Prestressed concrete girders drafting and design presentation standards manual, transport and main roads, march 2018 1. Aashto guide specifications for horizontally curved steel. Therefore, the purpose of this paper is to present information relative to the design criteria in addition to information on pre liminary plate sizes, design aids, and computeraided design of steel box girder bridges. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. Construction and load tests of a segmental precast box. A twospan bridge example is used here to illustrate the design steps in detail. Precast, prestressed girder design example pgsuper training 242020 1. New fhwa posttensioned box girder design manual by reggie holt, federal highway administration, and john corven, corven engineering figure 2. Practical steel tub girder design april 2005 authors domenic coletti, p. A typical example is, because of a previously determined large span between columns, to use higher concrete class in the design of columns, while following the uls and sls criterias, defined with. Design guidelines for steel trapezoidal box girder systems 6. Design to ec3 part 15 nanyang technological university. Lrfd steel girder superstructure design example lrfd.
For example, the development of postbuckling action in a web plate, assumed in the previous lectures, can only occur when the elements at the boundary of that web plate are able to provide an adequate anchorage for the. Steel girder design example using 3rd edition aashto lrfd. Requirements for special moment frame continuity sec. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer.
Chapter 407 s tructural s teel this chapter addresses structuralsteel requirements in the lrfd bridge design specifications, hereafter referred to as lrfd, which may require amplification, clarification, or an improved application. Structural steel design, fabrication, and construction. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. The purpose of this example is to illustrate the use of the aashto lrfd bridge design for the design of a continuous two span steel igirder bridge. Impact of lrfd specifications on design of texas bridges. Texas department of transportation walter gatti tensor engineering john holt, p. Design of plate girder design of plate girder design principles design inputs span l, loadings, depth and width internal forces bmd and sfd bending resistance effective width method effective section area, a eff effect second moment of area, i eff elastic modulus w eff m y,rd modifiedflangesonly method. The files attached include a csibridge model and a detailed pdf which documents the modeling and verification procedures for a composite steel girder bridge design based on the example published in the lrfd design example for steel girder superstructure bridge fhwa nhi04041 by fhwa in november 2003 recommended reading.
The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Crane girder design crane girder details proper detailing is the key to good fatigue performance the vast majority of crane girder performance issues occur at the crane girder to column connection. Expedite and economize the design process simple repetitive details and member sizes bridge parameters span lengths. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Analysis and design of prestressed box girder bridge by irc. Chapter 15 structural design requirements for designbuild. Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18. Structures design office structures detailing manual examples. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. This example illustrates the flexural design of a section in positive flexure, the flexural design of a section in negative flexure, the shear design of the web, the evaluation of. New window will appear, fill the data as shown below. Design verifications for simple steel plate girder bridges, consider spot checking computer program design and analysis output by rough hand calculations if practical for complicated steel plate girder bridges curved, consider verifying design with a second design analysis program no two programs will match exactly of course.
This bar will contribute to the overall resistance and will be accounted for in the calculations below. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. Design guidelines for steel trapezoidal box girder systems. Steel tutorial stl1 simple span plate girder example. Department, sri vasavi institute of engineering and technology, andhra pradesh. Formula 5 may seem too complicated for design purposes. Step 2 retrieve interior girder sgl predictions for dead load deflection along the span, 110 or 120 points.
About this design example description this document provides guidance for the design of cfcc prestressed precast concrete beams according to aash to lrfd bridge design specifications with the neccessary ammendmets where applicable, based on av ailable literature and ex perimental data from tests conducted by grace et. Appendix i design example integral steel boxbeam pier. 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 tributary area for a girder truss is half the sum of all the tributary areas of the supported trusses plus half the area to the next truss. From girder end midspan of noncomposite beam girder top stress. Bibm and ermco are delighted to make these authoritative documents available to design engineers, software developers and all others with an interest. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. In addition, a design example for a twospan plate girder superstructure is included. You can easily design any plate girder on the basis of these steps with a simple process of design by following our given steps in the pdf file provided below. Pti 32 numerical example key concepts secondary moments equivalent loads tensile stress computation 1 4 4 23 11. Zahn what differentiates a beam from a plate girder. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. As the name suggests this design plate girder spreadsheet can design plate girders. These structures detailing manual examples are provided in pdf documents.
Lrfd design example for steel girder superstructure bridge fhwa. Concrete box and prestressed concrete tubgirders see section 5. Load balancing is used, a portion of the load on slab is balanced by the transverse forces imposed by the draped tendons in each direction. Extend bearing stiffeners the full height of the girder. For this steel girder design example, a plate girder will be designed for an hl93 live load. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem.
However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. Only the design of slab bridge will be used for illustration. Since revisions or additions to the design file drawings may occur at any time, the. Structures design office lrfd design examples files pdfs fdot. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Diaphragms crossframes through girders the beam or girder is fully braced at a location if twist is prevented. 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. It is intended to supplement the requirements of the bridge structures design criteria bsdc. Design considerations for steel plate girder bridges. Structures design office lrfd design examples files pdfs. 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. For this design example, a conventional line girder analysis program was used to determine dead load forces and reactions.
Four span simply supported steel plate girder input. The first example is of multigirder form, the second is of ladderdeck form. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. To design prestressed girders using line girder analysis. The design examples provide coverage of all applicable limit states, whether or not a particular limit state controls the design of the member or connection.
