Structural systems and dimensions pdf montana department of transportation. Analysis and design of prestressed box girder bridge by irc. Analysis and design of prestressed box girder bridge by. Effective bracing of steel bridge girders outline stability bracing of i. See miscellaneous standards section in the list for all additional standard drawings required. The research was performed to develop guidelines for design and construction and to address issues that significantly influence performance.
In the present study a cost optimum design approach of a simply supported posttensioned pc i girder bridge system is presented considering the cost of materials, labor, fabrication and installation. Girder bridges are the most natural and simplest form of bridging between two points. Play with your real life partner, or find a partner online. The bridge system consists of precast girders with castin situ reinforced concrete. The connected elements typically straight may be stressed from tension, compression, or sometimes both in response to dynamic loads.
Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Thedifficultyoferectingaplate girder bridgeob viouslyincreaseswith thespan, and inthis discussion the methodsused in variousbridges willbe described inthe order. Optimization of precast prestressed concrete bridge girder. Collins professor department of civil engineering university of toronto. To display the strand details inside the base file, open the reference file dialog box and activate the display option of the file with the description that. Optimization of precast prestressed concrete bridge girder systems z. Structural reliability of prestressed uhpc flexure models. The entire bridge deck, including the swing bridge, is made of prestressed concrete. These are included in our issued set of prestressed concrete i girder standards. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal perpendicular alignment.
This includes the girders themselves, diaphragms or crossbraces, and if applicable the truss or arch system. Prestressed concrete bridge an overview sciencedirect. Manual for repair and retrofit of fatigue cracks in steel bridges. In its simplest form, a log across a creek is an example of a girder bridge. When you select a bridge in a model or proposal and start line girder analysis, infraworks will validate the initial rulesbased layout of your bridge girders and compare your designs against bridge design standards that you can choose from. Improving predictions for camber in precast, prestressed concrete bridge girders by michael a. The parametric design study indicated that for bridges spanning from 150300 ft, continuous precast, prestressed concrete girder bridges with inspan splices can provide an economical alternative to steel girder bridges and segmental concrete box girder construction. Pdf continuous prestressed concrete girder bridges. Pdf new precast bridge girder with combined prestressing. In the construction of continuous deck bridges, it is essential to extend prestressing cables as the construction proceeds. Structural reliability of prestressed uhpc flexure models for bridge girders article in journal of bridge engineering 151 january 2010 with 80 reads how we measure reads. The girder is to be strengthened due to section loss from corrosion. Anchorage zone design for pretensioned precast bulbt bridge girders in virginia eric d.
Chapter 14 prestressed concrete girders department of transport. Design of continuous highway bridges with precast, prestressed concrete girders clifford l. A few studies on curved, posttensioned concrete girder bridges have been published. Bridge impact data nebraska 800 overhead bridges 10 impacts in past year united states 91,000 overhead bridges approx. A parametric study for aashto type iv, type c, and texas u54 girders was conducted using span length, girder spacing, and. Both singlecell and multicell box girders are discussed. The use of girder as a natural bridging element is abundantly evident in nature, such as a fallen tree trunk over a stream or rock. Shear capacity of prestressed concrete bridge girders. Chances are very high that today, a bridge engineer will learn how to design a bridge girder before any other bridge type. After reading this article you will learn about the design of slab and girder bridges. Types of bridges bridge types arch, girder, cable, truss.
University of pittsburgh, 2009 it is common practice that aging and structurally damaged prestressed concrete bridge members are taken out of service and replaced. In a girder bridge this would include only the girders and the bracing system. Precast construction offers many options for bridge owners and designers. Past manual notices are available in a pdf archive. This document is a standard developed by the aashtonsba steel bridge. It is the main horizontal support of a structure which supports smaller beams. Sweep in precast, prestressed concrete bridge girders.
Precast prestressed concrete igirder bridges have become the most dominate bridge. Sweep in precast, prestressed concrete bridge girderspart ii. Selfcompacting concrete scc for prestressed bridge girders 7. Analysis and design of prestressed concrete box girder bridge. A girder bridge is a bridge that uses girders as the means of supporting its deck. A girder bridge is a basic, common type of bridge where the bridge deck is. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. The common slovak precast girders are produced to the34 m length as one element. Examples of bridges of this type built by the states of tennessee and. The tested splice connections performed well under service level loads. For purposes of illustration, let us compute the sweep as if all strands in the girder were located.
