A sample input file and selected excerpts from the corresponding output file are included in this document. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. This publication presents worked examples of the detailed design of two composite highway bridges. Plate girder bridges details and design requirements. Arif memon assistant professor civil engineering department, laxmi institute of technology, sarigam chartered engineer, amie be civil, m. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Therefore, the purpose of this paper is to present information relative to the design criteria in addition to information on pre liminary plate sizes, design aids, and computeraided design of steel box girder bridges. Calculates cumulative stresses at critical locations for loads applied to noncomposite and composite sections.
Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. Comments the granite curb was modeled as a parapet appurtenance separate from the concrete parapets to. The first task, analysis and design of horizontally curved plate girder and. Approximate analysis of horizontally curved girder bridges by ann l.
Pdf design of plate girders miftakhu zaim academia. Calculates noncomposite and composite for modular ratios n and 3n section properties for steel igirders with concrete deck. The macros carry out calculations using values from specific cells in the. Analysis and design of composite steelgirder bridge. 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 design shear forces and bending moments are shown in fig. The design may be based on any one of the following assumptions. Distribution statement bridge design, steel girder, load and resistance factor this report is available to the public from the design, lrfd, concrete deck, bolted field splice, national technical information service in. Repair of steel beamgirder ends with ultra highstrength concrete phase ii spr 5. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Design verifications 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 two programs will match exactly of course.
For curved girders, the minimum flange thickness is 1 in. The design output includes deflection, bending moment and shear force diagrams, and calcsheets with detailed calculations. Girder system design project procedures the first task in a girder system design project is to establish the framing plan of the girders and bracing in layout mode the menu system starts in this mode in girder system projects. Simple span plate girder example aashtoware bridge. Sample specifications for new single family detached homes.
The new hampshire department of transportation nhdot makes these documents available on an asis basis. It is a companion to a publication giving general guidance on composite highway bridge design. These design and assessment spreadsheets were written using microsoft excel 2000 and 2010 and they contain macros. Plate girder shear and flexural strengthening design example. Authors arash esmaili zaghi, kay wille, kevin zmetra, kevin mcmullen, dominic kruszewski, and alexandra hain 8.
The first example is of multi girder form, the second is of ladderdeck form. Examples to eurocode steel design to en 1993 bs en page. Preferred practices for steel bridge design, fabrication. Plate girder design process cee462 steel structures ii. View notes plate girder design process from cee 462 at university of illinois, urbana champaign.
Introduction box girders have become a prominent element in the con. Characteristics design of gantry girder is a classic example of laterally unsupported beam. Cee462 steel structures ii summary of plate girder design process 1. Crane girder design 5 crane column cap plates allow girder end rotation avoid thick cap plates place the bolts outside of the column flanges. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. With these flowcharts, this discussion will focus on the design of plate girders according to lrfd. The bureau of bridge design has assembled sample plans and bridge plan checklists that can be used as an aide in the preparation of detail construction plans for bridges. As wide a flange plate as practical should be used, consistent with stress and flange widththickness ratio, b t, requirements. Plate girder buckling bending free 30day trial scribd.
The minimum flangeplate size for a plate girder is 12 in. From the bridge explorer, select filenewnew bridge from the menu. Plate girder bridges details and design requirements plate girders became popular in the late 1800s, when they were used in construction of railroad bridges. 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. Cl stress modification coerficient depending on 01. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Lrfd 3rd edition threespan continuous straight igirder 1. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. Tech structure 1 a girder is a flexural member which is required to carry heavy loads on relatively long spans. Steel plate girder bridge design using indian standard. E1 is fully restrained against lateral buckling throughout its span. Design considerations for steel plate girder bridges.
Aas hto m2 7 0, g ra d e 5 0 w u n c o a te d we a th e rin g s te e l with f y 5 0 ks i. Folded steel plate girder system applications in accelerated bridge construction aashto scobs technical committee for structural steel design t14 annual meeting april 20, 2015 by. Analysis and design of plate girder and box girder test. 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. Design to ec3 part 15 nanyang technological university. Personal pictures taken on field trip to twitchell creek bridge july 2009 5. 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. Neither of these two situations is covered in part 1. Calculates cumulative stresses at critical locations for loads applied to. Dec, 2012 plate girder for efficient design it is usual to choose a relatively deep girder, thus minimizing the required area of flanges for a given applied moment, msd. Steel tutorial aashtoware bridge design and rating products. An example of application shows a good agreement with the developed formula. Formula 5 may seem too complicated for design purposes.
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. The sample specifications cover many but not all aspects of the 2006 kentucky residential code krc. A beginners guide to simple plate girder design to ec3 part 15. 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. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. In its simplest form a plate girder is made of two flange plates welded to a web. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. Pdf the behaviour of plate girders under in plane loading has. As the name suggests this design plate girder spreadsheet can design plate girders. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. The following american association of state highway and transportation officials. Design verifications 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 examples cover the principal steps in the verification of the. Lrfd design example for steel girder superstructure bridge. A plate girder is subjected to a maximum factored moment of 4000 knm and factored shear force of 600 kn. Plate girder design using lrfd university of maryland. Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18. It calculates the envelopes for all the required design forces inlcuding vertical loads and horizontal effects of the moving cranes, moments and deflections.
The span is 36 m and carries two concentrated loads as shown in fig. Assume case 1 follow procedure of design of plate girder. Have a well founded knowledge of design specifications. 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.
The layout of the spreadsheet should not be changed. A plate girder with fe415 plates is having 12mmx150mm web plate and 56mm x 500mm flange plates. Key words steel bridge, steel igirder, aashto lrfd, moment redistribution, cross frame design 18. Sample specifications for new single family detached homes introduction kentucky housing corporation khc has created the following sample residential construction specifications to assist you in building safe, decent, affordable housing. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. New project automatically leads the user through the girder system layout wizard upon the selection girder.
Includes project specific design criteria such as span configuration, girder configuration, initial spacing of cross frames, material properties, and deck slab design and design criteria from aashto such as load factors, resistance factors, and multiple presence factors. Plate girder a typically large beam capable of supporting large loads builtup by welding various plates together. 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. Enter the impact to be used for the entire bridge by clicking on impact in the tree and selecting fileopen from the menu. They are used to support loads over long spans 60 ft. Assumptions unknown girder haunches were assumed to be 2 inches for the entire length of each girder, which is reasonable based on bir photos 6, 7 and 10. We wanted an interior structural steel girder to be placed within the plane of the precast slab units, thereby producing a thin floor construction akin to flatplate with a minimum floor to ceiling height. 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. It is the responsibility of the designer to provide the most current details and items on the contract plans. An openstaad macro used to parametrically generate a concrete box girder outline consisting of plate elements. Repair of steel beamgirder ends with ultra highstrength. Openings are frequently required, particularly in building construction, to allow access for service ducts, etc. Introduction welded plate girders, which are the most common form of plate girders, are builtup structural steel members that consists of flange plates welded to a web plate with fillet welds.
Pin connections are common in the design of trusses. A plate girder cross section can take several forms. It gives two worked examples, one for a multi girder bridge and one for a ladder deck bridge. This publication is the second of two sci bridge design guides that reflect the rules in the eurocodes. Details and items of the sample plans may have changed. The significance of these items can be seen in the lrfd manual flowcharts figs. The plates were joined together using angles and rivets to obtain plate girders of desired size. The momentresisting capacities of plate girders lie somewhere between those of deep standard rolled wideflange shapes and those of trusses. 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. Design plate girder spreadsheet computerized civil engineer. 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. It gives two worked examples, one for a multigirder bridge and one for a ladder deck bridge.
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