Section a6 flexural resistance sample calculation from opis to compare with. 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. It gives two worked examples, one for a multigirder bridge and one for a ladder deck bridge. Analysis and design of prestressed concrete igirder bridge. Example b1 comprehensive example problem description the example problem is a three span continuous box girder bridge that is 700 ft.
Transverse design of adjacent precast prestressed concrete box. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. 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. For a particular girder span and bridge width, a large number of parameters control the design of the bridge such as girder spacing, cross sectional dimensions of girder, deck slab thickness, number of strands per tendon, number of tendons, deck slab reinforcement, configuration of tendons, anchorage system, prestress losses, concrete. Department, sri vasavi institute of engineering and technology, andhra pradesh. Lrfd example 1 1span cipptcbgb 1span castinplace cast. Bridge design bridge design and assessment bridge components. 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. Pdf analysis and design of prestressed concrete box. The document also includes instructional commentary based on the aashtolrfd. Analysis and design of prestressed concrete box girder 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. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4.
The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci. Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. China electric power press continuous prestressed concrete box girder bridge design case study. Optimization of posttensioned box girder bridges with. This publication presents worked examples of the detailed design of two composite highway bridges. Concrete structures a beginners guide to simple plate girder design to ec3 part 15. This document consists of a comprehensive design example of a prestressed concrete girder bridge.
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. Design of deck reinforcement, including flexural resistance, limits of reinforcement, and control of cracking is based on aashto lrfd bridge design specifications 5. Design, detailing, and testing of non posttensioned transverse connections in adjacent boxgirder bridges. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. Posttensioned box girder bridge an analysis approach using. 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. 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. Introduction this example illustrates new mexico department of transportation nmdot design procedures for a threespan prestressed concrete girder bridge.
Construction of box girder bridges specifications, uses. Section properties of composite bridge beams to bs 5400 pt. The examples cover the principal steps in the verification of the. 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. Introduction this example is part of a series of design examples sponsored by the federal highway administration. Pdf this research study analyzes the several positions in a box girder bridge. Twospan castinplace posttensioned concrete box girder bridge. This document includes detailed flowcharts outlining the design steps for all components of. Based on observations made during construction, and. This example illustrates the design of a two span castinplace post tensioned concrete box girder bridge. Standard adot 32inch fshape barriers will be used resulting in a bridge configuration of 15 barrier, 120 outside. Bridge detail sheets document library bridge design. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. The lateral stability of precast, prestressed concrete bridge girders is an important constructability and safety concern.
Another method of box girder bridge construction is the incremental launching. A twospan bridge example is used here to illustrate the design steps in detail. Concrete structures chapter 5 wsdot bridge design manual m 2350. 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 addition, current prestress loss predictions used by ncdot are based on the 2004 aashto lrfd bridge design specification, which has been superseded by the 2010 edition. The substructure consists of integral end abutments and a multicolumn intermediate bent. Box culvert is a usually default buried structure type that serves a. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. Based on observations made during construction, and on measurements taken of concrete strains. This website and documents are provided for use by persons outside of the kansas department of transportation as information only. Impact of lrfd specifications on design of texas bridges. Design guidelines for steel trapezoidal box girder systems. Bridge detail sheets are backed by engineering analysis, calculations, crash testing and are approved by nhdot administrators and the federal highway administrration fhwa. Elevation, plan and typical cross section of precast box girder bridges in the united states.
It is a companion to a publication giving general guidance on composite highway bridge 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. It may also be prefabricated in a fabrication yard, then transported and installed using cranes. Key words steel, box girders, trapezoidal, torsional 18. Design of reinforced concrete bridges department of civil. Design example 37 b s d i lrfd negative moment loading article 3. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge. Measured behavior of a curved precast segmental concrete. It is capable of analysis, design, and cost evaluation of the superstructure for a castinplace posttensioned box girder bridge. Two design examples of a simply supported slab bridge and a twospan box girder bridge are also presented. This report documents observations and measurements made during the construction of balanced cantilevering of a fivespan, continuous segmental concrete, curved boxgirder bridge. Each tutorial includes module files and step by step guidelines so you can improve your midas civil skills via completing a small project. An image of a model taken from the sap2000 bridge examples document is shown in figure 1.
Prestressed concrete continuous box girder bridge design. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. The design specifications used in these examples is the aashto lrfd bridge design specifications. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Concrete boxgirder bridge design per aashto lrfd 2007. Two spreadsheets for determining the elastic and plastic section properties of a composite beam comprising a steel plate girder with unstiffened flanges and a reinforced concrete deck for internal and edge beams.
