Overview of reinforcedconcrete boxgirder bridgedesign capability. Design guidelines for steel trapezoidal box girder systems. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The various analysis nuances that can affect the results of a steel bridge analysis, and the implications of variations in the results of a steel bridge analysis. Download a pdf of development of design specifications and commentary for horizontally curved concrete boxgirder bridges by the national academies of sciences, engineering, and medicine for free. 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 authors have established a more accurate thinwalled beam theory of box girder, and, as an extension of the thinwalled beam theory, developed a theory of bending and torsion of the truss bridge. Pci bridge design manual 3rd edition, first release. As stated in the policy manual, txdot bridge design manual lrfd, limit concrete. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. The box is typically rectangular or trapezoidal in crosssection.
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. 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. The proceeding with development of roadway system all through the world is generally the consequence of awesome increment in movement, populace and broad development of metropolitan urban territories. 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. Steel tub girder, steel box girder, lateral bracing. For central angles exceeding 46 within any one span or for bridges with a maximum central angle in excess of 12 with unusual plan.
Loading single lane of class 70r or two lanes of class a. The design is based on requiring the deck to act as a rigid assembly of longitudinal and transverse members. The steel box girder may have longitudinal stiffeners on flanges and webs and transverse. Figure 4 this is a detail from the original 1958 engineering plan for the pretensioned girder design for bridge 6579 in st. This documentary photo, taken in 1968, shows the walnut lane bridge span, comprised of a parallel series of prestressed, posttensioned. Bridge design guide the texas department of transportation ftp. The formulation is based on the load and resistance factor design lrfd procedure. Measured behavior of a curved precast segmental concrete. Concrete boxgirder bridge design per aashto lrfd 2007. Concrete bridge lrfd specifications parsons brinckerhoff page 1 1.
Lrfd steel girder superstructure design example lrfd. Box girder bridges and retrofit procedures walter podolny, jr. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Box girder bridge design, engineering journal, american institute of steel construction, vol. Steel box girder with advance design america bridge solution. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Appendix a proposed lrfd specifications and commentary. Bridge division office of engineering federal highway administration washington, d. Design guide for composite box girder bridges steelconstruction. Although significant research has been underway on advanced analysis for many years to better understand the behavior of all types of boxgirder bridges, however, the results of these various research works are scattered and unevaluated. 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.
Such was the case with the box girder as it evolved from the principle of the initial bridge beam but. The steel box girder may have longitudinal stiffeners on. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. 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. 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. In this paper, cost optimization approach of a posttensioned pc i girder bridge system is presented. For this steel girder design example, a plate girder will be designed for an hl93 live load. Finally, an example of the analysis of a bridge composed of a continuousspan, posttensioned concrete box girder superstructure and a concrete pier is also demonstrated using the approximate equivalent load method.
This video contains transverse and longitudinal analysis of a single cell box girder bridge to determine design moment and shear for manual calculation of flexural and shear reinforcement of the. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Analysis and design of prestressed box girder bridge by irc. The deck may consist of 3 girders spaced at 2, 45 m. Introduction this example illustrates new mexico department of transportation nmdot design procedures for a threespan prestressed concrete girder bridge. Paul now replaced this shows three crosssections of one beam or girder. Box girder article about box girder by the free dictionary. While the design examples consider box girders of constant depth. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrica. Aug 28, 2017 this rating can be done withe csi bridge design 2015,2016, 2017 load combination, seismic and wind. This horizontally curved steel box girder br idge design example was originally developed in the nchrp 1238 project using the 1993 aashto gu ide. A box girder also known as tubular girder is a girder that forms an enclosed tube or hollow box like structure with multiple walls. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge.
The following design steps are included in this example. The fhwa posttensioned box girder design manual was developed for engineers who have limited exposure to the design and construction of prestressed concrete bridges. Model of curved concrete box girder bridge methods for adjusting live load support shear for skew described in article 4. Box girder types bridge building bridges of dublin. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Posttensioned box girder bridge an analysis approach using. Plan, elevation and section views are shown on the following pages. Used in cip post tensioned concrete box girder construction, deep bridge. Overview of reinforcedconcrete box girder bridge design capability. Transverse design of adjacent precast prestressed concrete. American and japanese design and detailing practices of prestressed concrete box girder bridges are compared.
