The following note discusses the standard formula for the shear flow between. Pdf design of plate girders miftakhu zaim academia. Design and optimization of plate girders and weldfabricated. Plate girder bridges details and design requirements plate girders became popular in the late 1800s, when they were used in construction of railroad bridges. Plate girder design using lrfd, engineering journal, american institute of steel construction, vol. 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. Ikuerdesign suchasminimumthicknessofmaterialinwebplates, andminimumedgedistancesforpunching,theyfixalimit 10sizeofcertainpa. The formulation is very general and includes a variety of design options such as.
Design considerations for steel plate girder bridges. Currently, design of plate girders and weldfabricated beams necessitates an iteration of trial designs to establish the webbuckling range used in analysis. In this situation, girders are to be fabricated using flange and web plates as per requirement. Beams subjected to biaxial bending design of plate girders riveted and welded intermediate and bearing stiffeners web splices design of beam columns 5. Wisdot bridge manual chapter 24 steel girder structures. Welded plate girders, which are the most common form of plate girders, are built. Welded plate girders should be specified instead of rolled beams for the conditions as follows. In india, industries usually have quality range of gantry girders for industrial sheds. Welded plate girders design recommendations prooftests. Stiffened plate girders may or may not be designed for tensionfield action to. The design shear forces and bending moments are shown in fig. By 1950s welded plate girders replaced riveted and bolted plate girders. Design of web to flange welds in plate girders, october 2017.
The flanges of plate girders resist the bending moment. Plate girder bridges details and design requirements. Zahn what differentiates a beam from a plate girder. Learn how to design a plate girder step by step with simple method. Plate girder article about plate girder by the free dictionary. Extend bearing stiffeners the full height of the girder. Pdf optimum design of welded steel plate girder using genetic. As such, it is capable of supporting greater loads on longer spans.
They are used to support loads over long spans 60 ft. The plates were joined together using angles and rivets to obtain plate girders of desired size. Design of plate girder part 2 design of plate girder part. Department of transportation federal high way administration splice design. Design to ec3 part 15 nanyang technological university. The bridge loading is applied through influence line. Design of plate girders for deck type railway bridges. Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges. The recommended spandepth ratio for simply supported girder varies. Optimum design of plate girders subjected to highway bridge loading is presented in this paper. Wisdot bridge manual chapter 24 steel girder structures july 2019 245 24. 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. Assume case 1 follow procedure of design of plate girder. Welded plate girders design recommendations prooftests of two slenderweb welded plate girders p.
In such cases, the designer must choose between a plate girder and a truss. Design and optimization of plate girders and weldfabricated beams for building construction, engineering journal, american institute of steel construction, vol. 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. 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. Plate girder design using lrfd american institute of steel. 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.
The design may be based on any one of the following assumptions. Mar 22, 2018 design of plate girder part2 duration. Design of welded connections american welding society. 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. 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. For these beams, readymade i sections are not suitable since selection from design of steel structures book. 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. 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. Welded plate girders design recommendations prooftests of. 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. 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. Assisted by skilled workers in india, companies have been able to successfully grow towards the zenith, but.
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. For these beams, readymade i sections are not suitable since their depth is limited due to buckling of the web. Pdf this study concerns with finding the geometric dimensions of a plate girder. 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. Damodar maity, department of civil engineering, iit guwahati. Design of plate girders 2 of welded plate girders in this book. Pdf optimum design of welded steel plate girder using. The flange section is varied along the length of the bridge. It carries an uniformly distributed load of 100 knm. Mar 29, 2018 learn how to design a plate girder step by step with simple method. If rolled beams are specified, the selected sections shall be ensured to be available. This module addresses the design of welded plate girders.
Design a welded plate girder 24 m in effective span and simply supported at ends. Assumptions for the design of plate girder bridges following assumptions are made in the design of plate girder bridges. 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. Structural steel 1 of 18 rev plate girder design project. Lecture series on design of steel structures by dr. Plate girders are used in both buildings and bridges. Top flanges of composite plate girders are typically smaller than their bottom flanges. Optimum design of welded plate girderssubjected to highway.
Key words steel bridge, steel i girder, aashto lrfd, moment redistribution, cross frame design 18. 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. 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. 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. Pdf the design of structures whether reinforced concrete or steel are governed by code provisions. 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.
The work oonsisted of analytioal studies and a series of tests on full size, welded steel girders. 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. But, in a plate girder the web being deep and thin is liable to buckle. 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. The typical welded plate girder consists of flange plates welded to a deep web plate. However, it is a necessary and important part of plate girder design when applying the load and resistance factor design lrfd specification. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. 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. 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. Steel bridge design handbook splice design volume 14. Roof trusses and industrial structures roof trusses roof and side coverings design loads, design of purlin and elements of truss.
846 832 1098 859 1030 365 57 1095 639 13 305 1026 1269 131 787 74 717 664 1502 1461 726 1115 422 1178 845 1194 730 1279 1521 1510 1269 1298 1361 1158 1249 31 649 396 652 233 411 535 568 21 1422 1321