Structural steel 1 of 18 rev plate girder design project. Plate girder design using lrfd american institute of. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. 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. Optimum design of plate girder using twolevels optimization. Box culvert is a usually default buried structure type that serves a variety of purposes. Cl stress modification coerficient depending on 01.
Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Plate girder literature af area of compression flange af as area of transverse stiffener as aw area of web aw a panel length measured from centerline to a centerline of transverse stiffener b width of comp. 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. Standard design and details of short span steel bridges 5 i. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. November 16, 2015 july 1, 2016 rahul sheokand 2 comments design plate girder spreadsheet, plate girder design plate girders are most widely use steel structural elements after rolled section. 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. Abstract in this paper two important issues related to stability problems of stiffeners in plate and. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of. Preferred practices for steel bridge design, fabrication, and. Box girder bridges box girders are a particular form of plate girder, with two webs joined by common top and bottom flanges. Design of plate girders 2 of welded plate girders in this book. Lrfd steel design ohio department of transportation. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills.
Girder analysis and design is performed using the computer. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. The minimum flangeplate size for a plate girder is 12 in. A beginners guide to simple plate girder design to ec3 part 15. Formula 5 may seem too complicated for design purposes. What is the difference between plate girder and gantry girder. For this steel girder design example, a plate girder will be designed for an hl93 live load. Some authors examined the behavior and design of plate girder and also, many studies. It calculates the envelopes for all the required design forces inlcuding vertical loads and horizontal effects of the moving cranes, moments and deflections. 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. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. Based on these, the summation of load effects due to different load combinations for various load factors are obtained. In addition to the examples that demonstrate the use of the aisc manual tables, design examples are provided for. The design output includes deflection, bending moment and shear force diagrams, and calcsheets with detailed calculations.
Postbuckling and tension field action are introduced and the roles of the main components in a plate girder identified. Recently many steel plate girder bridges have had design and construction issues. Plate girder bridges details and design requirements. Plate girder article about plate girder by the free. Abstract the purpose of this example is to illustrate the use of the aashto lrfd bridge design for. Contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally. The span is 36 m and carries two concentrated loads as shown in fig. Analysis and design of plate girder and box girder test. 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. May 18, 20 contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally.
In buildings, when large columnfree spaces are designed to be used as an assembly hall, for example, the plate girder is often the economical solution. 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. Design considerations for steel plate girder bridges the texas. Line beam analysis for moving vehicle loads to euro code en 19912. In buildings, when large columnfree spaces are designed to be used as an assembly hall, for example, the. The load effects such as bending moment and shear force are to be found using individual and unfactored load cases. Mar 22, 2018 this feature is not available right now. It is typically used for conveying water and also frequently used for pedestrian or cattle underpasses. 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. For curved girders, the minimum flange thickness is 1 in. The plate girder bridges are generally suitable for the shorter span to medium span and support highways, railroads or other types of traffic. Characteristics design of gantry girder is a classic example of laterally unsupported beam. In addition to g arvind kumars answer, you may like to look into this answer i had posted earlier, to a similar question.
As wide a flange plate as practical should be used, consistent with stress and flange widththickness ratio, b t, requirements. This design example, plate girder shear and flexural strengthening, involves the. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Simplified inelastic design of steel igirder bridges, asce journal of bridge engineering, mayjune vol. Many numerical examples have been considered to well understand the optimum design of plate girder. The first task, analysis and design of horizontally curved plate girder and. Design considerations for steel plate girder bridges. Design example 37 b s d i lrfd negative moment loading article 3. Lrfd steel girder superstructure design example lrfd. Lrfd design example for steel girder superstructure bridge. Have a well founded knowledge of design specifications. Abstract in this paper two important issues related to. 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 recommended reading. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem.
A plate girder is a deep builtup beam consisting of plates or plates and angles meant for carrying heavy loads on large spans. With these flowcharts, this discussion will focus on the design of plate girders according to lrfd. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. Analysis and design of composite steelgirder bridge. 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.
Pdf the behaviour of plate girders under in plane loading has been. The standard tandem system with the udl system lm1, annex a vehicles, svs and sovs to uk national annex lm3, and fatigue load models are analysed as moving loads across a single or multispan continuous line beam to determine critical bending moments, shear forces and reactions. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. 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. Plate girders ii where, qe elastic critical shear strength values to be used in design for different values of ad and dt are tabulated in table 1. The fifth example is a 454m, steel plate girder bridge in the inland pacific northwest with a design acceleration of 0. Many numerical examples have been considered to well understand the optimum desi gn of plate girder. If the larger span over 20 m is to be provided with the plate girders then the plate girders should be combined with the extra cover plates.
Design a gantry girder to be used in an industrial b uilding carrying a manually operated overhead travelling crane, for the following data in table 1. Plate girder design using lrfd university of maryland. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. 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. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. 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 designanalysis program no two programs will match exactly of course. The significance of these items can be seen in the lrfd manual flowcharts figs.
The companion consists of design examples in parts i, ii and iii. 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. 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. Standard design details of corrugated steel pipe and structural plate solutions 20 iv. Design of singlespan steel portal frames to bs 5950. 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. The design may be based on any one of the following assumptions. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Design plate girder spreadsheet computerized civil engineer. This design example was edited in 2012 by hdr engineering, inc.
As the name suggests this design plate girder spreadsheet can design plate girders. Ii, chapter 1a highway structures design handbook, published by american iron and steel institute in cooperation with hdr engineering. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. Fhwa launches new nationwide seismic bridge design training in a composite plate girder with transverse stiffeners spaced at a distance b along the span, consider a finite length, dx of the web panel near the support as. Dec, 2012 plate girder for efficient design it is usual to choose a relatively deep girder, thus minimizing the required area of flanges for a given applied moment, msd. Pdf design of plate girders miftakhu zaim academia. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. An example of application shows a good agreement with the. Plate girder article about plate girder by the free dictionary. 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.
Pdf this study concerns with finding the geometric dimensions of a plate girder which. Examples of such situations arise in long span bridges, ship girders, transfer girders in. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. For example, the liveload distribution factor for the interiorgirder bending moment for steel igirder bridges with a concrete deck loaded by two or more design lanes is. Lrfd design example simple span steel girder check web proportions per lrfd 6. Plate girder design using lrfd american institute of steel. What is the difference between plate girder and gantry. The results obtained include curves of optimal pairs of web depth and.
Part i includes design guidelines, plates, and administrative procedures intended to promote consistency and. The superstructure design includes the following elements. Plate girder shear and flexural strengthening design example. Introduction box girders have become a prominent element in the con. Lrfd design example simple span steel girder trial section 20 plastic neutral axis of plate girder elastic neutral axis of plate girder 23. In addition, a design example for a twospan plate girder superstructure is included. Steel girder design example using 3rd edition aashto lrfd. Plate girders are used in both buildings and bridges.
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