Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary. This design example was not intended to follow the design and detailing practices of any. It was found that a certain amount of poor design was prevalent, and the. Mec engineers calculation for prestressed kern positions. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Bridge manual standard drawings wisconsin department of. Concrete remains the most common material for bridge construction around the world, and prestressed concrete is frequently the material of choice. Pdf structural bridge design chapter 7example of prestressed. Design of prestressed concrete girder bridges using. Since this example is presented in a mathcad document, a user can alter assumptions. A slab strip of unit width is analysed using simple beam theory.
Design of concrete structures shall be based on the requirements and guidance cited herein and in the current aashto lrfd bridge design specifications lrfd, aashto. Additionally, the virtisopis file used for rating the bridge is to be sent to the nmdot bridge design bureau. Theory and design of prestressed concrete ce 522 final exam, december 9, 2002 open book, open notes a concrete frame consists of a prestressed beam and column, both pretensioned, as shown. Comprehensive design example for prestressed concrete psc. Design example for prestressed concrete psc girder superstructure bridge with commentary. In prestressed concrete, a prestress force is applied to a concrete member and this induces an axial compression that counteracts all, or part of, the tensile stresses set up in the member by applied loading. The washington state department of transportation wsdot makes these documents available on an as is basis. 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.
Concrete bridge lrfd specifications parsons brinckerhoff page 1 1. The principles of prestressed concrete are explained by following stepbystep the preliminary design of a simple beam and a continuous beam. The big sandy river bridges in tennessee were built in 196364. Comprehensive design example for prestressed concrete girder. Prestressed concrete bridge beams typically use 15. Posttensioned box girder bridge an analysis approach.
This bridge design manual was prepared by siteblauvelt engineers, inc. Evaluation of prestressed concrete bridges under light. Prestressed concrete is basically concrete in which internal stress of a suitable magnitude and distribution are deliberately introduced so that the stresses resulting from external loads are counter acted in a desired degree for example lets try. Although the responsibility for prestressing lies with the contractor, it is important that the resident engineer and the. Take advantages of the capabilities of to todays spreadsheet specifically ms excel 20 spreadsheet in the design of post tension prestressed concrete. Leap bridge concrete is design and analysis software for concrete bridges of all types. Prestressed concrete seminar report, ppt, pdf for civil. While pretensioned concrete uses tendons directly bonded to the concrete, posttensioned concrete can use either bonded or unbonded tendons. Comprehensive design example for prestressed concrete psc november 2003. Prestressed concrete refers to concrete that has applied stresses induced into the member. Introduction this example illustrates new mexico department of transportation nmdot design procedures for a threespan prestressed concrete girder bridge. If you continue to use the site without changing your cookie settings, we assume you are fine with our cookies and the way we use them. 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.
Bridge design manual wv department of transportation. Lrfd design manual georgia department of transportation. Aug 08, 2017 this document consists of a comprehensive design example of a prestressed concrete girder bridge. The first goal was accomplished by development of guidelines. Examples of bridges of this type built by the states of tennessee and california are presented in figs. Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary task order dtfh6102t63032 us customary units submitted to the federal highway administration prepared by modjeski and masters, inc. Deck design follows the nmdot standard deck slab detail in chapter 4 of the nmdot bridge procedures and design guide, hereinafter referred to as design guide. Pdf on apr 16, 2017, nabeel albayati and others published structural bridge design chapter 7example of prestressed concrete. P initial prestressing force after all losses kips 1,096 kips see design step 5. Spreadsheet application for prestressed concrete bridge. Aug 06, 2015 in prestressed concrete, a prestress force is applied to a concrete member and this induces an axial compression that counteracts all, or part of, the tensile stresses set up in the member by applied loading. Precast, prestressed girder design example pgsuper training 242020 1. Lengths range from 30m to 60m containing all necessary details required in a prestressed bridge design drawings. The intent was to have sample design calculations that could be used in conjunction with the abc standard concepts so that the practitioner will get a comprehensive view of how abc designs are performed and.
The sample design calculations pertain to the same standard bridge configurations for steel and concrete used in the abc standard concepts. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. 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 involved in concrete. Design of prestressed concrete beams is based upon two distinct concepts which lead to two design methods known as service load design or working stress design, and ultimate design. The design of prestressed concrete bridges concepts and principles. Pdf design procedure for prestressed concrete beams. This document provides guidance for the design of a precast, prestressed beam bridge utilizing the aashto lrfd bridge design specifications. We use cookies to provide you with the best possible user experience. Wisconsin department of transportation bridge manual. This document consists of a comprehensive design example of a prestressed concrete girder bridge. In this project work the prestressed concrete girder bridge, already constructed near islamabad on motorway, is selected for analysis and design work with slight variation in data. Continuous highway bridges with precast, prestressed girders have been built by a number of states. Typically, wires or tendons are stretched and then blocked at the ends creating compressive stresses throughout the members entire crosssection.
