Design example 37 b s d i lrfd negative moment loading article 3. 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. The first task, analysis and design of horizontally curved plate girder and. 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. The general basis of plate girder design is discussed in a simplified way as a prelude to a more detailed presentation in lectures 8. The design output includes deflection, bending moment and shear force diagrams, and calcsheets with detailed calculations. Plate girder design using lrfd american institute of steel. 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. Pdf this study concerns with finding the geometric dimensions of a plate girder which. This design example was edited in 2012 by hdr engineering, inc. For this steel girder design example, a plate girder will be designed for an hl93 live load.
Based on these, the summation of load effects due to different load combinations for various load factors are obtained. A beginners guide to simple plate girder design to ec3 part 15. 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. In buildings, when large columnfree spaces are designed to be used as an assembly hall, for example, the. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. The design may be based on any one of the following assumptions. Introduction box girders have become a prominent element in the con.
Structural steel 1 of 18 rev plate girder design project. Standard design and details of short span steel bridges 5 i. 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. Lrfd steel girder superstructure design example lrfd. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Pdf design of plate girders miftakhu zaim academia. For curved girders, the minimum flange thickness is 1 in. 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. Lrfd design example for steel girder superstructure bridge. 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. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills.
Characteristics design of gantry girder is a classic example of laterally unsupported beam. Box girder bridges box girders are a particular form of plate girder, with two webs joined by common top and bottom flanges. The load effects such as bending moment and shear force are to be found using individual and unfactored load cases. 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. Plate girder bridges details and design requirements.
Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. Line beam analysis for moving vehicle loads to euro code en 19912. Contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally. Many numerical examples have been considered to well understand the optimum design of plate girder. Some authors examined the behavior and design of plate girder and also, many studies. The significance of these items can be seen in the lrfd manual flowcharts figs.
Optimum design of plate girder using twolevels optimization. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. Plate girder design using lrfd university of maryland. 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. Abstract in this paper two important issues related to stability problems of stiffeners in plate and. Lrfd design example simple span steel girder trial section 20 plastic neutral axis of plate girder elastic neutral axis of plate girder 23. 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. In such cases, the designer must choose between a plate girder and a truss. Plate girder article about plate girder by the free dictionary. May 18, 20 contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally. In addition to g arvind kumars answer, you may like to look into this answer i had posted earlier, to a similar question. Design to ec3 part 15 nanyang technological university. Design of plate girders 2 of welded plate girders in this book. Design of singlespan steel portal frames to bs 5950.
Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Plate girder article about plate girder by the free. What is the difference between plate girder and gantry girder. As wide a flange plate as practical should be used, consistent with stress and flange widththickness ratio, b t, requirements. The minimum flangeplate size for a plate girder is 12 in.
Girder analysis and design is performed using the computer. Have a well founded knowledge of design specifications. With these flowcharts, this discussion will focus on the design of plate girders according to lrfd. Pdf the behaviour of plate girders under in plane loading has been. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Plate girders are used in both buildings and bridges. Examples of such situations arise in long span bridges, ship girders, transfer girders in. Steel girder design example using 3rd edition aashto lrfd.
Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. The plate girder bridges are generally suitable for the shorter span to medium span and support highways, railroads or other types of traffic. Standard design details of corrugated steel pipe and structural plate solutions 20 iv. Analysis and design of composite steelgirder bridge. 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. Design considerations for steel plate girder bridges. 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. E1 is fully restrained against lateral buckling throughout its span.
It calculates the envelopes for all the required design forces inlcuding vertical loads and horizontal effects of the moving cranes, moments and deflections. Simplified inelastic design of steel igirder bridges, asce journal of bridge engineering, mayjune vol. 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. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Analysis and design of plate girder and box girder test. Part i includes design guidelines, plates, and administrative procedures intended to promote consistency and. The superstructure design includes the following elements. Preferred practices for steel bridge design, fabrication, and. The results obtained include curves of optimal pairs of web depth and.
Formula 5 may seem too complicated for design purposes. 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. 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. 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. It is typically used for conveying water and also frequently used for pedestrian or cattle underpasses. Mar 22, 2018 this feature is not available right now. Ii, chapter 1a highway structures design handbook, published by american iron and steel institute in cooperation with hdr engineering. What is the difference between plate girder and gantry. Design plate girder spreadsheet computerized civil engineer. 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. In addition to the examples that demonstrate the use of the aisc manual tables, design examples are provided for. 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. Design considerations for steel plate girder bridges the texas.
Abstract in this paper two important issues related to. Plate girder design using lrfd american institute of. 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. A plate girder is a deep builtup beam consisting of plates or plates and angles meant for carrying heavy loads on large spans. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. Cl stress modification coerficient depending on 01. 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. Many numerical examples have been considered to well understand the optimum desi gn of plate girder. The companion consists of design examples in parts i, ii and iii. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. As the name suggests this design plate girder spreadsheet can design plate girders. Lrfd design example simple span steel girder check web proportions per lrfd 6. In addition, a design example for a twospan plate girder superstructure is included.
Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of. 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. 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. Abstract the purpose of this example is to illustrate the use of the aashto lrfd bridge design for. The fifth example is a 454m, steel plate girder bridge in the inland pacific northwest with a design acceleration of 0. Lrfd steel design ohio department of transportation.
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. 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. Box culvert is a usually default buried structure type that serves a variety of purposes. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. Postbuckling and tension field action are introduced and the roles of the main components in a plate girder identified. Plate girder shear and flexural strengthening design example.
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