This book addresses the entire design process for a steel tub girder bridge and offers a list of pertinent references for each phase, including suggestions on how to find some hardtolocate documents. Design steps for plate girder design of steel structure ll duration. The design criteria is to strengthen the girder to obtain a. The flange section is varied along the length of the bridge following. Pdf design of plate girders miftakhu zaim academia. This document is disseminated under the sponsorship of the u.
The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Design to ec3 part 15 nanyang technological university. For example, the development of postbuckling action in a web plate, assumed in the previous lectures, can only occur when the elements at. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Enter the impact to be used for the entire bridge by clicking on impact in the tree and selecting fileopen from the menu. Many numerical examples have been considered to well understand the optimum design of plate girder. Depending on our design assumptions, we can idealize the cross frame in a.
Some authors examined the behavior and design of plate girder and also, many. Steel plate girder bridge design using indian standard. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. An example of application shows a good agreement with the developed formula.
Structural steel of primary members shall satisfy the toughness requirements for zone 3. Permanent steel deck forms are assumed between the girders. Allow girder end rotation avoid thick cap plates place the bolts outside of the column flanges. Aashto design specification lrfd bds section 6 8thed. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. 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. Calculates noncomposite and composite for modular ratios n and 3n section properties for steel igirders with concrete deck. A beam built up of steel plates and shapes which may be welded or bolted together to form a deep beam larger than can be produced by a rolling mill see illustration. Crane girder design 5 crane column cap plates allow girder end rotation avoid thick cap plates place the bolts outside of the column flanges. The existing bridge was designed for hs20 live loading. Assume case 1 follow procedure of design of plate girder. Lateral buckling of steel plate girders for bridges 022. Curved plate girder design for safe and economical construction justify recommendations in preferred. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design.
The subscripts p and n refer to positive and negative bending. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder. Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions. Plate girder bridges details and design requirements plate girders became popular in the late 1800s, when they were used in construction of railroad bridges. Each tutorial includes module files and step by step guidelines so you can improve your midas civil skills via completing a small project. The examples cover the principal steps in the verification of the. Girder analysis and design is performed using the computer. This report documents part of the results of a study of decked, precast, prestressed, concrete bridge girders.
Design example, 180 ring girders, 183 ring girder construction for lowpressure pipe, 183. The primary goal of the collaboration is to achieve steel bridge design and construction of the highest quality and value through standardization of the design, fabrication, and erection processes. Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18. Customized solutions book is provided pdf standard design and details of short span steel bridges solutions rolled beam recommendations plate girder recommendations standard design and details of corrugated steel pipe and structural plate solutions manufacturers steel. Pdf the behaviour of plate girders under in plane loading has. Lrfd design example for steel girder superstructure bridge us. Abstract 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 i girder bridge. The girder is to be strengthened due to section loss from corrosion. 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. Provides guidance for plate girders, rolled beams and tub girders.
The following note discusses the standard formula for the shear flow between web and flanges of a doubly symmetric beam which is used for weld design and gives the background to the formula in eurocode 3 part 51. The example bridge has four plate girders spaced at. In addition to the examples that demonstrate the use of the aisc manual tables, design examples are provided for. The companion consists of design examples in parts i, ii and iii. Use a36 steel and assume the girder has continuous. The typical welded plate girder consists of flange plates welded to a deep web plate. Although there are preliminary steps, lrfd specification appendix g2 gives the flexural capacity for a plate girder, whereas appendix f1. Tmcp hps is available in plate thicknesses up to 2 inches and in. Plate girder design using lrfd university of maryland. Plate girder article about plate girder by the free dictionary. The plates were joined together using angles and rivets to obtain plate girders of desired size. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. O ncsu research on dead load deflection for steel girders o design examples. Accessories ridge and valley cover plates and flat plates at change of deck direction when attached directly to the steel deck and as shown on contract documents, shall be furnished by cmc joist and deck.
This has led to increases in top flange size or the provision of plan bracing just for the erection condition where previously neither modification to the permanent design was likely to be needed. The first example is of multi girder form, the second is of ladderdeck form. Diaphragms crossframes throughgirders the beam or girder is fully braced at a location if twist is prevented. This publication presents worked examples of the detailed design of two composite highway bridges.
Simple span plate girder example aashtoware bridge. Design considerations for steel plate girder bridges. A beginners guide to simple plate girder design to ec3 part 15. This design example, plate girder shear and flexural strengthening i,nvolves the addition of steel strenghening material to an existing steel plate girder. One diagonal is in tension and one is in compression. Transverse web stiffeners and shear moment 017 interaction. A 10m span plate girder 600 mm deep by 300 mm wide with 30 mm thick flanges and a 10 mm thick web steel grade s355 carries a central point load of 800 kn. However, it is a necessary and important part of plate girder design when applying the load. University of kansas march 1, 2018 engineering conference crane girder design. Steel girder design example using 3rd edition aashto lrfd.
Analysis and design of composite steelgirder bridge. The contract documents should state the fit condition for which the. Stiffener prevents buckling two methods of design of plate girders. Repeat this process to define the other two stiffeners. O ten steel plate girder bridges were monitored o seven simple span o two twospan continuous o one threespan continuous o girder deflections were measured in the field during the concrete deck placement o developed 3dimensional finite element models to simulate deflections measured in the field.
