. Pdf analysis and design of post tensioned box girder. This document is available to the public through girder, tubgirder, curved girder, top flange lateral the national technical information service, springfield, va bracing, leanon bracing 22161. For example, the aisc manual includes a table of beam shear, moment, deflection, and. 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. In addition, a design example for a twospan plate girder superstructure is included. Steel tub girder, steel box girder, lateral bracing, no restrictions. Design to ec3 part 15 nanyang technological university. Study of bridges with composite steelconcrete box girder decks. Appendix b example problems transportation research board. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Proposed design specifications for steel box girder. The program supports several classes of cranes, multiple steel sections, capping sections, and multiple cranes on a single girder. The third edition of the design specifications, to be published in 2004, will contain a complete set of new provisions for the design of straight steel i and boxsection flexural members within.
I1 problem statement a design example for a bridge consisting of a steel i girder superstructure integral with a steel box beam pier cap supported on a single reinforced concrete column is presented. Originally constructed of riveted wrought iron, they are now made of rolled or welded steel, aluminium extrusions or prestressed concrete. Structural steel 1 of 18 rev plate girder design project. This horizontally curved steel box girder br idge design example was originally developed in the nchrp 1238 project using the 1993 aashto gu ide specifications for horizontally curved steel girder bridges. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed.
Bridges with composite steel concrete box girder deck have been adopted in numerous cases. Once the box girder section type was approved by the gtaa, four bridge sites were identified as suitable locations for implementation of the single steel box girder structures. Box girder bridge design american institute of steel. Structural steel design project calculation sheet checked by pu date 250400 problem. Having multiple vertical webs, it can also carry more. Analysis and design of prestressed box girder bridge by. Oct 02, 2012 seminar bridge design with eurocodes jrc ispra, 12 october 2012 3 application s partie 2 generic bridges partie 7. Continental steel public seminar, 6 august 2014, ntu design of plate girder design of plate girder shear resistance if the web is stocky, no shear buckling of web shall occur and the shear strength of the web is given by ec3 part 11 if the web is not stocky, shear buckling governs the failure. Pdf optimization of box type girder of overhead crane. Computerised design of boxgirder bridge using balanced. Steel bridge tutorials computers and structures, inc.
The authors, however, did note that the aisc manual of steel construction does. Pdf study on the behavior of box girder bridge researchgate. Apr 22, 2016 steel box girder with graitec advance design america bridge solution, structural analysis and design software. Competitive steel and composite bridges by improved steel plated. Finley used lusas bridge for its engineering redesign of the estero parkway flyover in fort myers, florida, for the contractor, zep construction. Box girder bridge design, engineering journal, american institute of steel construction, vol. It was updated to illustrate the applicability of the revisions to the aashto. Eliminatereduce mergingsplitting geometrywhere bifurcations are required on.
Box girder bridges are commonly used for highway flyovers and. Design and rating for curved steel i and box girder. Class 5000 or higher used in cip posttensioned concrete box girder construction, deep bridge foundations, or in other special structural applications if significant economy can be gained or structural requirements. Astm a 709 grade hps 70w for flanges in negativeflexure regions astm a 709 grade 50w for all other girder and crossframe steel concrete. This tutorial provides an introduction to the assignment of joint patterns. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Homogenisation rules for distortion in steelconcrete composite box girders.
Diaphragms crossframes through girders the beam or girder is fully braced at a location if twist is prevented. Key words steel tub girder bridge, steel box girder bridge, lrfd, bolted field splice, top flange lateral bracing, box girder distortional stresses 18. The advantage in using an allsteel configuration is that the whole cross section, including parapets, can be fabricated at the works for delivery and erection in complete spans. Characteristics design of gantry girder is a classic example of laterally unsupported beam.
Concrete structures chapter 5 wsdot bridge design manual m 2350. Study of bridges with composite steelconcrete box girder. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. The span is 36 m and carries two concentrated loads as shown in fig. Steel box girder with graitec advance design america bridge solution, structural analysis and design software. Originally constructed of riveted wrought iron, they are now made of rolled or welded steel, aluminium extrusions or prestressed concrete compared to an ibeam, the advantage of a box girder is that it better resists torsion. 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. It provides a basis for the design of both concrete and steel box bridges, and special attention is paid to stability problems, shear lag phenomenon, and to the problem of stress state arising in the web of a steel girder subjected to large concentrated loading. A new precast, prestressed box girder bridge design suitable to u. This type of solution has the benefit of having great resistance relatively to its own weight, resulting from the optimization of steel and concrete properties. Correspondingly, the problem has been analyzed and designed for flexure and shear by. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. Proceedings of an international conference held on 14 february 1973.
Steel box girder redesign of estero parkway flyover. A box girder bridge also known as a box section bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. Steel bridge design handbook fhwa us department of. Steel box girder bridges this title is part of the ice publishing complete digital collection helping ensure access to essential engineering content from past to present. Appendix i design example integral steel boxbeam pier. A detailed and extensive procedure which describes the modeling, analysis, and design of a 3d steel frame pipe rack system. Finleys redesign replaces previously proposed twin, castinplace concrete box girders with a single, foursteel box girder design. Compared to an ibeam, the advantage of a box girder is that it better resists torsion. The design is based on requiring the deck to act as a rigid assembly of longitudinal and. Introduction box girders have become a prominent element in the con. Design specifications and commentary for horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. Seminar bridge design with eurocodes jrc ispra, 12 october 2012 8 box girders.
Design guidelines for steel trapezoidal box girder systems 6. One of the example problems is based on the box girder bridge erected over the intracoastal waterway at corpus christi, texas, and is essen tially a documentation of the preliminary design procedure used in devel opment of the structure. This paper discusses the coordinated design research program conducted under the sponsorship of the united states steel corporation, on the subject of steel box girder bridges. Bd619m provides design guidance on combining the stability bracing forces. American and japanese design and detailing practices of prestressed concrete box girder bridges are compared.