Extend bearing stiffeners the full height of the girder. Beams of long span subjected to heavy loads are encountered in buildings and bridges. Optimum design of welded plate girderssubjected to highway. Zahn what differentiates a beam from a plate girder. Plate girder article about plate girder by the free dictionary. The web plates of plate girders resist the shear force and the shear stress is uniformly distributed over entire cross sectional area of the web. The typical welded plate girder consists of flange plates welded to a deep web plate.
Design of plate girders 2 of welded plate girders in this book. In this situation, girders are to be fabricated using flange and web plates as per requirement. In buildings, when large columnfree spaces are designed to be used as an assembly hall, for example, the plate girder is often the economical solution. Assume case 1 follow procedure of design of plate girder. 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. Wisdot bridge manual chapter 24 steel girder structures. Lecture series on design of steel structures by dr. Stiffened plate girders may or may not be designed for tensionfield action to. If rolled beams are specified, the selected sections shall be ensured to be available. Pdf optimum design of welded steel plate girder using. The formulation is capable of handling composite or noncomposite designs, shored or unshored construction, stiffened or unstiffened design, symmetric or unsymmetric crosssection, simple or continuous spans, and prismatic or nonprismatic girders. Member or component description member or component designation girders, beams, stringers, floorbeams, bent caps, bulkheads, and straddle beams primary truss chords, diagonals, verticals, and portal and sway bracing members primary arch ribs and builtup or welded tie. Pdf optimum design of welded steel plate girder using genetic. Mar 29, 2018 learn how to design a plate girder step by step with simple method.
Design a gantry girder to be used in an industrial b uilding carrying a manually operated overhead travelling crane, for the following data in table 1. Assumptions for the design of plate girder bridges following assumptions are made in the design of plate girder bridges. The flange section is varied along the length of the bridge. Design of plate girder part 2 design of plate girder part. Beams subjected to biaxial bending design of plate girders riveted and welded intermediate and bearing stiffeners web splices design of beam columns 5. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. Pdf the design of structures whether reinforced concrete or steel are governed by code provisions. Learn how to design a plate girder step by step with simple method. 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. Seshu adluri plate girders deep girders three plates welded or bolted rolled sections not enough usually 320 deep wwf sections in the handbook can be used web buckling. Design of plate girders for deck type railway bridges. Roof trusses and industrial structures roof trusses roof and side coverings design loads, design of purlin and elements of truss. For these beams, readymade i sections are not suitable since selection from design of steel structures book. The flanges of plate girders resist the bending moment.
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. Design and optimization of plate girders and weldfabricated beams for building construction, engineering journal, american institute of steel construction, vol. The work oonsisted of analytioal studies and a series of tests on full size, welded steel girders. Design of welded connections american welding society. Plate girder bridges details and design requirements plate girders became popular in the late 1800s, when they were used in construction of railroad bridges.
Welded plate girders, which are the most common form of plate girders, are built. For these beams, readymade i sections are not suitable since their depth is limited due to buckling of the web. Structural steel 1 of 18 rev plate girder design project. Design of web to flange welds in plate girders, october 2017. Ikuerdesign suchasminimumthicknessofmaterialinwebplates, andminimumedgedistancesforpunching,theyfixalimit 10sizeofcertainpa. Welded plate girders design recommendations prooftests of two slenderweb welded plate girders p.
However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. Design and optimization of plate girders and weldfabricated. 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. Pdf design of plate girders miftakhu zaim academia.
Optimum design of plate girders subjected to highway bridge loading is presented in this paper. The plates were joined together using angles and rivets to obtain plate girders of desired size. The purpose of the plate girder is to build a beam that is larger than anything that can be built by a steel mill or factory. But, in a plate girder the web being deep and thin is liable to buckle. 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. This module addresses the design of welded plate girders. Steel bridge design handbook splice design volume 14. Welded plate girders design recommendations prooftests of. Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges. The minimum effective length of a fillet weld shall be at least four times the nominal size, or the effective size of the weld shall be considered not to exceed 25% of its effective length. Welded plate girders design recommendations prooftests.
By 1950s welded plate girders replaced riveted and bolted plate girders. Plate girder bridges details and design requirements. The design shear forces and bending moments are shown in fig. Plate girders are used in both buildings and bridges.
They are used to support loads over long spans 60 ft. Damodar maity, department of civil engineering, iit guwahati. Rolled sections are so proportioned that normally there is no fear of web buckling under usually loaded conditions and hence local stability will not be a worthy consideration. 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. Civil semester vii institute of technology, nirma university plate girder introduction beams of long span subjected to heavy loads are encountered in buildings and bridges. 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. Design considerations for steel plate girder bridges. Design a welded plate girder 24 m in effective span and simply supported at ends. A beam built up of steel plates and shapes which may be welded or bolted together to form a deep beam larger than can be produced by a rolling mill see illustration. The design may be based on any one of the following assumptions. In such cases, the designer must choose between a plate girder and a truss.
The recommended spandepth ratio for simply supported girder varies. Mar 22, 2018 design of plate girder part2 duration. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. Currently, design of plate girders and weldfabricated beams necessitates an iteration of trial designs to establish the webbuckling range used in analysis. Design to ec3 part 15 nanyang technological university. Assisted by skilled workers in india, companies have been able to successfully grow towards the zenith, but. Plate girder design using lrfd american institute of steel. It carries an uniformly distributed load of 100 knm. As such, it is capable of supporting greater loads on longer spans. Wisdot bridge manual chapter 24 steel girder structures july 2019 245 24. For curved girders, flange width no less than 25% of the web depth for straight girders, flange width no less than 20% of the web depth. Plate girder design using lrfd university of maryland.
Top flanges of composite plate girders are typically smaller than their bottom flanges. Vinay agarval presented the capability of genetic algorithm as a directed search technique for optimum design of welded plate girder governed by the mixed nature of design variable. Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18. Pdf this study concerns with finding the geometric dimensions of a plate girder. Welded plate girders should be specified instead of rolled beams for the conditions as follows. Design of prestressed girder for bridge prestressed girder reinforcement details duration. The bridge loading is applied through influence line. 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. Mar 11, 2016 history and background of plate girders plate girders became popular in the late 1800s, when they were used in construction of railroad bridges.
Department of transportation federal high way administration splice design. The following note discusses the standard formula for the shear flow between. In india, industries usually have quality range of gantry girders for industrial sheds. The formulation is very general and includes a variety of design options such as.