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. This design example demonstrates the design of a tangent threespan continuous composite tub girder bridge with a span arrangement of 187. This bar will contribute to the overall resistance and will be accounted for in the calculations below. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. 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. This publication presents worked examples of the detailed design of two composite highway bridges. View example in pdf format design example 2 download example as a mathcad workbook zip adhesive anchor examples. Since revisions or additions to the design file drawings may occur at any time, the. Analysis and design of plate girder and box girder test. This publication offers a general overview of the design of steel framed buildings to the structural eurocodes and includes a set of worked examples. Calculates noncomposite and composite for modular ratios n and 3n section properties for steel igirders with concrete deck.
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. Steel tutorial aashtoware bridge design and rating products. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Prestressed concrete girders drafting and design presentation standards manual, transport and main roads, march 2018 1. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. 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. 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. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Pti 32 numerical example key concepts secondary moments equivalent loads tensile stress computation 1 4 4 23 11. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. E1 is fully restrained against lateral buckling throughout its span. The first example is of multigirder form, the second is of ladderdeck form.
Structures design office structures detailing manual. Have a well founded knowledge of design specifications. Lrfd design example for steel girder superstructure bridge fhwa. 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. Requirements for special moment frame continuity sec. This document is disseminated under the sponsorship of the u. Structural steel design, fabrication, and construction jamie f. For this steel girder design example, a plate girder will be designed for an hl93 live load.
Design plate girder spreadsheet computerized civil engineer. Precast, prestressed girder design example pgsuper training 242020. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design. 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. Design guidelines for steel trapezoidal box girder systems. Design step 5 design of superstructure prestressed concrete. Wassef christopher smith kevin johns modjeski and masters, inc. The nu girder bridge design and detailing manual documents current best practices for nu girder bridge designs in alberta. 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. 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.
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. For this example we will assume an interior girder deflection of 6 and an exterior girder deflection of 5. Four span simply supported steel plate girder input. 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. Expedite and economize the design process simple repetitive details and member sizes bridge parameters span lengths. 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. This chapter is intended to provide general guidance in lrfd design and detailing practices. The general basis of plate girder design is discussed in a simplified way as a prelude to a more detailed presentation in lectures 8. Appendix b example problems transportation research board. Structural steel design, fabrication, and construction.
The examples cover the principal steps in the verification of the. Diaphragms crossframes through girders the beam or girder is fully braced at a location if twist is prevented. American association of state highway and transportation officials. Design of plate girder pdf download please follow and like us. View example in pdf format design example 1 download example as a mathcad workbook zip castinplace flat slab bridge design. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 549 sample calculations at 54 ft.
In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Structures design office lrfd design examples files pdfs fdot. Design of prestressed concrete igirder bridge superstructure. 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. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. 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 span is 36 m and carries two concentrated loads as shown in fig. From girder end midspan of noncomposite beam girder top stress. Texas department of transportation the national steel bridge alliance has published this document in.
Concrete box and prestressed concrete tubgirders see section 5. Structures design office structures detailing manual examples. 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. Comprehensive design example for prestressed concrete girder. 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. Bridge bearings introduction aashto defines a bearing as a structural device that transmits loads while facilitating translation andor rotation. New window will appear, fill the data as shown below. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. Dc1 loads applied to the noncomposite steel sec tion and dc2 and dw loads applied to the longterm composite 3n 24 section. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2.
Aashto guide specifications for horizontally curved steel girder highway bridges, 2003. 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. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. 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. As the name suggests this design plate girder spreadsheet can design plate girders. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder. Department, sri vasavi institute of engineering and technology, andhra pradesh. 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 of prestressed concrete girder bridge request pdf. Introduction box girders have become a prominent element in the con. Design to ec3 part 15 nanyang technological university. Lrfd steel girder superstructure design example lrfd. Structures design office lrfd design examples files pdfs.
Appendix i design example integral steel boxbeam pier. Texas department of transportation walter gatti tensor engineering john holt, p. The purpose of this document is to illustrate how the pgsuper computer program. Steel girder design example using 3rd edition aashto lrfd.
Plate girder design using lrfd american institute of steel. Construction and load tests of a segmental precast box. Aashto guide specifications for horizontally curved steel. Design requirements for the network rail standard box girder bridge are given in documents available from network rail. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. Zahn what differentiates a beam from a plate girder. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. Moment frame assigned to seismic design category d, e, or f. These structures detailing manual examples are provided in pdf documents. Lrfd design example for steel girder superstructure bridge. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Practical steel tub girder design april 2005 authors domenic coletti, p. Postbuckling and tension field action are introduced and the roles of the main components in a plate girder identified.
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. Formula 5 may seem too complicated for design purposes. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. Chapter 15 structural design requirements for design build contracts page 154 wsdot bridge design manual m 2350. Structural steel 1 of 18 rev plate girder design project. Steel tutorial stl1 simple span plate girder example. 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. Characteristics design of gantry girder is a classic example of laterally unsupported beam. These include rockers, rollers, pins, pots, steel girder hangers, ptfeelastomeric, and elastomeric pads. For a complete glossary of terms refer chapter 1 introduction. Step 2 retrieve interior girder sgl predictions for dead load deflection along the span, 110 or 120 points. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete.
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. Impact of lrfd specifications on design of texas bridges. This spreadsheet can be used for learning as well as designing purpose. For this design example, a conventional line girder analysis program was used to determine dead load forces and reactions. This document provides guidance for the design of a precast, prestressed beam bridge utilizing the. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer.
Precast, prestressed girder design example pgsuper training 242020 1. Bibm and ermco are delighted to make these authoritative documents available to design engineers, software developers and all others with an interest. Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18. 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. Nu girder bridge design and detailing manual open government. Extend bearing stiffeners the full height of the girder. Plate girder design using lrfd university of maryland. Developed by corven engineering for the federal highway administration. Tensioning building structures march 12, 2020 2020 educode las vegas. The manual focuses on the design and detailing of nu girder bridges. 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. Only the design of slab bridge will be used for illustration.
Twospan december 2015 continuous straight composite steel i girder bridge 6. Analysis and design of prestressed box girder bridge by irc. The first example is of multi girder form, the second is of ladderdeck form. Analysis and design of composite steelgirder bridge.
Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. 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.
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. 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. Chapter 15 structural design requirements for designbuild. 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. Introduction to the design of wood trusses by derek l.
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. 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. In addition, a design example for a twospan plate girder superstructure is included. A beginners guide to simple plate girder design to ec3 part 15. Part i includes design guidelines, plates, and administrative procedures intended to promote consistency and. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. A twospan bridge example is used here to illustrate the design steps in detail. To design prestressed girders using line girder analysis. It is intended to supplement the requirements of the bridge structures design criteria bsdc. Design guidelines for steel trapezoidal box girder systems 6.223 1524 10 605 718 807 1270 663 584 804 758 939 728 1582 1016 1376 168 1399 24 486 728 1453 81 132 650 1553 1011 1101 907 43 1559 813 671 803 921 901 1033 340 1284 764 1025 131 1472