This is the former herkimer, newport and poland narrow gauge bridge over west canada creek. Preferred practices for steel bridge chapter 1introduction design, fabrication, and erection. The innovative yet simple design has a long service life, requires little maintenance, and is planned for accelerated project delivery. Understanding how a girder is different from a beam is a necessary skill for any builder, engineer, or construction worker.
A hybrid plate girder utilizes high strength steel for the flanges and comparatively low strength steel for the web panel. Girders are the main horizontal supports of a structure, and support smaller beams. For economy and ease of fabrication, exterior and interior girders should use the same plate sizes. Welds line stylespatterning number required under title 4. 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. Lrfd design example for steel girder superstructure bridge. 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.
In a plate girder bridge, the plate girders are typically ibeams made up from separate structural steel plates rather than rolled as a single crosssection, which are welded or, in older bridges, bolted or riveted together to form the vertical web and horizontal flanges of the beam. Steel plate girder bridge design using british standard method. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. Steel plate girder bridge design using indian standard. The depth between the outer surfaces of the flanges is termed as overall depthdo or depth of the plate girder. Preferred practices for steel bridge design, fabrication. Cl stress modification coerficient depending on 01.
Lrfd 3rd edition threespan continuous straight igirder 1. Im just going to type in 700, of course i can graphicallyselect it as well. Jun 16, 2016 this video is about my first steel bridge design which started 56 years ago, developed into a commercial product and finally when my layout was complete, i added one for myself as well. Fabrication of steel plate girder r linkedin slideshare. 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. 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. In plate girder, the web is always slender, as dt w 126. Numerical analysis of buckling strength of welded plate. Join josh modglin for an indepth discussion in this video, steel plate girder bridge, part of infraworks 2019 essential training.
Folded steel plate girders what is a folded steel plate girder fspg. 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. For future widening the exterior girder is required to have at least the same capacity as an interior girder aashtolrfd 2. Steel beam with timber deck superstructure standards ss8 it is expected that the users of this chapter will adhere to the practices and requirements stated herein. Owner new york state thruway authority designbuild team tappan zee constructors. Job title xx bs5950 intermediate stiffener dimensions. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. However due to their strength and redundancy, relatively few deck plate girder bridges have failed. After a brainstorming session, the designbuild team selected a composite single steel box girder. 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. As wide a flange plate as practical should be used, consistent with stress and flange widththickness ratio, b t, requirements. Tappan zee plate girder approach erection project participants. A girder bridge is a bridge that uses girders as the means of supporting its deck.
The folded steel plate girder, or fspg, is an economical alternative for simple and shortspan bridge construction. The curtailment of the thicker plate is made by reducing thickness t f, keeping b the same. However, some authors define beam bridges slightly differently from girder bridges. Steel plate girder bridge linkedin learning, formerly. In this video, were going to create a steel plategirder bridge and were going to see that we havejust as many settings. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. The two most common types of modern steel girder bridge are plate and box. 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 use of plate girders gives scope to vary the girder sections to suit the loads carried at different positions along the bridge. The term girder is often used interchangeably with beam in reference to bridge design.
Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions. What we do, were going to choose a steel plate girder bridge. 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. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. The weight of the structural steel for the plate girder option was more than 900t.
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. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. Design plate girder spreadsheet computerized civil engineer. Four span simply supported steel plate girder input. The designer is free to choose the thickness of web and size of flange to suit the internal forces at different positions along the length of the span, though it must be remembered that too many changes may not lead to economy, because of the additional. In multigirder construction, a number of similarly sized longitudinal plate girders are arranged at uniform spacing across the width of the bridge, as shown in the typical cross section below. When the gantry is not laterally supported, the equation to be used to select a trial section is as follows. Instructor weve already createda precast concrete girder bridgeand we saw all the different settings thatgive us control over the design of the bridge. Numerical analysis of buckling strength of welded plate girder with corrugated web plate girder mr. A girder is deemed as being hybrid when it is fabricated using different steel grades for the flanges and web panel. 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. For threeand fourspan continuous girder units make interior spans about.
