Plate girder bridges details and design requirements. The various analysis nuances that can affect the results of a steel bridge analysis, and the implications of variations in the results of a steel bridge analysis. When the span and load combination is such that the rolled steel beams become insufficient to furnish the requirement and builtup beam becomes uneconomical, then plate girders are used. Office policy for concrete and steel bridge design is as follows. Concrete bridges semiintegral design is used for prestressed concrete girder bridges under 450 feet long and for posttensioned spliced concrete girder and castinplace post. Pdf files civil engineering, design of plate girder, pdf, pdf of pate girder, plate girder, plate girder design steps pdf, plate girder pdf, plate girder solved example pdf, technical civil post navigation. Steel plate girder bridge design using indian standard method and british standard method by nur afifah binti azemi a peoject dissertation submitted to the civil engineering programme universiti teknologi petronas in partial fulfilment of the requirement for the bachelor of engineering hons civil engineering approved by. 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. The required design input at the strength limit state is shear force. A girder bridge is a bridge that uses girders as the means of supporting its deck. Crane girder is an assembly of steel plates, angle and rails. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification.
Steel bridge design handbook fhwa us department of. Let the crosssection of the deck be assumed as shown in fig. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. The girder is to be strengthened due to section loss from corrosion. The superstructure design includes the following elements. The design criteria is to strengthen the girder to obtain a.
Key words igirder, curved bridge, lifting, erection, construction 18. Loading single lane of class 70r or two lanes of class a. Design of plate girders for deck type railway bridges. To achieve economy in the fabrication shop, all girders in a multigirder bridge should be identical where possible. Extend bearing stiffeners the full height of the girder. Steel plate girder bridge design using indian standard. A deck type plate girder bridge for single meter gauge track and standard main loading.
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. Design, analysis and optimization of crane girder via. Abstractplate girder bridges are the most common type of steel bridges generally used for railway crossing of streams and rivers. Wisdot bridge manual chapter 24 steel girder structures july 2019 241. Chances are very high that today, a bridge engineer will learn how to design a bridge girder before any other bridge type. Zahn what differentiates a beam from a plate girder. These bridges replace the existing structures carrying us route 52 and ashley phosphate road over i26. All field connections, including splices, shall be bolted connections unless otherwise specified by the district bridge engineer. The primary goal of the collaboration is to achieve steel bridge design and construction of the highest quality and value through standardization of the design, fabrication, and erection processes. Some of these issues relate to not following the txdot. The deck may consist of 3 girders spaced at 2, 45 m. This article presents highlights of the structures design and construction. Hs20 live load rating factor equal to or greater than 1.
Pdf this study concerns with finding the geometric dimensions of a plate girder which minimize. Plate girder design using lrfd university of maryland. Hirol, isami, plategirder construction, isbn 9780554888026. The program is unique because it optimizes plate girder designs on the basis of least cost, not least. 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. Continuous straight composite steel igirder bridge.
Mar 22, 2018 this feature is not available right now. The significance of these items can be seen in the lrfd manual flowcharts figs. Design considerations for steel plate girder bridges the texas. With depth of web to thickness of web ratio remains the same, flange area varies as per the variation of span.
Steel plate girder bridge design using indian standard method. The existing bridge was designed for hs20 live loading. Earth tech decided on twospan continuous steel plate. Center to center span of main girder 24m, provided at a spacing of 1.
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. Steel plates are also used as diaphragms of the girder. Basically the indian standards are derived from the british standards. With these flowcharts, this discussion will focus on the design of plate girders according to lrfd. Pdf design of plate girders miftakhu zaim academia. Bridge and viaduct plans for model railroad and dioramas in. Recent developments in optimum design methods allow direct design of girder bridges, considering minimisation of weightcost.
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. This project outlines the design of both a steel and concrete girder system and their respective components piers, abutments, bearings, expansion joints, etc. Plate girders and rolled beams shall be made composite with the bridge deck through shear studs and should be continuous over interior supports where possible. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140.