The prestressed concrete beam, s an element in a structural system, is one member which requires such calculations. The example includes the following component designs. Structures design office lrfd design examples files pdfs. Sep 05, 20 fundamentals of prestressed concrete bridge with solved example introduction. View initial results incanvas or purchase detailed girder design documentation in pdf format using cloud credits this will also generate a model that can be opened in autodesk structural bridge design. A complete design example illustrates these considerations following a general discussion of the principles. Calculate the nominal moment strength of the prestressed member shown. Design of prestressed concrete igirder bridge superstructure. Optimization of bridge structures is not attempted extensively because of complexities such as a large number of variables, discrete values of variables, and difficulties in formulation. This manual is intended to be a guide for engineers working on bridge design projects for the wvdoh.
Browse our calculation section and see typical statistical calculations. Lrfd design example prestressed precast concrete beam. Appendix c prestressed concrete bridge design example task order dtfh6102t63032 c2 vs b volume to surface ratio for the beam beam surface area is 2,955. 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 involved in concrete design. Design of prestressed concrete quiz and interview questions. The design of prestressed concrete bridges concepts and. Design of reinforced concrete bridges department of civil.
Design procedure for prestressed concrete beams fig. Concrete bridge design, analysis software leap bridge concrete. Background of prestressed concrete bridges a total of four constructed bridges in denver, co, are moni tored. A practical approach to the optimal design of precast, prestressed concrete highway bridge girder system was presented by lounis and cohn, 1993. To achieve continuity in a bridge using precast, prestressed single span units requires design considerations that also include the effects of creep and shrinkage. The design steps for a posttensioned composite bridge girder were prepared with the help of several sample design calculation demonstrated in different pc structure design books and seminar papers.
Bridge design, prestressed concrete, load and resistance this report is available to the public from the. This type of bridge provides benefits of rapid construction, and improved structural performance. Home bridge design prestress kerns prestressed kerns positions in design of prestressed concrete, locating the correct kern positions, top and bottom of a section, are very important calculations because it will determine the best tendon cable profile positions. Concrete bridge drawing bridge engineering drawing.
Aashto lrfd bridge design specifications, 5th edition, 2010. In the field of bridge engineering, the introduction of prestressed concrete has aided the construction of longspan concrete bridges. Concrete is normal weight with a compressive strength of 5 ksi. Comparison between a conventional design process and b optimum design process.
Develop a design aid that can be used for classroom instructions. Among bridges, the pamban road bridge at rameshwaram, tamil nadu. The superstructure consists of two simple spans made continuous for live loads. In addition to general design guidance and information on detailing practices, this section contains three design examples. Flexural resistance sample calculation from opis to compare with. Six different detailed bridge design in word documents of reinforced concrete bridges. Concrete bridge design, analysis software leap bridge. When zd is determined, the prestressing force required to balance an. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal. Design of posttensioned prestressed concrete beam using excel spreadsheet with visual basic applications 11 5. Sep 25, 2017 this document provides guidance for the design of a precast, prestressed beam bridge utilizing the aashto lrfd bridge design specifications. Structures design office lrfd design examples files pdfs fdot. In service load design the stresses in the beam are calculated on the basis of the.
It has been done in accordance with aashto lrfd bridge design specifications. As a part of this study, a computer program to perform the necessary calculations for the design of simple span ishaped beams of pretensioned prestressed concrete for use in highway and railroad. Fundamentals of prestressed concrete bridge with solved example introduction. Calculate stress in prestressed reinforcement at nominal strength using approximate value for fps. In the field of bridge engineering, the introduction of prestressed concrete has aided the construction.
Also explore the seminar topics paper on prestressed concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2015 2016. The research was performed to develop guidelines for design and construction and to address issues that significantly influence performance. Design of prestressed concrete structures pdf tendons may be located either within the concrete volume internal prestressing or wholly outside of it external prestressing. Oneway slabs normally design as a beam with cables running in the direction of the span at uniform centres. Please send constructive comments to the bridge design lrfd committee care of. By 1982, the sunshine skyway bridge in tampa, florida, had set a new record for concrete bridges, with a.
View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples. Girder analysis and design is performed using the computer. To design prestressed girders using line girder analysis. Explore prestressed concrete with free download of seminar report and ppt in pdf and doc format. In the field of bridge engineering, the introduction of prestressed concrete has aided the construction of. This download combined various composite posttensioned bridge beams. Fundamentals of prestressed concrete bridge with solved. Sample final exam solution on prestressed concrete design. Late in the 1970s, cablestayed construction raised the bar for concrete bridges. Pdf design and detailing of presstressed concrete bridge. You will never need to buy another book on this subject, especially since a majority of those offered in the market only cover the basic aspects of prestressed concrete. Comprehensive design example for prestressed concrete. Design of prestressed concrete girder bridge request pdf.
All strands are grade 270 ksi stressrelieved sevenwire with an initial prestress of 189 ksi, a yield stress of 230 ksi, an elastic modulus. 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. The superstructure design includes the following elements. It provides policies, procedures and methods for developing and documenting the design process. This approach aims at standardizing the optimal design of bridge systems, as apposed to standardizing girder sections. In any span, the max cable sag, zd depends on the concrete cover requirements and the tendon dimensions. Appendix c prestressed concrete bridge design example task order dtfh6102t63032 c4 where.