Pdf precast prestressed concrete adjacent box girder bridges are widely used in short and medium span bridges. It is assumed the bridge will be cast on falsework. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Chain link railing type 7 mod pcps concrete girder bulb tee mod california st70 mod bridge rail. Designing precast, prestressed concrete bridge girders for.
The purpose of this document is to illustrate how the pgsuper computer program performs its computations. The first example is of multi girder form, the second is of ladderdeck form. The following design method can be used for normal weight concrete with specified compressive strengths up to 15. This example illustrates the design of a two span castinplace posttensioned concrete box girder bridge. Structures design office structures detailing manual. The upper lefthand box in this screen contains a list of all aashto lrfd loads.
Plan, elevation and section views are shown on the following pages. Optimal design of a posttensioned box girder is achievable by correct selection of design variables. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. Others who use the nhdot documents do so at their own risk. Comprehensive design example for prestressed concrete girder. It gives two worked examples, one for a multi girder bridge and one for a ladder deck bridge. Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18. Pdf construction of precast segmental box girder bridge.
Continuous igirder ncp ex 2 curved steel box girder. Box girder bridges may be cast in place using falsework supports, removed after completion, or in sections in case of a segmental bridge. 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. The kansas department of transportation, the state of kansas, nor its officers or employees, by making this website and documents available for use.
This article presents a stateof theart paper on practical seg mental bridge design for ther mal gradient. This example illustrates the design of a single span castcastinplace posttensioned concrete box girder bridge. Bridge design manual, texas department of transportation august 2001. Rolling vehicle load as per irc 70r loading diagram of 28m psc beam bridge 7. In these cases, straight steel box girders are used in regions where the clear span requirements preclude the use of the concrete ubeams. Elremaily construction technology laboratories, inc.
The box girder normally comprises of prestressed concrete, structural steel or steel r. A pdf document of the design notes section contained on this website. Design of prestressed concrete igirder bridge superstructure. 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. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Retaining wall and castinplace box culvert concrete strength f. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. Continuous prestressed concrete girder bridges volume 1. Design to ec3 part 15 nanyang technological university. The first report summarized an exploratory investigation of the shear transfer between joints using details commonly found in segmental box girder construction. The first reinforced concrete design manual formerly titled aci design handbook was developed in.
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. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal. Predicting camber, deflection, and prestress losses in. The bridge design manual is a dynamic document, which constantly changes. Appendix b example problems transportation research board. Starting with this, technical papers, reports, and books were published in the. 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. The box is typically rectangular or trapezoidal in crosssection.
Analysis and design of prestressed box girder bridge by. A computer spreadsheet application was specifically developed for this investigation. Analysis and design of prestressed box girder bridge by irc. In addition to explaining the design steps of the design example, the comprehensive commentary goes beyond the specifics of the design example to offer guidance on different situations that may be encountered in other bridges. Only the design of slab bridge will be used for illustration. Prestressed concrete decks are commonly used for bridges with spans between 25m and 450m and provide economic, durable and aesthetic solutions in most situations where bridges are needed. The document contains notes regarding the choice of abutment, choice of bearings, preliminary design, reinforced concrete decks, prestressed concrete decks, composite decks, steel box girders, steel truss decks, cable stayed decks, suspension. The kansas department of transportation, the state of kansas, nor its officers or employees, by making this website and documents available for use by persons outside of kdot, does not undertake any duties or responsibilities of any such person or. Lifecycle cost many factors affect the life of a bridge beyond whether or not the superstructure is comprised of steel or concretesuch as design, type and frequency of traffic, environment, weather, maintenance and changes in usage and conditions over time. These modified items may include barriers, girder types, or any other nonstandard item. Overview of reinforcedconcrete boxgirder bridgedesign capability.
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. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. The superstructure consists of two simple spans made continuous for live loads. To provide an erection method being suitable for, in particular, erection of a prestressed concrete box girder bridge using a corrugated steel plate web. The bridge has a 160 feet span with a 15 degree skew. Review of design procedures for shear and torsion in. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Precast, prestressed girder design example pgsuper training 242020 1. Comprehensive design example for prestressed concrete. 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.
The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Concrete boxgirder bridge model tutorials computers. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes. It is a companion to a publication giving general guidance on. Pdf design, detailing, and testing of nonposttensioned transverse. Key words bridge design, prestressed concrete, load and resistance factor design, lrfd, concrete deck, intermediate. Concrete bridge lrfd specifications parsons brinckerhoff page 1 1. These documents are prepared by the nhdot for use on nhdot projects. Self weight load diagram of 28m t beam bridge figure 3. Concrete boxgirder bridge model tutorials computers and. Design example for prestressed concrete psc girder. Reinforcing members 21, 22 are attached to a bridge axis orthogonal plane of the corrugated steel plate web 11 and are mutually connected by length of erection in the direction of bridge axis to.