Behavior of the splice regions of spliced igirder bridges. Precast, prestressed girder design example pgsuper training 242020 1. Design guidelines for steel trapezoidal box girder systems 6. The top and bottom of the i are the flanges and the middle section is the web. Impact of lrfd specifications on design of texas bridges. 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. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Hueste, mohammed safi uddin adil, mohsin adnan, and peter b. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Pdf this research study analyzes the several positions in a box girder bridge. Each pdf opens showing the level of completion that is expected for the sheet the first time it is submitted.
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. Steel girder bridge design plans shall be submitted in phasestwo 2. Prestressed concrete continuous box girder bridge design. Analysis and design of prestressed box girder bridge by irc. The information presented in these examples is meant to convey. Design guidelines for steel trapezoidal box girder systems. The application of spliced girder bridge technology introduces challenges that are not typically encountered in traditional precast girder design and construction. Appendix b example problems transportation research board. If a field splice is required for staged construction on a slabongirder bridge, the support girders should be spaced.
Only the design of slab bridge will be used for illustration. The fhwa posttensioned box girder design manual was developed for engineers who have limited exposure to the design and construction of prestressed concrete bridges. The lateral stability of precast, prestressed concrete bridge girders is an important constructability and safety concern. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Bridges are the key elements in any road network use of box girder is gaining popularity in bridge engineering fraternity because of its better. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrica. The guidance in this publication has been developed from earlier wellestablished guidance in a number of sci bridge design guides.
Measured behavior of a curved precast segmental concrete. It is a companion to a publication giving general guidance on composite highway bridge design. Lrfd bridge design specifications, 4th edition lrfd bridge construction specifications, 2nd edition guide design specifications for bridge temporary works, 2008 interim construction handbook for bridge temporary works, 2008 interim these documents may very well have new information not yet included herein. Twospan continuous straight wideflange beam bridge. Design example for prestressed concrete psc girder. A beginners guide to simple plate girder design to ec3 part 15. 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. 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 first phase is meant to establish type, size and location. It gives two worked examples, one for a multigirder bridge and one for a ladder deck bridge. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes.
Threespan, precast concrete i girder bridge made continuous for live load, 2. This article presents a stateof theart paper on practical seg mental bridge design for ther mal gradient. Design of prestressed concrete igirder bridge superstructure. Design of box girder bridges free download as pdf file.
Each tutorial includes module files and step by step guidelines so you can improve your midas civil skills via completing a small project. Analysis and design of prestressed concrete box girder bridge. Posttensioned box girder bridge an analysis approach using. 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. One of these challenges can arise from the construction sequence that must be carefully considered when designing a spliced girder bridge. Chapter 1 presents a brief history of the use of the bridge type and describes the basic components of a boxgirder superstructure. Rolled beams are shapes produced at the steel mill from solid stock and cut to length to fit the project. Detail analysis 2 fcm bridge 2 unknown load factors 2 steel frame 1 suspension bridge 1 cable force tuning 1 arch bridge 1 heat of hydration 1 pc composite girder 1 plant structure 1 plate design example. Plan, elevation and section views are shown on the following pages.
Lrfd design example for steel girder superstructure bridge. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. Structures design office structures detailing manual examples. Example b1 comprehensive example problem description the example problem is a three span continuous box girder bridge that is 700 ft. The top and bottom of the i are the flanges and the middle section is. Steam cured box beams and cored slabs exhibit lower cambers at the time of prestress transfer than the moist cured members. 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. Aashtolrfd design example horizontally curved steel box girder bridge final report prepared for national cooperative highway research program transportation research board national research council john m. 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. The shapes commonly used by bridge designers are called wsections, which look like an i. Numbering of tables and figures tables and figures shall be numbered using the chapter, section, subsection in which they are located, and then a hyphen followed by consecutive numbers. Threespan continuous curved steel i girder bridge on skewed supports, 4span continuous concrete box. The macros carry out calculations using values from specific cells in the.
