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. 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. 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. Design plate girder spreadsheet computerized civil engineer. Typical highway bridge cross section design forces and stresses a composite girder must be analyzed under several different loadings depending upon the construction method. The first task, analysis and design of horizontally curved plate girder and. However, for plate girder roadway bridges the range may be extended to. 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. Recently many steel plate girder bridges have had design and construction issues. Design guidelines for steel trapezoidal box girder systems. A girder is deemed as being hybrid when it is fabricated using different steel grades for the flanges and web panel. Optimization of plate girders abspoel 2014 steel construction. Dec, 2012 plate girder plate girders are at their most impressive in modern b id construction where main spans of d bridge t ti h i f well over 200m are feasible, with corresponding crosssection d th h ti depths, haunched over th h d the supports, in the range of 510m. Design considerations for steel plate girder bridges.
Personal pictures taken on field trip to twitchell creek bridge july 2009 5. Design of plate girder comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. The web panel of plate girder is slender in cross section and susceptible to shear buckling. Openings are frequently required, particularly in building construction, to allow access for service ducts, etc. An influence line analysis is required for truck loads. Pdf design of plate girders miftakhu zaim academia.
Eurocode 3 1 only allows the application of the tension field method, which has been shown in earlier lectures to give a significantly enhanced load resistance, when the web is stiffened. Numerical analysis of buckling strength of welded plate. Zahn what differentiates a beam from a plate girder. 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. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. Numerical analysis of buckling strength of welded plate girder with corrugated web plate girder mr. Assume case 1 follow procedure of design of plate girder. Jamestown steel is renowned for the quality of its heavy steel production facilities, and for the expertise it brings to precision engineering projects. Mar 22, 2018 this feature is not available right now. As the name suggests this design plate girder spreadsheet can design plate girders. Analysis and design of plate girder and box girder test. Plate,girders can often be loaded beyond the web buckling load predioted by the classical plate buck11n theoryo this is due to the fact that the web plate is framed by flanges and transverse stiffeners which allow for a redistribution of stresso since a plate girder web is usually subjected to bending, shear or a combination of the two, the. 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. The manufacture of plate girders requires experience and expertise.
Design optimization of plate girder using generalized reduced gradient and constrained artificial bee colony algorithms article pdf available july 2012 with 303 reads how we measure reads. For this steel girder design example, a plate girder will be designed for an hl93 live load. Plate girder definition is a builtup girder resembling an i beam in cross section but having a rolled steel plate for a web and flanges that usually consist of angles alone or angles and plates. Plate girder design using lrfd american institute of steel. Girder designs must meet the following requirements. Preferred practices for steel bridge chapter 1introduction design, fabrication, and erection. 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. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. History and background of plate girders plate girders became popular in the late 1800s, when they were used in construction of railroad bridges.
Initial design of main plate girder is generally based on experience or thumb rules such as those given below. Use a36 steel and assume the girder has continuous bracing for its compression flange. For threeand fourspan continuous girder units make interior spans about. The increase in demand, and our commitment to meeting our customers requirements in the matters of quality and timeliness. Hs20 live load rating factor equal to or greater than 1. The depth between the outer surfaces of the flanges is termed as overall depthdo or depth of the plate girder.
G student 2assistant professor 3professor 1,2,3department of civil engineering 1,2amrutvahini college of engineering, sangamner, india 3g. Plate girders ii generally the thickness of flange plates is not varied along the spans for plate girders used in buildings. Some of these issues relate to not following the txdot. For railway bridges, the girder depth will usually be in the range l o 12 to l o 8, where l o is the length between points of zero moment. Lrfd steel girder superstructure design example lrfd. 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. Larger girders 1 m3 feet deep or more are made as plate girders, welded or bolted together from separate pieces of steel plate. Design guidelines for steel trapezoidal box girder systems 6. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. The design may be based on any one of the following assumptions. Neither of these two situations is covered in part 1. E1 is fully restrained against lateral buckling throughout its span.
Design to ec3 part 15 nanyang technological university. Plate girder shear and flexural strengthening design. A hybrid plate girder utilizes high strength steel for the flanges and comparatively low strength steel for the web panel. The curtailment of the thicker plate is made by reducing thickness t f, keeping b the same. Design considerations for steel plate girder bridges the texas. Cl stress modification coerficient depending on 01.
A girt is a vertically aligned girder placed to resist sheer loads. Use a 709 grade hps 70w steel for painted bridges if it is economical or otherwise beneficial to do so. Plate girder buckling truss free 30day trial scribd. In plate girder, the web is always slender, as dt w 126. Strength limit state interior girder exterior girder bending moment 0. The span is 36 m and carries two concentrated loads as shown in fig. 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. Welded plate girders, which are the most common form of plate girders, are built up structural steel members that consists of flange plates welded to a web plate. Plate girder design using lrfd american institute of. Threeand fourspan continuous girder units are preferable. Use a 709 grade 50w or hps 70w steel for unpainted bridges. It is the main horizontal support of a structure which supports smaller beams. Design example 312 b s d i structural analysis summary liveload distribution factors.
Plate girder free download as powerpoint presentation. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Two other important aspects of plate girder design are the treatment of girders with longitudinal web stiffeners, and of girders with large openings in the web plates. A plate girder is subjected to a maximum factored moment of 4000 knm and factored shear force of 600 kn. Preferred practices for steel bridge design, fabrication, and. Shedesignofaplategirdebrailroadbridge i tableofcontents. By 1950s welded plate girders replaced riveted and bolted plate girders. In very long continuous spans span 50 m variable depth plate girders may be more economical. The resulting floor system is essentially a flat plate where few, if any, steel beams protrude below the bottom of the plank. This document provides guidance to help steel bridge designers working on texas department of transportation txdot projects to achieve optimal quality and value in steel bridges. Plate girder definition of plate girder by merriamwebster.
Thus, concerning the be havior of the web, there appears no reason why the computed web buckling strain should not be exceeded in a plate girder under. Optimisation of plate girders tu delft repositories. 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. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Generally an isection with a channel section is chosen, though an isection with a plate at the top flange may be used for light cranes. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Plate girders are large i shaped sections built up from plates, as shown in fig. Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18.
Plate girder design using lrfd university of maryland. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Girder design contd the first step in the design of plate girder section is to select the value of the web depth, d. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. Pdf design optimization of plate girder using generalized. When the gantry is not laterally supported, the equation to be used to select a trial section is as follows. The momentresisting capacities of plate girders lie somewhere between those of deep standard rolled wideflange shapes and those of trusses. Design of plate girder part 2 design of plate girder part. Flange design flange is a solid plate of width b and thickness t f. Plate girder bridges details and design requirements. In general, depth of the plate girder is kept 110 th to 112 th of the span. The track is on an 8 curve, for which the maximum design speed is 30 mih. For noncomposite plate girder the width of flange plate is chosen to be about 0.
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