Comparison of the amount of reinforcement for a boxgirder. Alberta hollow slab girder width 1206 mm, depth 650 mm void diameter 450 mm span range 16 to 20 m box girders width. 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. Shape of the girder bridge according to the loadings, the road bridges and culverts as irc class a, class aa. Key words steel, box girders, trapezoidal, torsional 18. Sequential placement of the concrete deck is considered. The first concrete bridge constructed by launching was built over the river caroni in venezuela and was completed in 1963 podolny 1982. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Safety, costeffectiveness, and aesthetics are generally the controlling factors in the selection of the proper type of bridges 3. The external prestressing of boxgirder bridges has received increasing attention in recent years, both for new bridges and for the retrofitting of existing bridges 1, 2. A computer spreadsheet application was specifically developed for this investigation. The governing criterion for the use of single box girders on these sites was. Measured behavior of a curved precast segmental concrete. This example illustrates a concrete box girder bridge following horizontal curvature and parabolic slope.
Development of design specifications and commentary for horizontally curved concrete boxgirder bridges explores proposed specifications and examples for the design of horizontally curved concrete boxgirder highway bridges. Particular aspects of composite steelconcrete box girder decks 3. Concrete boxgirder bridge model tutorials computers. Potential lrfd specifications and design examples illustrating the. Free civil engineering magazines and white papers new. The bridge decks have three number tbeams of varying depths depending upon spans.
This document is available to the public through the national technical. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Figure 3 presents fe model 1 which is developed using shell elements both in concrete deck and steel box girder portions. The specific bridge is minneapolis bridge 27b01 for van white memorial boulevard northbound over bnsf railroad tracks north of junction of dunwoody boulevard and i394. The author has heard that it has a reinforced concrete box girder span of 141m. Upgf, updf, upanc, upsh are the unit prices of girder formwork, deck formwork, anchorage set and metal sheath for duct respectively. Balaji rao by ruthvind roy shiva reddy ahad according to the alignment as straight or skew bridges. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. Good bridges are as necessary as good roads for the advancement of a district, and reinforced concrete is an ideal material for a good bridge. 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.
In these cases, straight steel box girders are used in regions where the clear span requirements preclude the use of the concrete ubeams. The slab and the box girder were connected by rigid links because full interaction between slab and steel girder was assumed. Appendix b example problems transportation research board. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Development of design specifications and commentary for.
Construction equipment for concrete box girder bridges. It is capable of analysis, design, and cost evaluation of the superstructure for a castinplace posttensioned box girder bridge. Bridges explores proposed specifications and examples for the design of horizontally curved concrete boxgirder highway bridges. Box girder bridge deck systems free to use bim level 2. 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. A box girder of a viaduct over the ayrton sena highway, in s. Lateral flange moments kft and bracing forces kips due. Optimization of posttensioned box girder bridges with. Prestressed concrete continuous box girder bridge design.
A conventional steel bridge, with composite boxgirder section is given in. 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 box is typically rectangular or trapezoidal in crosssection. The bridge was a posttensioned concrete box girder bridge with a main span of 315 ft. Box shapes 187k, pdf deck bulbtees 164k, pdf double tee bridge beams 157k, pdf next bridge beams 104k, pdf pci zone 6 curved spliced girders 1. Concrete boxgirder bridges explores proposed specifications and examples for the design of horizontally. Construction of precast segmental box girder bridge. The effect of class 70r tracked or wheel load will not be maximum since it is to be placed 1. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. Overview of reinforcedconcrete boxgirder bridgedesign capability. Pci has developed preliminary design charts in accordance with the. Concrete structures chapter 5 wsdot bridge design manual m 2350. For free electronic pdf download on the fhwa infrastructure website. Vgc, vdc, wps, wosd and wosg are the volume of the precast girder concrete and deck slab con.
