Four lrfd design examples of steel highway bridges, vol. Mar 19, 2014 click on a datetime to view the file as it appeared at that time. The gantry girder is designed on the assumption that either of the horizontal forces, transverse to the rails or along the rails, act the same time as the vertical loads including the impact load. A typical example is, because of a previously determined large span between columns, to use higher concrete class in the design of columns, while. For this design example, a conventional line girder analysis program was used to determine dead load forces and reactions.
A twospan bridge example is used here to illustrate the design steps in detail. Lrfd design example for steel girder superstructure bridge fhwa. 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. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. From the results, it is found that the warping constant of the i girder with corrugated webs is larger than that of the i girder with flat webs, while the shear modulus of the corrugated plates is smaller than that of the flat plates.
Design example 37 b s d i lrfd negative moment loading article 3. Department, sri vasavi institute of engineering and technology, andhra pradesh. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Keywords box girder, optimization, bending stress, stru ctural analysis, finite element analysis. Analysis and design of prestressed box girder bridge by irc. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 539 for each group, the stress in the prestressing strands is assumed to increase linearly from 0. Optimization of box type girder of overhead crane for.
Span of the gantry girder m effective length of its compression flange m spacing between wheels on gantry girder m crane capacitylifting load tons unfactored. Posttensioned box girder bridge an analysis approach using. Rail height mm effective length factor typical span crane step size m dead load factor live load factor combined load factor. The following design steps are included in this example. Final design chapters 7, 8, and 9 of the posttensioned box girder design manual focus on final design. If you need to print pages from this book, we recommend downloading it as a pdf. Lrfd steel girder superstructure design example lrfd. Two simply supported, welded, throughplate girders carry the single track of a railroad bridge on an 86ft span fig. The gantry girder is subjected to bending in vertical plane as well as in horizontal plane along with. Characteristics design of gantry girder is a classic example of laterally unsupported beam. Structural steel 1 of 18 rev plate girder design project. Matthews date 10601 page c1 superstructure design box girder design. E1 is fully restrained against lateral buckling throughout its span.
Formula 5 may seem too complicated for design purposes. A numerical worked example would help, as the correspondence in verulam notes. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. 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. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. 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 igirder bridge. Figure 3 example of detailed chart using strength design method. A twospan continuous composite igirder bridge has two equal spans of 165 and a 42 deck. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Design step 5 design of superstructure prestressed. Interaction of the various components considers the design and detailing of the rail the girder, the horizontal girder or surge plate and columns and founda tions. Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18.
A beginners guide to simple plate girder design to ec3 part 15. Precast, prestressed girder design example pgsuper training 242020 1. Use is made of a computer program to compare the behaviour of. Performing organization name and address center for transportation research. This is a front end, actual program is available with the software. The track is on an 8 curve, for which the maximum design speed is 30 mih.
Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design. Appendix i design example integral steel boxbeam pier. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. Sep 25, 20 the files attached include a csibridge model and a detailed pdf which documents the modeling and verification procedures for a composite steel girder bridge design based on the example published in the lrfd design example for steel girder superstructure bridge fhwa nhi04041 by fhwa in november 2003. In addition, a design example for a twospan plate girder superstructure is included. Steel girder design example using 3rd edition aashto lrfd. Design of plate girder design of plate girder design principles design inputs span l, loadings, depth and width internal forces bmd and sfd bending resistance effective width method effective section area, a eff effect second moment of area, i eff elastic modulus w eff m y,rd modifiedflangesonly method. Using of softwares for the design of bridges is much better than the manual procedure. For this steel girder design example, a plate girder will be designed for an hl93 live load.
The simplysupported, posttensioned concrete girder shown in fig. Industrial buildingsroofs to anchor rods 2nd edition aisc design guide 7 cmaa 7004 specifications for top running bridge and gantry type multiple girder electric overhead traveling cranes cmaa 7004 crane data select design code. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. 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 losses, concrete. Crane capacity 200kn selfweight of the crane girder excluding trolley 200kn selfweight of the trolley, electric motor, hook, etc. Introduction the specifications of overhead cranes cannot be standardized as the requirements of each firm depends on various factors. Design step 5 design of superstructure prestressed concrete. Introduction box girders have become a prominent element in the con. This design example was edited in 2012 by hdr engineering, inc. 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. Design to ec3 part 15 nanyang technological university. Extend bearing stiffeners the full height of the girder.
Design of prestressed concrete girder bridge request pdf. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. Design a gantry girder to be used in an industrial building carrying a manually operated overhead traveling crane for the following data. Example 2 is precisely the case under consideration a gantry girder, except the selected member is a ub with no plate. Design aids of nu igirder bridges nebraska department of. Design procedure prestressing reinforcement except for the determination of the governing live load plus impact moment, the design of the prestressing reinforcement for. The design process and corresponding calculations for steel igirders are the focus of this example. Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary task order dtfh6102t63032 us customary units submitted to the federal highway administration prepared by modjeski and masters, inc. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. 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 recommended reading. Design guidelines for steel trapezoidal box girder systems 6. In modern girder steel bridges, the two most common shapes are plate girders and boxgirders. Precast prestressed concrete igirder bridges have become the most dominate bridge. Guidelines for computer modeling of posttensioned box girders are presented in this chapter.
Dc1 loads applied to the noncomposite steel sec tion and dc2 and dw loads applied to the longterm composite 3n 24 section. The design of crane girders new steel construction. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Authors seongyeong yang, todd helwig, rich klingner, michael engelhardt, and jeremiah fasl 8. Analysis and design of prestressed box girder bridge by. With the help of the overhead cranes, heavy equipment selection from design of steel structures book. Longitudinal superstructure analysis and design are addressed in chapter 7. Girder definition is a horizontal main structural member as in a building or bridge that supports vertical loads and that consists of a single piece or of more than one piece bound together. Unfortunately, this book cant be printed from the openbook. Truss girder rail bridge worked example 1 made by sssr date 8 structural steel design project calculation sheet checked by vk date fig. Design step 2 example bridge prestressed concrete bridge design example 8 reinforced concrete deck 110 18 14 5 spa at 9 8 9 55 4 12 total width 52 roadway width figure 22 bridge crosssection 2. Analysis and design of composite steelgirder bridge.
Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. 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. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Design guidelines for steel trapezoidal box girder systems. Comprehensive design example for prestressed concrete. Fortunately there is a full worked example in p3853, which is scis publication on the design of steel beams in torsion. The term girder is often used interchangeably with beam in reference to bridge design. Example calculations designing for fabrication optimization. The impact factor i corresponds to 50 divided by span length plus 125, but is limited to a value of 0. Design of prestressed concrete igirder bridge superstructure. Analysis and design of plate girder and box girder test. Impact of overhang construction on girder design 5. Steel bridges ii structural steel rev design project.
Impact of lrfd specifications on design of texas bridges. A typical example is, because of a previously determined large span between columns, to use higher concrete class in the design of columns, while following the uls and sls criterias, defined with. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete.
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