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