Design guide for composite box girder bridges composite box girder construction offers an attractive and economic form of construction for medium span highway bridges. Design of prestressed concrete igirder bridge superstructure. 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. The design of crane girders new steel construction. Description download steel crane girder design example comments. Impact of overhang construction on girder design 5. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5. The design of gantry girder is explained in this video step by step with full procedure. Steel girder design example using 3rd edition aashto lrfd. Girder is a free and open source webbased data management platform developed bykitwareas part of theresonant data and analytics ecosystem. Posttensioned box girder bridge an analysis approach using. Guidelines for planning, analysis, design and stability of. Continental steel public seminar, 6 august 2014, ntu design of plate girder design of plate girder shear resistance if the web is stocky, no shear buckling of web shall occur and the shear strength of the web is given by ec3 part 11 if the web is not stocky, shear buckling governs the failure.
Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4. 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. Line girder analysis sample report search autodesk. Introduction in structural engineering, most concrete linear elements are designed by a simplified theory, using the bernoulli. For this steel girder design example, a plate girder will be designed for an hl93 live load. Appendix i design example integral steel boxbeam pier. Design guidelines for steel trapezoidal box girder systems. Plate girder design using lrfd university of maryland.
For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Example 2 is precisely the case under consideration a gantry girder, except the selected member is a ub with no plate. 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. Buckling verifications at internal support p1 according to vi section 10, en 1993.
Analysis and design of composite steelgirder bridge. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. A test was conducted on two lattice girder elements in order to evaluate the mechanical behaviour in bending. Llc requires design by a registered professional structural engineer. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Design and rating for curved steel i and box girder. You can easily design any plate girder on the basis of these steps with a simple process of design. Unfortunately, this book cant be printed from the openbook. Lrfd steel girder superstructure design example lrfd. Comprehensive design example for prestressed concrete. Design examples of seismic retrofits of normal bridges. Tgirder design example note the engineering community.
Department of transportation kdot is moving towards adoption of nu girder sections for inhouse projects, in addition to the consultant projects where they are already being used, there is a need for similar design aids to allow for selection of nu girders conforming to design specifications. Rail height mm effective length factor typical span crane step size m dead load factor live load factor combined load factor. In this project work the prestressed concrete girder bridge, already. In modern girder steel bridges, the two most common shapes are plate girders and boxgirders. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Saves the bridge description in this window and its tabs to memory and keeps the. Analysis and design of prestressed box girder bridge by irc. Design of prestressed concrete girder bridge request pdf. Shape sections, other than pipe and tubing, are typically available in 36, 50, or 50w grades. Step 2 retrieve interior girder sgl predictions for dead load deflection along the span, 110 or 120 points. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Structures design office lrfd design examples files pdfs fdot. However, it is a necessary and important part of plate girder design when applying the load.
Plate girder worked example 1 made by sssr date 150400 structural steel design project calculation sheet checked by pu date 250400 problem. Impact of lrfd specifications on design of texas bridges. After reading this article you will learn about the design of steel girders with the help of diagrams. I am trying to explain the basic difference between a plate girder and a gantry girder. Lrfd steel girder superstructure design example pier design example design step 8 table of contents design step 8. However, the present design method for the elements is based on empirical expressions and is believed to be over conservative. Authors seongyeong yang, todd helwig, rich klingner, michael engelhardt, and jeremiah fasl 8.
Crane girder design is an excel spreadsheet template for the design of simply supported crane girders. Design of gantry girder 2 features design of gantry girder is a classic example of laterally unsupported beam. Design step 5 design of superstructure prestressed concrete. Posts about design of gantry girder pdf written by wimackonya. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. For this example we will assume an interior girder deflection of 6 and an exterior girder deflection of 5. Horizontally curved concrete boxgirder highway bridges appendix b example problems table of contents example b1 comprehensive design example b5 spine and grillage analysis 1. Structural steel 1 of 18 rev plate girder design project.
In this video you can learn about all checks for the gantry girders, and all checks for shear and deflection calculation. Chbdc steel girder design users manual simplified bridge. Heins september, 1937 december 24, 1982 during the past decade, there has been extensive use of steel box girders for straight and curved highway and transit structures. Four span simply supported steel plate girder input.
Saves the bridge description in this window and its tabs to memory and closes the window. Report steel crane girder design example please fill this form, we will try to respond. Because this comprehensive numerical example exists, no further attention is paid to the interaction expression in this article. Zahn what differentiates a beam from a plate girder. Performing organization name and address center for transportation research. Bulb tee bridge bridge section view girder elevation view givens girder span length, l 100 ft. University of engineering and technology p h t h l peshawar lecture.
Lrfd design example for steel girder superstructure bridge. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. In this way it is possible to assess the fatigue risk to the crane and its runway girder during its design life. Example 7 girder haunch and camber 1 21 design example 7 case 1. Check web of the girder at points of concentrated load for local buckling or local crushing, and provide load carrying bearing stiffeners, if necessary. Design of gantry girders velammal college of engineering. Its meant to enable quick and easy construction of web applications that have some or all of the. Design step 2 example bridge prestressed concrete bridge design example haunch depth 4 in. Calculates cumulative stresses at critical locations for loads applied to. Formula 5 may seem too complicated for design purposes.
Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. Design to ec3 part 15 nanyang technological university. Gantry girders are laterally unsupported beams to carry heavy loads from place to place at the construction sites, mostly these are of steel material. Design of gantry girders part no 2 steel structure is. During project work considerable efforts have been endured upon analysis and design of prestressed concrete girder bridge. This chapter is intended to provide general guidance in lrfd design and detailing practices. It is the main horizontal support of a structure which supports smaller beams. This document consists of a comprehensive design example of a prestressed concrete girder bridge.
The torsional properties of the closed section are often advantageous in reducing and simplifying the support arrangements and are. Chapter 14 prestressed concrete girders department of transport. Design of continuous highway bridges with precast, prestressed concrete girders clifford l. The design process and corresponding calculations for steel i girders are the focus of this example, with particular emphasis placed on illustration of the optional moment redistribution procedures. The procedure is based on the steelwork design guide to bs 59501. Such buckling problems have to be given careful consideration in plate girder design. 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. Calculates noncomposite and composite for modular ratios n and 3n section properties for steel igirders with concrete deck. Girder is both a standalone application and a platform for building new web services. 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. Freyermuth design research section portland cement association skokie, illinois continuous highway bridges with precast, prestressed girders have been built by a number of states.
The term girder is often used interchangeably with beam in reference to bridge design. You can easily design any plate girder on the basis of these steps with a simple process of design by following our given steps in the pdf file provided below. The typical i beam when made up from different structural steel platessection instead of single rolled steel crosssection, which is welded o. One way of improving the load carrying resistance of a slender plate is to employ stiffeners lecture 8. 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. Tgirder design example note download link more from my sitetechnichal glossarie of bridge engineeringhow to choose the layout of toggle navigation.
What is difference between a plate girder and a gantry. If capacity of crane is moderate, the gantry girders rest on brackets connected to roof column of industrial shed. Crane girder design girder lacing using a truss to stabilize the top and bottom flange for lateral loads detail to avoid creating inadvertent continuity in adjacent spans consider bending in the angles due to relative vertical movement. Design of steel girders with diagram your article library.
Comprehensive design example for prestressed concrete girder. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation. Design guidelines for steel trapezoidal box girder systems 6. Plate girder design using lrfd american institute of. Interaction between bending and shear at support p1. But before watching this part, please watch the 1st part of gantry girder for better understanding. Pdf steel crane girder design example free download pdf. The gantry girder is subjected to bending in vertical plane as well as in horizontal plane along with twisting. Chapter 407 s tructural s teel this chapter addresses structuralsteel requirements in the lrfd bridge design specifications, hereafter referred to as lrfd, which may require amplification, clarification, or an improved application. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Examples of bridges of this type built by the states of tennessee and. Ikuerdesign suchasminimumthicknessofmaterialinwebplates, andminimumedgedistancesforpunching,theyfixalimit 10sizeofcertainpa. In response to the challenges of longer bridge spans and more application of highstrength concrete in future girder design, high. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type.
Milwaukee harbor bridge example for fatigue design example for fatigue design cont. After reading this article you will learn about the design of slab and girder bridges. New fhwa posttensioned box girder design manual by reggie holt, federal highway administration, and john corven, corven engineering figure 2. A twospan bridge example is used here to illustrate the design steps in detail. Lattice girder elements are used as permanent formwork in insitu concrete construction. E1 is fully restrained against lateral buckling throughout its span. The span is 36 m and carries two concentrated loads as shown in fig. The superstructure consists of two simple spans made. Finally, an example of the analysis of a bridge composed of a continuousspan, posttensioned concrete box girder superstructure and a concrete pier is also demonstrated using the approximate equivalent load method. Structural steel of primary members shall satisfy the toughness requirements for zone 3.
Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18. If you need to print pages from this book, we recommend downloading it as a pdf. It is subjected to in addition to vertical loads horizontal loads along and perpendicular to its axis. Steel plate is available in 36, 50, and 50w grades. To ensure economical design of cranes, they are normally divided into several classes depending on the frequency of their use, the average ratio of the loads lifted to the safe load, and the dynamic effects experienced in service.
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. 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. Boundary conditions considering crane parked at one. Design and rating for curved steel i and boxgirder bridge structures c. In response to the challenges of longer bridge spans and more application of highstrength concrete in future girder design, highcapacity strands hcss have recently. A beginners guide to simple plate girder design to ec3 part 15. Shear resistance of the stiffened web panel closest to the internal support p1. This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the aashto lrfd bridge design specifications second edition, 1998, including interims for 1999 through 2002. Use is made of a computer program to compare the behaviour of alternative girder support systems and the advantages and disadvantages of each is summarized. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. Characteristics design of gantry girder is a classic example of laterally unsupported beam.