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. Design and rating for curved steel i and boxgirder bridge structures c. The box girder usually includes either structural steel, prestressed concrete or in the form of reinforced concrete or composite section. Double girder box girder over head cranes are used for heavy duty applications in the industry. The behavior of box girder section for a general case of an.
Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. It is assumed the bridge will be cast on falsework. 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. A design optimization problem for steel box girder sections is formulated and a numerical solution procedure is presented. It gives two worked examples, one for a multi girder bridge and one for a ladder deck bridge. Appendix b example problems transportation research board. Analysis and design of prestressed concrete box girder bridge. Design and rating for curved steel i and box girder. A box girder bridge is an apparent bridge sector in which main beams contain girders in the hollow box shape. Precast is utilized to construct both the superstructure and substructures of all types of bridges. Cantilever construction method is adopted and considered in design box girder bridge using balance cantilever method. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes. 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. Concrete boxgirder bridge design per aashto lrfd 2007.
Investigation into the project revealed numerous issues in the bridge s design and construction. This design example demonstrates the design of a tangent threespan continuous composite tub girder bridge with a span arrangement of 187. 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. The network rail standard box girder type bridge that covers a span range from 21m to 39m uses trapezoidal box girders with a transverse ribbed steel deck spanning between notionally pinjointed shear plate connections. When tension flanges of longitudinal girders are connected together, the resulting structure is called a box girder bridge. Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges. Shape of the girder bridge according to the loadings, the road bridges and culverts as irc class a, class aa. Steel bridge tutorials computers and structures, inc.
Posttensioned box girder bridge an analysis approach. Nhi course 081 load resistance factor design lrfd for highway bridge superstructures, design examples pdf, 7. List of lattice girder bridges in the united kingdom wikipedia. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrica. 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. Lessons learned in the design and erection of box girder. Precast, prestressed girder design example pgsuper training 242020 4. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Box girder bridge design, engineering journal, american institute of steel construction, vol. 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.
Optimization of posttensioned box girder bridges with. These include standard concrete cover and bar spacing dimensions, plus a variety of specific design and detailing instructions. The spreadsheet focus on design of prestressing cable for box girder bridge using balanced cantilever method. Transverse design of adjacent precast prestressed concrete.
Lrfdbased design optimization of steel box girder sections. Mar 19, 2014 click on a datetime to view the file as it appeared at that time. Balaji rao by ruthvind roy shiva reddy ahad according to the alignment as straight or skew bridges. The proposed design in volves provision of posttensioned. An image of a model taken from the sap2000 bridge examples document is shown in figure 1.
Introduction box girders have become a prominent element in the con. Similar composite action may also be achieved in the negative moment region by casting a bottom concrete slab between the points of inflection. The steel box girder may have longitudinal stiffeners on flanges and webs and transverse. 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.
It is capable of analysis, design, and cost evaluation of the superstructure for a castinplace posttensioned box girder bridge. This example illustrates the flexural design of a section in positive flexure, the flexural design of a section in negative flexure, the shear design of the web, the evaluation of. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge. In this paper a detailed parametric design optimization of the main girder of box type is performed. Lrfd design of double composite box girder bridges purvik patel abstract conventional continuous steel bridges only exhibit composite behavior in the positive moment region. Pdf optimization of box type girder of overhead crane. Optimal design of a posttensioned box girder is achievable by correct selection of design variables. Pdf construction of precast segmental box girder bridge. Prestressed concrete continuous box girder bridge design.
Posttensioned box girder bridge an analysis approach using. 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. The design combines the performance require ments for a japanese bridge with the simplicity of american construction practices. This design example was edited in 2012 by hdr engineering, inc. This design is particularly suited to piecemeal crane erection. Chapter 1 presents a brief history of the use of the bridge type and describes the basic components of a box girder superstructure. Design transportation engineering resources bridge design. Effect of transverse stiffene box girder bridge examples in singlecell and doublecell studied by using finite element method of analysis. Design of concrete structures shall be based on the requirements and guidance cited. 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. Design of a single cell rcc box girder bridge youtube. Overview of reinforcedconcrete boxgirder bridgedesign capability. Lrfd steel girder superstructure design example lrfd.
The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Analysis of box girder and truss bridges civil engineering. The steel girder design criteria are obtained from figures 31 through 33 shown below, from the concrete deck design example, and from the referenced articles and tables in the aashto lrfd bridge design specifications through 2002 interims. Example b1 comprehensive example problem description the example problem is a three span continuous box girder bridge that is 700 ft. 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. The formulation is based on the load and resistance factor design lrfd procedure. 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. Using of softwares for the design of bridges is much better than the manual procedure. Manufacturer product data template complete this electronic spreadsheet to ensure that your box girder bridge deck systems product information meets the requirements of level 2 bim.
Pci bridge design manual 3rd edition, first release. A computer spreadsheet application was specifically developed for this investigation. This list is intended to help identify a particular early form of lattice girder bridge which was popular with bridge engineers particularly in the united kingdom in the latter half of the 19th century. 0 specifically, the example illustrates the design of selected critical sections from an exterior girder at the. Lrfd design examples federal highway administration. For this steel girder design example, a plate girder will be designed for an hl93 live load. This is indicative of the lod requirements for box girder bridge deck systems. Design in accordance with the aashto lrfd bridge design specification, eighth edition, 2017 and the wsdot bridge design manual load rate in accordance with aashto, the manual for bridge evaluation, second edition, 2011. The box is typically rectangular or trapezoidal in crosssection. Measured behavior of a curved precast segmental concrete. 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. It is a companion to a publication giving general guidance on composite highway bridge design.
Plan, elevation and section views are shown on the following pages. In this paper, cost optimization approach of a posttensioned pc i girder bridge system is presented. The application of genetic algorithms gas for a class of numerical examples is investigated. Diaphragms in single and doublecell box girder bridges with. Jun 15, 20 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.
The fhwa posttensioned box girder design manual was developed for engineers who have limited exposure to the design and construction of prestressed concrete bridges. Although normally the box girder bridge is a form of beam bridge, box girders may also be used on cablestayed bridges and other forms. So through this project, we are analyzed the structural behavior of post tensioned box girder bridge using the recently developed software called csi bridge version 2015. Threespan continuous straight composite i girder load and resistance factor design third edition customary u.
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. Design of prestressed concrete igirder bridge superstructure. The term lattice girder, is used in the uk and lattice truss is more widely used in the usa. Box girder bridge design american institute of steel. Computerised design of boxgirder bridge using balanced. Analysis and design of prestressed box girder bridge by irc. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Solid diaphragms, and frames of beams introduced at difference cross sections and their effects on behavior of box girder studied and recommendations for bridge design provided. Box girder bridge deck systems bim object definition from nbs. In addition to general design guidance and information on detailing practices, this section contains three design examples. While the design examples consider box girders of constant depth. Analysis and design of post tensioned box girder bridge. Many practical examples have been analyzed, and from these results, conclusions valuable to design practice have been deducted.
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