American association of state highway and transportation officials. Simplified optimum design of plate girder according to the obtained results, a design method is sugg ested to design optimally a plate girder for specified load, span, and to tal girder depth. Sep 25, 20 the files attached include a csibridge model and a detailed pdf which documents the modeling and verification procedures for a composite steelgirder bridge design based on the example published in the lrfd design example for steel girder superstructure bridge fhwa nhi04041 by fhwa in november 2003. A beginners guide to simple plate girder design to ec3 part 15. The nu girder bridge design and detailing manual documents current best practices for nu girder bridge designs in alberta. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. This document is disseminated under the sponsorship of the u. Precast, prestressed girder design example pgsuper training 242020. Twospan december 2015 continuous straight composite steel i girder bridge 6. Moment frame assigned to seismic design category d, e, or f.
Structures design office structures detailing manual. This publication offers a general overview of the design of steel framed buildings to the structural eurocodes and includes a set of worked examples. Nu girder bridge design and detailing manual open government. The manual focuses on the design and detailing of nu girder bridges. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions. General after making an initial selection of the slab thickness, the second step in slab design is to determine the amount and distribution of prestress. For this example we will assume an interior girder deflection of 6 and an exterior girder deflection of 5. For a complete glossary of terms refer chapter 1 introduction.
Comprehensive design example for prestressed concrete girder. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Aashtolrfd design example horizontally curved steel box girder bridge final report prepared for national cooperative highway research program transportation research board national research council john m. Preferred practices for steel bridge design, fabrication, and. Dc1 loads applied to the noncomposite steel sec tion and dc2 and dw loads applied to the longterm composite 3n 24 section. Characteristics design of gantry girder is a classic example of laterally unsupported beam. Continental steel public seminar, 6 august 2014, ntu design of plate girder design of plate girder shear resistance if the web is stocky, no shear buckling of web shall occur and the shear strength of the web is given by ec3 part 11 if the web is not stocky, shear buckling governs the failure.
The purpose of this document is to illustrate how the pgsuper computer program. Creating a new bridge file to create a new bridge right click on the folder where you want to save the bridge and choose new new bridge. Structural steel 1 of 18 rev plate girder design project. Analysis and design of composite steelgirder bridge. Texas department of transportation the national steel bridge alliance has published this document in. Developed by corven engineering for the federal highway administration. Lrfd design example for steel girder superstructure bridge.
This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design. Design of prestressed concrete igirder bridge superstructure. 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. 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. Appendix b example problems transportation research board.
Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. 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 committee 340, design. Plate girders are most widely use steel structural elements after rolled section. Part i includes design guidelines, plates, and administrative procedures intended to promote consistency and. The general basis of plate girder design is discussed in a simplified way as a prelude to a more detailed presentation in lectures 8. This publication presents worked examples of the detailed design of two composite highway bridges. This design example demonstrates the design of a tangent threespan continuous composite tub girder bridge with a span arrangement of 187.
The steel girder design criteria are obtained from figures 31 through 33 shown below, from the concrete deck design example, and from the referenced articles and tables in the aashto lrfd bridge design specifications through 2002 interims. The examples cover the principal steps in the verification of the. This document provides guidance for the design of a precast, prestressed beam bridge utilizing the. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Tensioning building structures march 12, 2020 2020 educode las vegas. These include rockers, rollers, pins, pots, steel girder hangers, ptfeelastomeric, and elastomeric pads. Chapter 15 structural design requirements for design build contracts page 154 wsdot bridge design manual m 2350. Steel tutorial aashtoware bridge design and rating products. Design step 5 design of superstructure prestressed concrete. Wassef christopher smith kevin johns modjeski and masters, inc. This chapter is intended to provide general guidance in lrfd design and detailing practices. Design of plate girder pdf download please follow and like us. Design of prestressed concrete girder bridge request pdf. Introduction box girders have become a prominent element in the con.
This spreadsheet can be used for learning as well as designing purpose. E1 is fully restrained against lateral buckling throughout its span. Design example 37 b s d i lrfd negative moment loading article 3. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder. Introduction to the design of wood trusses by derek l.
The first example is of multi girder form, the second is of ladderdeck form. 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. 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 requirements set forth in the. Bridge bearings introduction aashto defines a bearing as a structural device that transmits loads while facilitating translation andor rotation. The span is 36 m and carries two concentrated loads as shown in fig. Analysis and design of plate girder and box girder test. Design requirements for the network rail standard box girder bridge are given in documents available from network rail. Have a well founded knowledge of design specifications. Plate girder design using lrfd american institute of steel. Pdf files civil engineering, design of plate girder, pdf, pdf of pate girder, plate girder, plate girder design steps pdf, plate girder pdf, plate girder solved example pdf, technical civil. The design process and corresponding calculations for steel igirders are the focus of this example, with particular emphasis placed on illustration of the optional moment redistribution procedures. Calculates noncomposite and composite for modular ratios n and 3n section properties for steel igirders with concrete deck. Aashto guide specifications for horizontally curved steel girder highway bridges, 2003. Postbuckling and tension field action are introduced and the roles of the main components in a plate girder identified.
Calculates cumulative stresses at critical locations for loads applied to noncomposite and composite sections. In addition to the examples that demonstrate the use of the aisc manual tables, design examples are provided for connection designs beyond the scope of the tables in the aisc manual. Plate girder design using lrfd university of maryland. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 549 sample calculations at 54 ft. View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples.
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