For noncomposite plate girder the width of flange plate is chosen to be about 0. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. For threeand fourspan continuous girder units make interior spans about. E1 is fully restrained against lateral buckling throughout its span. Pdf design optimization of plate girder using generalized. Preferred practices for steel bridge chapter 1introduction design, fabrication, and erection. Plate girder design using lrfd university of maryland. By 1950s welded plate girders replaced riveted and bolted plate girders. 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. For this steel girder design example, a plate girder will be designed for an hl93 live load. Structural steel 1 of 18 rev plate girder design project. Plate girder free download as powerpoint presentation.
Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. The resulting floor system is essentially a flat plate where few, if any, steel beams protrude below the bottom of the plank. 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. Some of these issues relate to not following the txdot. 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. A plate girder is subjected to a maximum factored moment of 4000 knm and factored shear force of 600 kn. The momentresisting capacities of plate girders lie somewhere between those of deep standard rolled wideflange shapes and those of trusses. Plate girders are large i shaped sections built up from plates, as shown in fig. It is the main horizontal support of a structure which supports smaller beams. Design of plate girder part 2 design of plate girder part. A girt is a vertically aligned girder placed to resist sheer loads. Initial design of main plate girder is generally based on experience or thumb rules such as those given below.
The manufacture of plate girders requires experience and expertise. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. The web panel of plate girder is slender in cross section and susceptible to shear buckling. 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. Shedesignofaplategirdebrailroadbridge i tableofcontents. The first task, analysis and design of horizontally curved plate girder and. Plate girder definition of plate girder by merriamwebster. In very long continuous spans span 50 m variable depth plate girders may be more economical. Plate girder buckling truss free 30day trial scribd. Plate girder design using lrfd american institute of. Use a 709 grade 50w or hps 70w steel for unpainted bridges.
We manufacture steel plate girders, jamestown profiling. Mar 22, 2018 this feature is not available right now. 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 hybrid plate girder utilizes high strength steel for the flanges and comparatively low strength steel for the web panel.
The span is 36 m and carries two concentrated loads as shown in fig. Recently many steel plate girder bridges have had design and construction issues. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. In general, depth of the plate girder is kept 110 th to 112 th of the span. Cl stress modification coerficient depending on 01. Design guidelines for steel trapezoidal box girder systems. 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. 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. Girders often have an ibeam cross section composed of two loadbearing flanges separated by a stabilizing web, but may also have a box shape, z shape, or other forms. Mar 29, 2018 learn how to design a plate girder step by step with simple method. 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.
Girder design contd the first step in the design of plate girder section is to select the value of the web depth, d. History and background of plate girders plate girders became popular in the late 1800s, when they were used in construction of railroad bridges. Two simply supported, welded, throughplate girders carry the single track of a railroad bridge on an 86ft span fig. Such rules also give a good estimate of dead load of the bridge structure to be designed. The design may be based on any one of the following assumptions. The curtailment of the thicker plate is made by reducing thickness t f, keeping b the same. Personal pictures taken on field trip to twitchell creek bridge july 2009 5. 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. Optimization of plate girders abspoel 2014 steel construction. 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. 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. Neither of these two situations is covered in part 1.
The depth between the outer surfaces of the flanges is termed as overall depthdo or depth of the plate girder. Strength limit state interior girder exterior girder bending moment 0. The design criteria is to strengthen the girder to obtain a. Zahn what differentiates a beam from a plate girder. Optimisation of plate girders tu delft repositories. The increase in demand, and our commitment to meeting our customers requirements in the matters of quality and timeliness. G student 2assistant professor 3professor 1,2,3department of civil engineering 1,2amrutvahini college of engineering, sangamner, india 3g. Larger girders 1 m3 feet deep or more are made as plate girders, welded or bolted together from separate pieces of steel plate.
Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Hs20 live load rating factor equal to or greater than 1. Design considerations for steel plate girder bridges. Plate girder bridges details and design requirements. As the name suggests this design plate girder spreadsheet can design plate girders.
Design to ec3 part 15 nanyang technological university. Analysis and design of plate girder and box girder test. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. Preferred practices for steel bridge design, fabrication, and. Assume case 1 follow procedure of design of plate girder.
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. A girder is deemed as being hybrid when it is fabricated using different steel grades for the flanges and web panel. 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. Lrfd steel girder superstructure design example lrfd. When the gantry is not laterally supported, the equation to be used to select a trial section is as follows. Use a36 steel and assume the girder has continuous bracing for its compression flange. Girder designs must meet the following requirements. Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18. Numerical analysis of buckling strength of welded plate girder with corrugated web plate girder mr. Typical highway bridge cross section design forces and stresses a composite girder must be analyzed under several different loadings depending upon the construction method. Threeand fourspan continuous girder units are preferable. 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. Plate girder design using lrfd american institute of steel.
The track is on an 8 curve, for which the maximum design speed is 30 mih. Design guidelines for steel trapezoidal box girder systems 6. However, for plate girder roadway bridges the range may be extended to. An influence line analysis is required for truck loads. Flange design flange is a solid plate of width b and thickness t f. Design plate girder spreadsheet computerized civil engineer. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. 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. In plate girder, the web is always slender, as dt w 126. Design considerations for steel plate girder bridges the texas. 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.
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. 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. Pdf design of plate girders miftakhu zaim academia. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Plate girders ii generally the thickness of flange plates is not varied along the spans for plate girders used in buildings. 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.
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