The figures on pages 5 and 6 show the elevation and typical. Girders often have an ibeam cross section composed of two loadbearing. The girders are the primary load support, while the bracing system both allows the girders to act together as a unit, and prevents the beams from toppling. Bridge design guide the texas department of transportation ftp.
Impact of lrfd specifications on design of texas bridges. This type of bridge provides benefits of rapid construction, and improved structural performance. Freyermuth design research section portland cement association skokie, illinois continuous highway bridges with precast, prestressed girders have been built by a number of states. Summary the process for assessing the condition of a bridge involves continuously monitoring changes to the material properties, support. This example is based on aashto lrfd bridge design specifications, 7th edition.
The first article focused on potential causes of sweep and provided recommendations for actions that can be taken at the. The basic types of truss bridges shown in this article have simple designs which could be easily analyzed by. Curved, precast, pretensioned concrete igirder bridges. The durability, cost effectiveness and low maintenance of precast concrete, have made it the dominant structural material for short to mediumspan bridges. Except for nu girders the standard drawings consists of one base file containing girder details used in most designs and one reference file containing strand details that vary by design. Cloud credits are charged only for the full girder design documentation provided in pdf format. Girder is a term used in construction to refer to a supporting, horizontal beam that can be made from a variety of construction materials such as stainless steel, concrete, or a combination of these materials. Improving predictions for camber in precast, prestressed. Traditional solutions are i girders, slab girders and box girders with traditional i girders being replaced by a new family of more efficient bulb t girders with depths ranging from 1200 to over 2400 mm. The main bridge was built by incremental launching, with a unit length of 15. This, however, is not an efficient use of materials.
Detecting structural damage to bridge girders using radar. The first goal was accomplished by development of guidelines. Shear capacity of prestressed concrete bridge girders what was the need. Debonded strands in prestressed concrete bridge girders mndot. County materials concrete products serve as integral components for bridge and tunnel applications for highways, railroads, airports and special projects. Txdot is interested in developing additional economical design alternatives for longer span bridges, through the use of the continuous precast, pretensioned concrete bridge structures that use spliced girder technology. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. On bridges with a horizontal curve, the outer flange of the outer girders, are to be curved to match the road alignment.
Structural repair of prestressed concrete bridge girders jarret lee kasan, m. Department of civil engineering university of minnesota. Eberhard bridge engineer professor professor department of civil and environmental engineering university of washington, box 352700 seattle, washington 98195 washington state transportation center trac. Curved, pretensioned concrete girder bridges have not. The design criteria is to strengthen the girder to obtain a hs20 live load rating factor equal to or greater than 1. 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. Bridge girders part ii this article is the second in a series of three articles on sweep, or bowing, in prestressed concrete bridge girders. Viaduct, pueblo, co rosebankpatiki interchange, nz palm valley bridge, fl moore haven bridge, fl route 33 bridges, west point, va. Precast, prestressed girder design example pgsuper training 242020 1.
Prestressed concrete igirder psi missouri department. Specification 1041 i erection of precast prestressed. The texas department of transportation txdot is currently designing typical highway bridge structures as simply supported using standard precast, pretensioned girders. Girder bridges arch bridges cablestayed bridges rigid frame bridges truss bridges. A truss bridge is a bridge whose loadbearing superstructure is composed of a truss, a structure of connected elements usually forming triangular units. Guide to recommended practice for the repair of impactdamaged prestressed concrete bridge girders prepared for the national cooperative highway research program transportation research board of the national academies kent a. Selfcompacting concrete scc for prestressed bridge girders. Our prestress facilities specialize in manufacturing longlasting, reliable. During manufacture, tension applied to the steel reinforcement rods that run the length of the girder is transferred into compression of the concrete as it cures, resulting in a much. Offsystem 24ft rdwy bridge standards available for download prestressed i girder standards are available for structures with type tx28 thru tx62 girders. Spread slab beams, steel plate girders, and steel tub girders.
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