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 dictate. The tendon profile considered for the design of post tensioned box girder bridge is parabolic and mathematical model is shown in figure 6. The required data includes load information, material properties, bridge geometry, and prestressing data. The substructure consists of integral end abutments and a multicolumn intermediate bent. Design of concrete bridges unms, bratislava, sk eurocode 2 design and detailing rules. We wanted an interior structural steel girder to be placed within the plane of the precast slab units, thereby producing a thin floor construction akin to flatplate with a minimum floor to ceiling height. Comprehensive design example for prestressed concrete. The ministry of shipping and transport roads wing, govt. Web design of box girders concrete bridges sciencedirect. Ctc can also produce box girder sections with winged flanges that extend beyond the box base. Design guidelines for steel trapezoidal box girder systems. German highway administration authorities have even given external prestressing the status of the preferred solution for new concrete boxgirders 1.
Optimal design of a posttensioned box girder is achievable by correct selection of design variables. Analysis and design of prestressed concrete box girder bridge. Department, sri vasavi institute of engineering and technology, andhra pradesh. Box girders of any height, width and wall thickness can be economically fabricated with ctcs standard forms. The behavior of box girder section for a general case of an eccentric load has been studied and presented its. The document also includes instructional commentary based on the aashtolrfd. The superstructure consists of two simple spans made continuous for live loads. Design of a reinforcedconcrete deckgirder highway bridge. Chapter 1 introduction development of design specifications and. Design to ec3 part 15 nanyang technological university. Canadian highway bridge design code, chbdc specifies. Design of plate girder comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. Load distribution in simply supported concrete box girder.
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. Presentation on fhwas posttensioned box girder design manual. Permanent steel deck forms are assumed to be used between the two girders and between the flanges of the individual tubs. Case 1 is just beside the support, case 2 is at midspan and case 3 is an artificial case with too.
It is directed primarily at students and young designers who require understanding of the basic theory and a. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge. Design of reinforced concrete, 10th edition by jack mccormac and russell brown, introduces the fundamentals of reinforced concrete design in a clear and comprehensive manner and grounded in the basic principles of mechanics of solids. For box girders of unusual proportions,t other methods of analysis. High way bridges are of the greatest practical utility and importance, and the number required in the present state of civilization is extremely large. Strength limit state interior girder exterior girder bending moment 0.
Design of prestressed concrete girder bridge request pdf. Design example 312 b s d i structural analysis summary liveload distribution factors. Concrete boxgirder bridge design per aashto lrfd 2007. Pdf in this paper, a box girder bridge, made up of prestressed. Concrete boxgirder bridges ryerson digital repository. Elastic analysis and beam theory may be used in the design of precast segmental box girder structures. 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. Design of concrete structures shall be based on the requirements and guidance cited. Reinforced concrete sections, used in the bridge superstructures, usually consist of slabs, tbeams deck girders, and box girders figure 9.
Tentative design and construction specifications for. Pdf construction of precast segmental box girder bridge. Prestressed tendons system in a box girder bridge 7. This document consists of a comprehensive design example of a prestressed concrete girder bridge. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Deck slabs without transverse posttensioning shall be designed under the applicable provisions of section 5 concrete design. Analysis and design of prestressed box girder bridge by. Referencesbibliography development of design specifications. These include standard concrete cover and bar spacing dimensions, plus a variety of specific design and detailing instructions. Guidelines for design and construction of decked precast, prestressed concrete girder bridges final report prepared for national cooperative highway research program transportation research board national research council r. Pdf the design of posttensioned concrete boxgirders to. 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. The purpose of this book is to provide a straightforward introduction to the principles and methods of design for concrete structures. In the early 1960s, the modern approach to launching concrete bridges was developed.
Ncbc proudly sponsored a presentation by noted bridge engineer and author john corven on fhwas posttensioned box girder design manual. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations. Pdf explicit equations are derived for the the most economic level of prestress, within the full. Study of bridges with composite steelconcrete box girder. Elremaily construction technology laboratories, inc. In addition, the method is used for a comprehensive study of the behavior of these structures with geometrical configurations representing the majority of commonly built box girder bridges. Analysis and design of prestressed box girder bridge by irc. A box girder typically comprises of items such as box girder units, connections and post tensioning cables. Download link from urldecrypt, direct link under maintenance. Concrete box girder bridge, prestress force, eccentricity. Trbs national cooperative highway research program nchrp report 620. Pdf transverse analysis and design of box girder bridge by. Worked examples presented at the workshop bridge design to eurocodes.
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