The design shear forces and bending moments are shown in fig. Bridge and viaduct plans for model railroad and dioramas. Use a36 steel and assume the girder has continuous bracing for its compression flange. Transfer length and splitting force calculation for pretensioned concrete girders with highcapacity strands article. This chapter will cover the introduction to plate girder bridges components, factors being considered in designing plate girder bridges and the previous comparison being made on the codes provisions for bridges.
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. I270 bridge over chain of rocks canal introduction i270 is a fourlane interstate expressway that serves as a north bypass to the city of st. Design considerations for steel plate girder bridges. The basic application of the aashto lrfd bridge design specifications to the design of straight steel isection flexural members is illustrated through this design example. In this book, however, our approach is interactive. This document primarily discusses common steel girder bridge types. The design of steel structures is covered in section 6 of the aashto lrfd bridge design specifications and only straight steel bridges are covered in the provisions as of this writing. The plate girders consist of plates and angles riveted together. Kansas department of transportation bridge construction manual version 1011 kdot bridge section 1.
The two most common types of modern steel girder bridges are plate and box. A plate girder structure is selected over a rolled girder structure for longer spans or when greater versatility is required. To achieve economy in the fabrication shop, all girders in a multi girder bridge should be identical where possible. The design of steel plate girder bridges using sliding isolation. Key words i girder, curved bridge, lifting, erection, construction 18. Knight as a service to the bridge design profession, bethlehem steel has conducted hundreds of studies of steel plate girder bridges using its preliminary bridge girder optimization program. To accommodate a new lane arrangement beneath the bridge, the first interior pier was relocated nearly 10. The load effects such as bending moment and shear force are to be found using individual and unfactored load cases. They are used in building constructions and also in bridges. Wisdot bridge manual chapter 24 steel girder structures july 2019 245 24.
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. Structural steel 1 of 18 rev plate girder design project. Cover plates on plate girder flanges shall not be permitted. Bharil, in innovative bridge design handbook, 2016. 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. In rare instances integral pier caps or substructures will be designed using steel. July 2019 276 the required design input for the design of an elastomeric bearing at the service limit state is dead load, live load plus dynamic load allowance, minimum vertical force due to permanent load, and design translation. The third edition of the design specifications, to be published in 2004, will contain a complete set of new. Girder analysis and design is performed using the computer. This design example, plate girder shear and flexural strengthening i,nvolves the addition of steel strenghening material to an existing steel plate girder.
As early as 1847, plate girder span were built for small railroad bridges. The use of girder as a natural bridging element is abundantly evident in nature, such as a fallen tree trunk over. Adeli and mak 1990 present minimum weight design of plate girder bridges subjected to moving loads. Personal pictures taken on field trip to twitchell creek bridge july 2009 5. The computation of the stresses in any structure is the preliminary step in the design. Introduction in 1993, the american association of state highway and transportation officials aashto adopted the load and resistance factor design lrfd specifications for bridge design.
Plate girder bridge is designed as per the limit state method using the is 800. These girders were builtup members, fabricated of riveted shapes. Generally rolled girders are used for web depths less than 36. Crane girder design crane girder details proper detailing is the key to good fatigue performance the vast majority of crane girder performance issues occur at the crane girder to column connection. Design of plate girders for deck type railway bridges ijiet. This design example was edited in 2012 by hdr engineering, inc. Lrfd 3rd edition threespan continuous straight igirder 1. Recently many steel plate girder bridges have had design and construction issues. Wisdot bridge manual chapter 24 steel girder structures.
Steel plates forms the flange and web of girder while the angle forms the stiffening part of the web plate. I270 carries a significant number of daily commuters between illinois and missouri with an average. Only the superstructure design of the two concrete alternates will be covered in this article. 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. Girder bridges are the most natural and simplest form of bridging between two points. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. Design of plate girder pdf february 22, 2019 february 22. Plate girder shear and flexural strengthening design. Straight bridges where one or more support lines are skewed more than 20 degrees from normal. When using plate girders, a minimal number of plate sizes should be used.
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