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. The results of the parametric study, along with critical design issues that were identified and related recommendations, are summarized in volume 1 of this report. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Steel girder design example using 3rd edition aashto lrfd. 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. This includes the criteria and the allowable stresses used in the design, as well as alternative types of girder with advantages and disadvantages given for each. Zahn what differentiates a beam from a plate girder. Design considerations for steel plate girder bridges. Pdf the design of structures whether reinforced concrete or steel are governed by code provisions.
Plate girder plate girders are normally designed to support heavy loads over long spans in situations where it is necessary to produce an efficient design by providing girders. It is subjected to in addition to vertical loads horizontal loads along and perpendicular to its axis. Welds are also subjected to the general stress analysis with regard to parallel and vertical shear stresses and their superposition. Craneway performs the general stress analysis of a crane girder by calculating the existing stresses and comparing them with the limit normal, shear and equivalent stresses. For this steel girder design example, a plate girder will be designed for an hl93 live load. Comprehensive design example for prestressed concrete. The purpose of this document is to illustrate how the pgsuper computer program performs its computations. For e, this difficulty is overcome by tabulating allowable stresses for different materials astm a7 a36, etc. Entire families of prestressed concrete bridges, such as launched bridges, span. Performing organization name and address center for transportation research. Design of steel girders with diagram your article library.
Elremaily construction technology laboratories, inc. This study concerns with finding the geometric dimensions of a plate girder which minimize the total weight and satisfy the design requirements using genetic algorithm ga, sequential quadratic. Pdf introduction to plate girder design free download pdf. A single girder or double girder design will be one of the largest contributors to the complexity and overall cost of a new overhead crane system.
Extend bearing stiffeners the full height of the girder. After reading this article you will learn about the design of steel girders with the help of diagrams. The fhwa posttensioned box girder design manual was developed for engineers who have limited exposure to the design and construction of prestressed concrete bridges. Design alternative asset id, destination fixed luminaries for general lighting will have an asset tag attached to the physical item but shall not impair performance of the equipment. Detailed design examples for an aashto type iv girder and a texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and. In this project work the prestressed concrete girder bridge, already. In 2004, design charts were developed for it girders. Design to ec3 part 15 nanyang technological university. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5. During project work considerable efforts have been endured upon analysis and design of prestressed concrete girder bridge. 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. Structural steel 1 of 18 rev plate girder design project. Laju kottalil abstract the concept of ushaped bridge girder is now being increasingly adopted in urban metro rail projects and for replacing old bridges where there is a constraint on vertical clearance.
For segmental construction and posttensioned spliced precast girders, other than during preliminary. Previously in korea, multiple girder plate bridges were constructed more frequently, because. Dec, 2012 plate girder plate girders are normally designed to support heavy loads over long spans in situations where it is necessary to produce an efficient design by providing girders of high strength to weight ratio. In response to the challenges of longer bridge spans and more application of highstrength concrete in future girder design, highcapacity strands. Design, analysis, and rating of spliced girder bridges. The detailed design process to maximise girder efficiency satisfying strength, stability, stiffness, fatigue or dynamic criteria, as relevant, can be then carried out.
This version was incorporated into bradd2 and was not released to the user community. Lrfd steel girder superstructure design example lrfd. Wisdot bridge manual chapter 24 steel girder structures july 2019 245 24. Chapter 14 prestressed concrete girders transport and main. Design of continuous highway bridges with precast, prestressed concrete girders clifford l. Wassef christopher smith kevin johns modjeski and masters, inc. Design of plate girders for deck type railway bridges parvathy krishna kumar1 1assistant professor, department of civil engineering, scms school of engineering and technology, cochin, kerala, india abstractplate girder bridges are the most common type of steel bridges generally used for railway crossing of streams and rivers. Key words steel tub girder bridge, steel box girder bridge, lrfd, bolted field splice, top flange lateral bracing, box girder distortional stresses 18. It provides advice, for those already acquainted with the design of composite ibeam bridges, on the particular aspects of box girders bridge design and the. Plate girder design using lrfd university of maryland. Report introduction to plate girder design please fill this form, we will try to. Have a well founded knowledge of design specifications.
Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges. Impact of overhang construction on girder design 5. One way of improving the load carrying resistance of a slender plate is to employ stiffeners lecture 8. However, it is a necessary and important part of plate girder design when applying the load. Calculate the bending moment to be opposed by the beam with respect to loads and span of the beam. Mar 22, 2018 design of gantry girder part1 duration. Design guidelines for steel trapezoidal box girder systems. 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. 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. Plate girder bridges details and design requirements. Computeraided design, analysis and load rating of precast. Such buckling problems have to be given careful consideration in plate girder design.
Optimum design of welded steel plate girder using genetic algorithms. Design of prestressed concrete girder bridge request pdf. Effect of skew angle in u girder metro karthika k a, dr. Selflaunching erection machines for precast concrete bridges marco rosignoli the technological aspects of construction influence the modern bridge industry from the very first steps of design. Roof framing with cantilever gerber girders and open web steel joists introduction the structural steel roof framing described in this publication and commonly called the cantilever girder or gerber system has been used successfully for many years throughout north america. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Freyermuth design research section portland cement association skokie, illinois continuous highway bridges with precast, prestressed girders have been built by a number of states. This requirement, along with other requirements for fixing alignment of the. Design steps for plate girder design of steel structure ll duration. Detailed design of splices and other connections are discussed in lecture 15b.