Refer to design step 1 for introductory information about this design example. Northern railway northern railway, the jewel set in the crown of indian railways. It is the main horizontal support of a structure which supports smaller beams. Plate girder shear and flexural strengthening design. For curved girders, the minimum flange thickness is 1 in. Diaphragms crossframes throughgirders the beam or girder is fully braced at a location if twist is prevented. Abstract this paper describes a calculation method for steel plate girders with transverse web stiffeners subjected to shear. Faqs instructor weve already createda precast concrete girder bridgeand we saw all the different settings thatgive us control over the design of the bridge. Check the web thickness check the web thickness as per cl. 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. Extract the demands for maximum shear force and maximum bending moment in the plate girder calculate the optimum thickness and depth of the web.
This document provides guidance to help steel bridge designers working on texas department of transportation txdot projects. In general, depth of the plate girder is kept 110 th to 112 th of the span. The deck slab spans transversely between the longitudinal girders and cantilevers transversely outside the outer girders. 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 sofistik rhinoceros interface 2020. Preferred practices for steel bridge design, fabrication, and. Developed at the university of nebraskalincoln, the girders are fabricated from a single steel plate of uniform thickness that is bent along multiple lines using a hydraulic metal press brake, forming a trapezoidalshaped section that is open at the bottom. For this steel girder design example, a plate girder will be designed for an hl93 live load. 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. Plate girder design using lrfd american institute of steel. 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 definition of plate girder by merriamwebster. Steel girders have vertical plates welded to the webs called stiffeners.
This video is about my first steel bridge design which started 56 years ago, developed into a commercial product and finally when my layout was complete, i added one for myself as well. Design guidelines for steel trapezoidal box girder systems. Strength limit state interior girder exterior girder bending moment 0. The folded steel plate girder, or fspg, is an economical alternative for simple and short span bridge construction. Design considerations for steel plate girder bridges. The minimum flangeplate size for a plate girder is 12 in. Gusset plate callout wthickness, height, and length angle member dimensionscallouts wbeam callout wlength alternate welded connection detail callout fill plate callout girder no. Two girder assemblies or three girder assemblies 410 long or 350 long or 290 long curved or straight girders 210 girder spacing or 189 girder spacing 24 general types of preassemblies weights 900 to 2200 kips all equipment designed for project had to accommodate all different types of preassemblies. Design guidelines for steel trapezoidal box girder systems 6. Saves the bridge description in this window and its tabs to memory and closes the window. The following american association of state highway and transportation officials. Units 1 to 7 and units 8 to 9 are plate girder spans each unit is a 5 span continuous plate girder each span is.
A plate girder is subjected to a maximum factored moment of 4000 knm and factored shear force of 600 kn. Flange design flange is a solid plate of width b and thickness t f. Threeand fourspan continuous girder units are preferable. Assume case 1 follow procedure of design of plate girder. There it is, a deck plate girder bridge, the 1884 minneapolis bnsf rail bridge.
Optimization of steel plate girders in bending tu delft repositories. Several major changes andor additions to the past office practice part 2 are as follows. Design example 312 b s d i structural analysis summary liveload distribution factors. As the name suggests this design plate girder spreadsheet can design plate girders. The design may be based on any one of the following assumptions. This innovative yet simple model has a long service life, requires little maintenance, and is designed for accelerated project delivery. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Using femanalyses on s690 and s890 steel plate girders. You may hear the words girder and beam used interchangeably, but important differences distinguish the two from one another. Structural steel 1 of 18 rev plate girder design project. Optimisation of plate girders tu delft repositories.
In some cases, the plate girders may be formed in a zshape rather than ishape. Were going to take a look at a few other settingsweve never looked at with our precast. G student 2assistant professor 3professor 1,2,3department of civil engineering 1,2amrutvahini college of engineering, sangamner, india 3g. Lrfd steel girder superstructure design example lrfd. 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. Design to ec3 part 15 nanyang technological university.