A plate girder is a deep builtup beam consisting of plates or plates and angles meant for carrying heavy loads on large spans. Design considerations for steel plate girder bridges the texas. In spite of availability of full length of flange angles and flange plates, sometimes it becomes necessary to make flange splices, for example, the. Design to ec3 part 15 nanyang technological university. E1 is fully restrained against lateral buckling throughout its span. This document is disseminated under the sponsorship of the u. The existing bridge was designed for hs20 live loading. Analysis and design of plate girder and box girder test. Design a welded plate girder 24 m in effective span and simply supported at ends. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer.
Design example 37 b s d i lrfd negative moment loading article 3. As wide a flange plate as practical should be used, consistent with stress and flange widththickness ratio, b t, requirements. We wanted an interior structural steel girder to be placed within the plane of the precast slab units, thereby producing a thin floor construction akin to flatplate with a minimum floor to ceiling height. Guidelines and tutorial for modeling haunched steelgirder bridges. The design may be based on any one of the following assumptions. 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. For curved girders, the minimum flange thickness is 1 in. Guidelines and tutorial for modeling haunched steel girder bridges.
For exterior girder design with a slab cantilever equal to or less than half the adjacent girder interior spacing, use the live load distribution factor for the interior girder. Title and subtitle impact of overhang construction on girder design 5. Steel plate girder bridge design using indian standard. 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. Design considerations for steel plate girder bridges. Design of plate girders 2 of welded plate girders in this book.
The slab cantilever is the distance from the centerline of the exterior girder to the edge of the. Recently many steel plate girder bridges have had design and construction. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. 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. 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. Sep 25, 20 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. An example of application shows a good agreement with the developed formula. Plate girder article about plate girder by the free. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol.
A number of prestressed concrete i girder bridges built in the past several decades have demonstrated the ability of precast, prestressed spliced girder bridges to compete with structural steel plate girder bridges in the 120 ft 300 ft span range. 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 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. This lecture seeks to complete the discussion of plate girder design by considering further aspects of detailed design. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Use is made of a computer program to compare the behaviour of. The fifth example is a 454m, steel plate girder bridge in the inland pacific northwest with a design acceleration of 0. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. A number of prestressed concrete igirder bridges built in the past several decades have demonstrated the ability of precast, prestressed spliced girder bridges to compete with structural steel plate girder bridges in the 120 ft 300 ft span range. It carries an uniformly distributed load of 100 knm. Design of steel girders with diagram your article library. Girder is a free and open source webbased data management platform developed bykitwareas part of theresonant data and analytics ecosystem.
The span is 36 m and carries two concentrated loads as shown in fig. Determine the design flexural strength i b m n of the following welded ishaped plate girder. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Girder is both a standalone application and a platform for building new web services. Analysis and design of composite steelgirder bridge. Due to the relatively thin webs used in plate girders, the design for shear is more complicated. Design guidelines for steel trapezoidal box girder systems. Title and subtitle design guidelines for steel trapezoidal box girder systems 6.
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 top flange of the girders on this bridge are fully embedded into the concrete deck slab. The example bridge has four plate girders spaced at. Pdf the behaviour of plate girders under in plane loading has been. Preferred practices for steel bridge design, fabrication, and.
When the deck slab after casting has gained strength at least upto 75 per cent of the characteristic strength, the wheelguard, footway slab, railing, wearing etc. The significance of these items can be seen in the lrfd manual flowcharts figs. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. This page introduces the bridge design manual lrfd, which provides design methodology for bridges that considers load and resistance factors based on the known variability of applied loads and material properties. It calculates the envelopes for all the required design forces inlcuding vertical loads and horizontal effects of the moving cranes, moments and deflections. 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. Aashto manual for condition evaluation of bridges, section 6. Plate girders are used in both buildings and bridges. The plates were joined together using angles and rivets to obtain plate girders of desired size. Preferred practices for steel bridge design, fabrication. Formula 5 may seem too complicated for design purposes. Abstract in this paper two important issues related to. 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.
Personal pictures taken on field trip to twitchell creek bridge july 2009 5. Plate girder design using lrfd american institute of steel. All the standard hotrolled shapes in the manual, the webs are compact. From the comparison, the author comes out with a design example for both design method. Approximate analysis of horizontally curved girder bridges by ann l. The aashtonsba steel bridge collaboration document guidelines for. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. The girder is to be strengthened due to section loss from corrosion. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. Use a36 steel and assume the girder has continuous bracing for its compression flange. Examples to eurocode steel design to en 1993 bs en page. The minimum flangeplate size for a plate girder is 12 in. Characteristics design of gantry girder is a classic example of laterally unsupported beam.
Structural steel 1 of 18 rev plate girder design project. Abstract the purpose of this example is to illustrate the use of the aashto lrfd bridge design for. Its meant to enable quick and easy construction of web applications that have some or all of the. Department of transportation in the interest of information.
Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Plate girder shear and flexural strengthening design example. 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. With these flowcharts, this discussion will focus on the design of plate girders according to lrfd. Plate girder article about plate girder by the free dictionary. This tutorial provides an introduction to the assignment of joint patterns. In addition, a design example for a twospan plate girder superstructure is included. Interaction of the various components considers the design and detailing of the rail the girder, the horizontal girder or surge plate and columns and founda tions. The primary method of customizing and extending girder is via the development of plugins, the process of which is described in the plugin development section of this documentation. Assume case 1 follow procedure of design of plate girder. This design example was edited in 2012 by hdr engineering, inc. Plugins can, for example, add new rest routes, modify or remove existing ones, serve up a different web application from the server root, hook into model lifecycle. Some states limit the maximum transportable length of a member to 120 ft and the weight to 70 tons.
The design criteria is to strengthen the girder to obtain a. Have a well founded knowledge of design specifications. In such cases, the designer must choose between a plate girder and a truss. 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. Plate girder design using lrfd american institute of. Report date extending maximum length of the folded steel plate girder bridge system fspgbs, exceeding 100 ft. Abstract in this paper two important issues related to stability problems of stiffeners in plate and.
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 composite girders are designed on the basis of any one of the following assumptions. Plate girder design using lrfd university of maryland. 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. Plate girder bridges details and design requirements plate girders became popular in the late 1800s, when they were used in construction of railroad bridges.
The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Bridge materials structural steel window as shown below. 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. Introduction box girders have become a prominent element in the con. 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. A detailed and extensive procedure which describes the modeling, analysis, and design of a 3d steelframe pipe rack system. Mar 28, 2019 a detailed and extensive procedure which describes the modeling, analysis, and design of a 3d steelframe pipe rack system. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. The design output includes deflection, bending moment and shear force diagrams, and calcsheets with detailed calculations.
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