This document primarily discusses common steel girder bridge types. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. A design optimization problem for steel box girder sections is formulated and a numerical solution procedure is presented. Apr 22, 2016 steel box girder with graitec advance design america bridge solution, structural analysis and design software. Pgsuper models the various construction stages with construction events. Twin girder composite bridge 60 m 80 m 60 m c0 p1 p2 c3 note. A new precast, prestressed box girder bridge design suitable to u. Box girder bridges from steel box girders and steel and concrete composite box girders are used for long spans, where the self weight of the bridge needs to be minimized, and for situations where their excellent high torsional stiffness is of particular benefit.
Prestressed concrete continuous box girder bridge design. A box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. On the premise that those who ignore history will be condemned to relive it, this paper attempts to document those types of problems that lead to cracking in posttensioned concrete box girder. The cause of cracking in posttensioned concrete box. Many practical examples have been analyzed, and from these results, conclusions valuable to design practice have been deducted.
Twingirder composite bridge 60 m 80 m 60 m c0 p1 p2 c3 note. Beam needs careful design box girder bridges box girder sections oooocheap and cheerful ooooeasy to manufacture not very beautiful girder needs careful design supporting beams to improve the performance of a simple beam bridge the beam has to be supported there are three basic ways to do this. Strutandtie model design example for hammerhead pier. 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.
The west gate bridge is one of a number of box girder bridges built during the mid 20th century, and was one of four to fail in a three year period. Steel box girder with graitec advance design america bridge solution, structural analysis and design software. It can be observed from figure 2a that for the box girder bridge, there are significant differences in deflection and normal stress at the midspan when the brace spacing is reduced from 14 to 6 m. Based on observations made during construction, and on measurements taken of concrete strains, tendon strains, temperature distributions, and slopes, a series of detailed design, construction, and inspectionrelated recommendations are made. Click on a datetime to view the file as it appeared at that time. This document presents guidelines for designing bridges in texas. The design and optimization of segmentally precast. Various studies have been performed so as to develop a more stable structure design by varying the shape of the bridge structure. In this paper, cost optimization approach of a posttensioned pc igirder bridge system is presented. Development of design specifications and commentary for. Design and load rate the first interior girder girder b. Box girder bridge design american institute of steel. These include standard concrete cover and bar spacing dimensions, plus a variety of specific design and detailing instructions. Design calculations will be a reference document during the.
Lin international tyli has announced the completion of the longest box girder span in the world, the 330mspan shibanpo bridge in chongqing, china figs. Lessons learned in the design and erection of box girder. Precast, prestressed girder design example pgsuper training 242020 4. Chapter 1 presents a brief history of the use of the bridge type and describes the basic components of a boxgirder superstructure. New fhwa posttensioned box girder design manual aspire bridge. Determination of load distribution factors of steelconcrete composite box and igirder bridges using 3d finite element analysis. Posttensioned box girder bridge an analysis approach. Steel bridge tutorials computers and structures, inc. Design of prestressed concrete igirder bridge superstructure.
Designed by tyli, the new shibanpo bridge complements the original bridge, constructed in 1981, and will dramatically improve traffic flow across the yangtze river to the. Design examples are presented in appendices to this manual. Hence, a clear understanding of more recent work on straight and curved boxgirder bridges is highly desired. Analysis and design of prestressed box girder bridge by. Bo x girder bridges are being made into use at many places. The application of genetic algorithms gas for a class of numerical examples is investigated. An overview of the design and erection issues is presented, particularly those dealing with thin elements in compression. 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.
This document is disseminated under the sponsorship of the u. Substitution of cip conventional concrete in the contract document with shotcrete requires the. Jiang2 1,2 southern illinois university carbondale, dept. 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. Lrfdbased design optimization of steel box girder sections.
Design of a single cell rcc box girder bridge youtube. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal. Box girder when the area to be spanned exceeds that of existing systems then a new system has to be developed. Example b1 comprehensive example problem description the example problem is a three span continuous box girder bridge that is 700 ft. It is assumed the bridge will be cast on falsework. The national steel bridge alliance has published this document in its continuing effort to enhance stateoftheart steel bridge design and construction. This rating can be done withe csi bridge design 2015,2016, 2017 load combination, seismic and wind. Design guidelines for steel trapezoidal box girder systems 6.
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