The span is 36 m and carries two concentrated loads as shown in fig. Structural steel 1 of 18 rev plate girder design project. E1 is fully restrained against lateral buckling throughout its span. A steel plate girder should be designed to optimize weight savings in correlation with fabrication and erection costs. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. Department of transportation in the interest of information. This type of bridge provides benefits of rapid construction, and improved structural performance. Acknowledgements brian merrill, txdot brg john holt, txdot brg. Example front diaphragm has been both tilted and rotated in order to match hole patterns with web stiffeners. Design a typical floor joist for the two story office building indicated below. Mar 11, 2016 history and background of plate girders plate girders became popular in the late 1800s, when they were used in construction of railroad bridges. For curved girders, flange width no less than 25% of the web depth for straight girders, flange width no less than 20% of the web depth. Structural steel design, fabrication, and construction jamie f. The following american association of state highway and transportation officials.
Steel tutorial aashtoware bridge design and rating products. Plate girder shear and flexural strengthening design example design procedure the following american association of state highway and transportation officials aashto documents were used for this example. The first example is of multigirder form, the second is of ladderdeck form. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. Steel plate is available in 36, 50, and 50w grades. 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 i girder bridge. Examples to eurocode steel design to en 1993 bs en page. Section properties section properties are per foot of width. Note that a direct comparison should not be made between the unit weight of the example design contained herein and the unit weight of the design given in example 3 of the aisinsba publication entitled four lrfd design examples of steel highway bridges. This study concerns with finding the geometric dimensions of a plate girder which minimize the total weight and satisfy the design requirements using genetic algorithm ga, sequential quadratic. 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.
Structural steel design, fabrication, and construction. A plate girder cross section can take several forms. 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. Gusset plates and splice plates in trusses, arch ribs, tie girders, and rigid frames primary splice plates and cover plates in. Determine the design flexural strength i b m n of the following welded ishaped plate girder. This project includes a detailed outline and a series of flowcharts that serve as the basis for the design example. Zahn what differentiates a beam from a plate girder. As such, it is capable of supporting greater loads on longer spans.
Do not use knee braces allow for adjustment in placing the crane girder. 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. Lrfd design example for steel girder superstructure bridge. Aas hto m2 7 0, g ra d e 5 0 w u n c o a te d we a th e rin g s te e l with f y 5 0 ks i.
The design process and corresponding calculations for steel i girders are the focus of this example, with particular emphasis placed on illustration of the optional moment redistribution procedures. By 1950s welded plate girders replaced riveted and bolted plate girders. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. 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. A sample input file and selected excerpts from the corresponding output file are. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. A plate girder is subjected to a maximum factored moment of 4000 knm and factored shear force of 600 kn. Ce 331, spring 2002 joist and frame design example 1 2 1. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc.
Homogeneous and hybrid plate girders with limited plate. The research was performed to develop guidelines for design and construction and to address issues that significantly influence performance. Pdf this study concerns with finding the geometric dimensions of a plate girder. 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. Girders also rotated and tilted in this cambered state 57 girder web centerline tilted 1. Curved steel 3d example aashtoware bridge design and rating. Plate girders be made shallcomposite with the bridge deck be and should continuous over interior supports where applicable.
Precast, prestressed girder design example pgsuper training 242020 1. Plate girder shear and flexural strengthening design example. For an efficient design, any calculation relating to the ultimate limit state should take the postbuckling action into account. Hypothetical design calculations for shear force capacity. Calculates cumulative stresses at critical locations for loads applied to noncomposite and composite sections. The superstructure design includes the following elements. Design considerations for steel plate girder bridges the texas. Steel plate girder deflections a look at the development and.
For this steel girder design example, a plate girder will be designed for an hl93 live load. The design may be based on any one of the following assumptions. 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. The purpose of the plate girder is to build a beam that is larger than anything that can be built by a steel mill or factory. Plate girder bridges details and design requirements. Steel bridge alliance or that of any person named herein that these data and suggested practices are suitable for any. The torsional deformation of the girders either from buckling or torsional moments result in the following deformation. Contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally. Reference collaboration constructability document to evaluate introduction of shop splices two or fewer in. Steel truss plate girders two or more regular beams types of plate girders innovative use of material in plate girder components of a plate girder. Overall presentation outline introduction analysis topics. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. It gives two worked examples, one for a multi girder bridge and one for a.
Introduction to the design of wood trusses by derek l. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. Crotch plate design for outlets and true wyes, 109 crotch plate design, 109 nomograph use in radial outlet and wyebranch design, 110 crotch plate connections, 114 true wye design, 122 design of ellipsoidal heads, 125 testing of fittings, 126 joint harnesses, 126 anchor rings, 143 anchor ring design, 149 outlets, 155 blowoff connections, 155. Analysis and design of plate girder and box girder test. 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 design example was edited in 2012 by hdr engineering, inc. Expand the stiffener definitions tree item and double click on transverse.
Review this document when initiating a steel bridge design. Difference between beam and girder with 3d animation duration. Shape sections, other than pipe and tubing, are typically available in 36, 50, or 50w grades. Characteristics design of gantry girder is a classic example of laterally unsupported beam. Additionally, the weld design for the webtoflange joint of the plate girders is demonstrated along with all applicable components of the stiffener design and cross frame member design. Design a typical floor joist university of alabama. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. Neglecting the thickness of the flange in calculating the shear flow is clearly conservative. The design example includes detailed design computations for the following bridge features.
837 1095 79 429 204 626 1401 695 465 420 1358 1394 65 187 1010 1525 1287 1346 727 234 36 706 1458 1521 395 426 1097 96 248 208 141 405 920 583 658 15