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. The folded steel plate girder, or fspg, is an economical alternative for simple and short span bridge construction. 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. Introduction ence 710 university of maryland, college park. The steel for the flanges and web plates is of grade fe 410. Pdf the behaviour of plate girders under in plane loading has been intensively studied. Design guidelines for steel trapezoidal box girder systems 6. It is the main horizontal support of a structure which supports smaller beams.
Today, welding is the primary joining process in steel bridge. Having provided the framework for combining the individual fea results, the application of these loads to the models themselves can be discussed. Civil and environmental engineering department university of maryland 2 introduction following subjects are covered. For threeand fourspan continuous girder units make interior spans about. What we do, were going to choose a steel plate girder bridge. Constructibility checks, stiffener and shear connector designs are also. Continuous straight composite steel igirder bridge. Projects cdr bridge systems folded steel plate girder. Manual for roads and bridges and for railway bridges reference has to be made to.
Diaphragms crossframes throughgirders the beam or girder is fully braced at a location if twist is prevented. Astm a 709 grade hps 70w for flanges in negativeflexure regions astm a 709 grade 50w for all other girder and crossframe steel concrete. Guidelines and tutorial for modeling haunched steelgirder bridges. Pdf in the present paper, the effect of multiple longitudinal web. E1 is fully restrained against lateral buckling throughout its span. Effect of multiple longitudinal stiffeners on ultimate. This section is intended to provide general design guidance and information on detailing practices. Design considerations for steel plate girder bridges. A practical approach to design for efficient fabrication. Design guidelines for steel trapezoidal box girder systems. Saves the bridge description in this window and its tabs to memory and closes the window. A detailed and extensive procedure which describes the modeling, analysis, and design of a 3d steelframe pipe rack system.
This tutorial provides an introduction to the assignment of joint patterns. Pdf effect of multiple longitudinal stiffeners on ultimate strength of. These types of structural elements are particularly attractive because of their high torsional. The existence of larger kettle sizes has made it possible to hotdip galvanize larger girders and trusses for bridge construction. If you select this option, the program will evaluate articles 6. Third edition of the aisc lrfd manual of steel construction. Yield stress of steel, fy 250 nmm 2 material factor for steel. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. Structural steel design project calculation sheet checked by pu date 250400 problem.
Im just going to type in 700, of course i can graphicallyselect it as well. 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. Pdf innovative steel plate girders with corrugated webs. 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. In rare instances integral pier caps or substructures will be designed using steel. This report describes the study conducted on a steel plate girder bridge which carries. Aii why transverse stiffeners are provided in a plate girder. The fatigue resistance of the base metal at the weld joining the bracing connection plate located. These tasks will allow you to generate a full 3d finite element model of a steel plate girder bridge and then load this bridge for code based loading scenarios. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. For standard roadway widths, plate girders are spaced 8. Larger girder spacings up to 12 feet are considered on a casebycase basis.
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. 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. Preferred practices for steel bridge design, fabrication. A hamzontal trust formed joining the bottom chords of the two r es with laterals fig. A new take on plate girders american institute of steel. Torsional bracing of beams brace stiffness and strength requirements 6 aisc specification appendix 6 bracing provisions. A girder is deemed as being hybrid when it is fabricated using different steel grades for the flanges and web panel. Structural steel 1 of 18 rev plate girder design project.
The merge utility in abaqus creates a single combined mesh from the various partsinstances. Typical cwpg superstructures are designed with four or five plate girders and cross frame or kframe diaphragms. Moment strength shear strength intermediate transverse stiffener bearing stiffener reading. The steel girders are usually fabricated isection plate girders. Four span simply supported steel plate girder input. 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. Steel bridge design handbook fhwa us department of. Threespan december 2015 continuous horizontally curved composite steel igirder bridge 6. A hybrid plate girder utilizes high strength steel for the flanges and comparatively low strength steel for the web panel. Threeand fourspan continuous girder units are preferable.
Design to ec3 part 15 nanyang technological university. Plates and welds shall be detailed with square ends weld across the ends. Presence of holes in steel plate change the structural behaviour of steel plate. The innovative yet simple design has a long service life, requires little maintenance, and is planned for accelerated project delivery. Finally the results indicate that by adding not more than four stiffeners at the web of a steel plate girder subject either.
However, distortion of structural elements during and immediately after the galvanizing process remains a concern, especially with welded steel plate girders. Select steel girder types girder spacing approximate girder depth check vertical clearance yes no return to main flowchart plan for bridge aesthetics s2. In some cases, the plate girders may be formed in a zshape rather than ishape. Since being pioneered in france in 1986, prestressed concrete girder bridges with corrugated steel webs have emerged as one of the most promising forms of steelconcrete composite bridges. 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.
Manual for inspecting bridges for fatigue damage conditions, final. The design process and corresponding calculations for steel igirders are the focus of this example, with particular emphasis placed on illustration of the optional moment redistribution procedures. Plate girders be made shallcomposite with the bridge deck be and should continuous over interior supports where applicable. Personal pictures taken on field trip to twitchell creek bridge july 2009 5.
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