The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. Design of plate girders for deck type railway bridges. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. Design step 5 design of superstructure prestressed concrete. The design shear forces and bending moments are shown in fig. 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. Guidelines for design and construction of decked precast, prestressed concrete girder bridges final report prepared for national cooperative highway research program transportation research board national research council r. The bridge design detailing manual guidelines listed below are developed and maintained by the structure design detailing technical committee within the division of engineering services des. Formula 5 may seem too complicated for design purposes. I270 carries a significant number of daily commuters between illinois and missouri with an average. Analysis and design of prestressed box girder bridge by irc. Design of gantry girder 2 features design of gantry girder is a classic example of laterally unsupported beam.
Design optimization and structural performance evaluation. Analysis and design of prestressed box girder bridge by. Cheryl prewett professor of civil engineering and director center for infrastructure research university of nebraskalincoln omaha, nebraska 114. Bridge design guide the texas department of transportation ftp.
Wider flanges for this girder type may also be used. Four distributed systems architectural patterns by tim berglund duration. Selflaunching erection machines for precast concrete bridges. Design guidelines for steel trapezoidal box girder systems 6. The following revisions were made to the departments prestressed concrete girder program. Design of posttensioned girder anchorage zones by w. Authors seongyeong yang, todd helwig, rich klingner, michael engelhardt, and jeremiah fasl 8. Prestressed concrete girders drafting and design presentation standards manual, transport and main roads, march 2018 2. Here, l is the length between points of zero moment. Analysis and design of plate girder and box girder test. Difference between beam and girder with 3d animation duration.
Design and construction of spliced 1 girder bridges ahmad m. A stiffened plate girder with tensionfield action acts like a pratt truss, with the web plate resisting diagonal tension. Pdf design of plate girders miftakhu zaim academia. I270 bridge over chain of rocks canal introduction i270 is a fourlane interstate expressway that serves as a north bypass to the city of st. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation. Impact of lrfd specifications on design of texas bridges. 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. Lrfd design example for steel girder superstructure bridge. Threespan continuous straight composit e i gi rder load and resistance factor design third edition customary u. Design of steel and composite bridges highway bridges.
The following note discusses the standard formula for the shear flow between web and flanges of a doubly symmetric beam which is used for weld design and gives the background to the formula in eurocode 3 part 51. A bridge crane is a type of overhead crane that includes two or more overhead runways built into the buildings support structure. 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. Preferred practices for steel bridge design, fabrication, and. With these tables, it 1s a simple matter to find the allowable shear stress for a given girder geometry, or. Single girder overhead crane overhead bridge crane. This page introduces the bridge design manual lrfd, which provides design methodology for bridges that considers load and resistance factors based on the known variability of applied loads and material properties. Ikuerdesign suchasminimumthicknessofmaterialinwebplates, andminimumedgedistancesforpunching,theyfixalimit 10sizeofcertainpa. Aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Detailed design of the plate girder is discussed in lectures 8. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. Curved steel 3d example aashtoware bridge design and rating. 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.
A beginners guide to simple plate girder design to ec3 part 15. 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. Chapter 1 presents a brief history of the use of the bridge type and describes the basic components of a box girder superstructure. However, the nui girder charts have since become obsolete because they were developed for low strength concrete 6 ksi and 0. For all possible values of alh and hit these stiffeners will have sufficient strength if their gross area,as is aasho. Alternative wide flange igirders now have type approval for designs where spans may be up to 46 m. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Recent developments in optimum design methods allow direct design of girder bridges, considering minimisation of weightcost. Pdf optimum design of welded steel plate girder using. This project outlines the design of both a steel and concrete girder system and their respective components piers, abutments, bearings, expansion joints, etc. Aashtolrfd design example horizontally curved steel box girder bridge final report prepared for national cooperative highway research program transportation research board national research council john m. 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.
Seminar bridge design with eurocodes jrc ispra, 12 october 2012 2 main selected features general presentation and scope of ec3 and ec4 related to steel and composite bridges materials structural analysis crosssection analysis at uls and sls treatment of instabilities fatigue. Chapter 3 superstructure design guidelines section 1 general recommendations bridge design guide 32 txdot january 2020 section 1 general recommendations prestressed concrete beam and girder design txdots policy is held firmly to a 6. 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. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4.
Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder. This is because this asset is not expected to be a regularly serviced asset and it is not expected to be regularly removed or moved. It gives two worked examples, one for a multi girder bridge and one for a. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. Precast prestressed concrete igirder bridges have become the most dominate bridge system in the united states. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140.
This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. The first task, analysis and design of horizontally curved plate girder and box girder. The formulation is very general and includes a variety of design options such as. These standard guidelines, examples and checklists assist engineers and detailers to produce preliminary design studies, contract plans and other. Wisdot bridge manual chapter 24 steel girder structures. Precast, prestressed girder design example pgsuper training 242020 1. Design recommendations for plate girders lehigh university fritz engineering laboratory rep. Description download introduction to plate girder design comments. Stiffened plate girders may or may not be designed for tensionfield action to resist the shear. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. Plate girder design using lrfd american institute of steel.