Design step 5 design of superstructure prestressed. New project automatically leads the user through the girder system layout wizard upon the selection girder. Design guidelines for steel trapezoidal box girder systems. Hence structural analysis will be perform by developing solid model on catia and fea software. The term girder is often used interchangeably with beam in reference to bridge design.
The example was specifically selected from aisi so that a cost. To design prestressed girders using line girder analysis. Its meant to enable quick and easy construction of web applications that have some or all of the. Analysis and design of composite steelgirder bridge tutorials. The rails over the gantry girder are firmly fixed to the girder by bolted clamps or hook at a spacing of 0. The work of this study included the development of an analytical procedure for the evaluation of. The proposed system of design with varying cross sectional shape with trapezoidal web is shown in figure. Design of gantry girders velammal college of engineering. Steel tub girder, steel box girder, lateral bracing.
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. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. This design example was edited in 2012 by hdr engineering, inc. 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.
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. A beginners guide to simple plate girder design to ec3 part 15. A very light design may promise a low first cost, but could give rise to large maintenance costs resulting from a need for frequent repairs. Design of prestressed concrete girder bridge request pdf. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. Use is made of a computer program to compare the behaviour of.
Title and subtitle design aids of nu igirder bridges 2. Posttensioned box girder bridge an analysis approach using. Design example 37 b s d i lrfd negative moment loading article 3. Use features like bookmarks, note taking and highlighting while reading design of bridge structures, 2nd ed. Girder is a free and open source webbased data management platform developed bykitwareas part of theresonant data and analytics ecosystem. 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. Design step 5 design of superstructure prestressed concrete. If you need to print pages from this book, we recommend downloading it as a pdf. Design a welded plate girder 24 m in effective span and simply supported at ends. Girder is both a standalone application and a platform for building new web services. The gantry girder is subjected to bending in vertical plane as well as in horizontal plane along with. Design procedure prestressing reinforcement except for the determination of the governing live load plus impact moment, the design of the prestressing reinforcement for. Final design chapters 7, 8, and 9 of the posttensioned box girder design manual focus on final design. Dc1 loads applied to the noncomposite steel sec tion and dc2 and dw loads applied to.
Characteristics design of gantry girder is a classic example of laterally unsupported beam. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. The advantage in using an allsteel configuration is that the whole cross section, including parapets, can be fabricated at the works for delivery and erection in complete spans. 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. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. Good design must take into consideration all costs during the design life of the crane installation. In modern girder steel bridges, the two most common shapes are plate girders and boxgirders. 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. This document is disseminated under the sponsorship of the u. Introduction box girders have become a prominent element in the con.
A twospan bridge example is used here to illustrate the design steps in detail. Fortunately there is a full worked example in p3853, which is scis publication on the design of steel beams in torsion. Keywords box girder, optimization, bending stress, stru ctural analysis, finite element analysis. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 549 sample calculations at 54 ft. Analysis and design of prestressed box girder bridge by irc. This document is a standard developed by the aashtonsba steel bridge collaboration. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5.
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 simplysupported, posttensioned concrete girder shown in fig. Design of prestressed concrete igirder bridge superstructure. A numerical worked example would help, as the correspondence in verulam notes. These structures detailing manual examples are provided in pdf documents. Example 2 is precisely the case under consideration a gantry girder, except the selected member is a ub with no plate. Overview of reinforcedconcrete boxgirder bridgedesign capability. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Assume case 1 follow procedure of design of plate girder. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Twospan december 2015 continuous straight composite steel igirder bridge 6. Boundary conditions considering crane parked at one position and lifting the load is the usual recommendation for crane operation.
Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010 support to the implementation, harmonization and further development of the eurocodes y. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. Concrete boxgirder bridge design per aashto lrfd 2007. Extend bearing stiffeners the full height of the girder. Lrfd steel girder superstructure design example lrfd.
View initial results incanvas or purchase detailed girder design documentation in pdf. In the example below, the girder group 2 right exterior girder is. Main girder beam design and finite element analysis of 2x160 ton gantry crane, ismail gerdemeli et al. It carries an uniformly distributed load of 100 knm.
Appendix i design example integral steel boxbeam pier. Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. The formulation is very general and includes a variety of design options such as. Title and subtitle impact of lrfd specifications on design of texas bridges volume 2.
Introduction the specifications of overhead cranes cannot be standardized as the requirements of each firm depends on various factors. Unfortunately, this book cant be printed from the openbook. 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. Impact of lrfd specifications on design of texas bridges. Dc1 loads applied to the noncomposite steel sec tion and dc2 and dw loads applied to the longterm composite 3n 24 section. Formula 5 may seem too complicated for design purposes. Optimization of box type girder of overhead crane for. E1 is fully restrained against lateral buckling throughout its span. In addition, a design example for a twospan plate girder superstructure is included.
Department, sri vasavi institute of engineering and technology, andhra pradesh. A download it once and read it on your kindle device, pc, phones or tablets. 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. Title and subtitle design guidelines for steel trapezoidal box girder systems 6. For example, the aisc manual includes a table of beam shear, moment, deflection, and. Analysis and design of prestressed box girder bridge by. Structures design office structures detailing manual examples.
If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. The impact factor i corresponds to 50 divided by span length plus 125, but is limited to a value of 0. Chapter 14 prestressed concrete girders transport and main. Appendix b example problems transportation research board. The span is 36 m and carries two concentrated loads as shown in fig. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. From girder end midspan of noncomposite beam girder top stress. Boundary conditions considering crane parked at one position and lifting.
This thesis focuses on the applications of these rules to develop a model design example for use by bridge engineers. Superstructure live load reactions for substructure design. 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. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Rail height mm effective length factor typical span crane step size m dead load factor live. Part i includes design guidelines, plates, and administrative procedures intended to promote consistency and. Longitudinal superstructure analysis and design are addressed in chapter 7. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. 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. Design optimization of box type girder april 2015 ijst, transactions of mechanical engineering, volume 39, number m1 103 3. Precast, prestressed girder design example pgsuper training 242020 1. 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. Posttensioned box girder bridge an analysis approach.
Analysis and design of composite steelgirder bridge. Structural steel 1 of 18 rev plate girder design project. Guidelines for computer modeling of posttensioned box girders are presented in this chapter. The design of crane girders new steel construction. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Design examples of seismic retrofits of normal bridges. New modified design must have sufficient strength and capability to reduce the accordion effect. 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.
A heavy gantry girder consists of a plate girder along with a surge girder fig. Structural steels steel bridges are fabricated and constructed with steel elements that are produced at two different types of steel mills. For this design example, a conventional line girder analysis program was used to determine dead load forces and reactions. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. Design to ec3 part 15 nanyang technological university. Report date steel bridge design handbook design example 2a. Lrfd design of double composite box girder bridges purvik patel abstract conventional continuous steel bridges only exhibit composite behavior in the positive.
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