Although normally the box girder bridge is a form of beam bridge, box girders may also be used on cablestayed bridges and other forms. Concrete structures chapter 5 wsdot bridge design manual m 2350. Box culvert is a usually default buried structure type that serves a. These include standard concrete cover and bar spacing dimensions, plus a variety of specific design and detailing instructions. Design of reinforced concrete bridges department of civil. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. However, the accuracy of the predictions at later stages is less significantly affected by the curing method and girder type. Pdf advanced calculation methods for box girder bridges.
Design of plate girder design of plate girder design principles design inputs span l, loadings, depth and width internal forces bmd and sfd bending resistance effective width method effective section area, a eff effect second moment of area, i eff elastic modulus w eff m y,rd modifiedflangesonly method. This chapter presents ndot criteria for the design and selection of expansion joints in bridges. In case of doubt, it is best to spell out the word. Design of box girder bridges bending beam structure scribd. 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. In this paper, cost optimization approach of a posttensioned pc igirder bridge system is presented. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. Design to ec3 part 15 nanyang technological university. The box is typically rectangular or trapezoidal in crosssection. Steel bridge tutorials computers and structures, inc. All manual modifications must be approved by the bridge design engineer. Bookmarks are provided in the left panel which allow the user to click on the desired submittal phase to see the appropriate level of completion for the sheet.
Lateral bending failures are sudden, catastrophic, costly, and they pose a serious threat to surroundings and people, including the traveling public during transportation of girders from fabrication facilities to bridge sites. Structures design office structures detailing manual. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Designing precast, prestressed concrete bridge girders for. 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. It is critical that the contract documents include a detailed description of the. Predicting camber, deflection, and prestress losses in. These design and assessment spreadsheets were written using microsoft excel 2000 and 2010 and they contain macros. Box girder bridges are commonly used for highway flyovers and for modern elevated structures of light rail transport. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge. This document consists of a comprehensive design example of a prestressed concrete girder bridge. The proposed design in volves provision of posttensioned.
Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Threespan continuous curved steel igirder bridge on skewed supports, 4span continuous concrete box. Pci bridge design manual 3rd edition, first release. Expansion joints september 2008 191 chapter 19 expansion joints lrfd article 14. Skew bridges should be avoided, as soon as possible in the design scenario. Department, sri vasavi institute of engineering and technology, andhra pradesh.
The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation. These structures detailing manual examples are provided in pdf documents that are structured to illustrate the content that is expected to be seen on each sheet at each level of completion based on the. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. It is assumed the bridge will be cast on falsework. Analysis and design of prestressed box girder bridge by. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. The superstructure consists of two simple spans made continuous for live loads.
Two bridge models example 1 ex1 is a 3span posttensioned castinplace concrete box girder bridge with a midspan of 150 feet and 100 feet on each side span, as shown in figure 1a. Design examples are presented in appendices to this manual. The bridge design manual is a dynamic document, which constantly changes because. Traditional sections such as rectangular box beams, aashto i beams and aashtopci bulbtee sections. In this paper, cost optimization approach of a posttensioned pc i girder bridge system is presented. Design requirements for the network rail standard box girder bridge are given in documents available from network rail. Posttensioned box girder bridge an analysis approach. Structural performance of highway bridges under given. It gives two worked examples, one for a multi girder bridge and one for a ladder deck bridge. Wassef christopher smith kevin johns modjeski and masters, inc.
The shapes commonly used by bridge design ers are called wsections, which look like an i. The design combines the performance require ments for a japanese bridge with the simplicity of american construction practices. Introduction box girders have become a prominent element in the con. Bridge design manual, texas department of transportation august 2001. The substructure consists of integral end abutments and a multicolumn intermediate bent. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m t girder all simply supported. The grandmere bridge, a 285 m 935 ft long castinplace segmental box girder bridge, experienced some distress which required strengthening by adding external prestressing equivalent to 30% of.
Pdf steel or steelconcrete composite box girders are usually. The layout of the spreadsheet should not be changed. Abbreviations should not be used where the meaning may be in doubt. Box girder bridges are commonly used for highway flyovers 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. Two design examples of a simply supported slab bridge and a twospan box girder bridge are also presented. 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. Pdf construction of precast segmental box girder bridge. Transverse design of adjacent precast prestressed concrete. Continuous igirder ncp ex 2 curved steel box girder.
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