Steel box girder redesign of estero parkway flyover. Proceedings of an international conference held on 14 february 1973. Finley used lusas bridge for its engineering redesign of the estero parkway flyover in fort myers, florida, for the contractor, zep construction. This means that the girders are manufactured in a factory and transported to the location of the bridge, where they are fixed together. The frequency of use of steel box girders has increased in the state of texas and throughout the united. Steel bridge tutorials computers and structures, inc. The application of genetic algorithms gas for a class of numerical examples is investigated. A design optimization problem for steel box girder sections is formulated and a numerical solution procedure is presented.
Structures design office structures detailing manual examples. This type of solution has the benefit of having great resistance relatively to its own weight, resulting from the optimization of steel and concrete properties. German highway administration authorities have even given external prestressing the status of the preferred solution for new concrete boxgirders 1. It is assumed the bridge will be cast on falsework. Then the 1,400ton, 103mlong box girder was lifted successfully from the yangtze river to its final place with strand jacks. Steel girder bridge design plans shall be submitted in phasestwo 2. Predictions of several fe models are assessed against the results acquired from a field test.
Steel box girder bridges american institute of steel. The behavior of box girder section for a general case of an. Concrete boxgirder bridge model tutorials computers and. Because of four unfortunate erection accidents of box girder bridges in austria, the united kingdom, australia, and germany, this type of structure has received much recent attention. Design guidelines for steel trapezoidal box girder systems 6. Design guide for composite box girder bridges steelconstruction. At present a number of innovations taking place in ontario and elsewhere. A girder may be of longer spans, take greater load. Design and rating for curved steel i and box girder.
Analysis and design of prestressed box girder bridge by irc. Threespan continuous horizontally curved composite steel tubgirder bridge 5. Temperatures of the steel tub increase rapidly due to the low weighttoheated perimeter ratio of the thin members. Bridges, and utca projects 03228, stability of curved bridges during construction. Proposed design specifications for steel box girder.
Bridge load rating for psc box and composite girder. For medium span highway bridges, composite box girders offer an attractive. The example problem is a three span continuous box girder bridge that is 700 ft. Appendix i design example integral steel boxbeam pier.
Comparison of the amount of reinforcement for a boxgirder. Price composite steel box girder bridges have become an effective alternative to more conventional plate girder bridges and concrete girder bridges in north america in the past 25 years. When tension flanges of longitudinal girders are connected together, the resulting structure is called a box girder bridge. Steel tub girder bridge, steel box girder bridge, lrfd, bolted field splice, top flange lateral bracing, box girder distortional stresses 18. They are usually manufactured from prefabricated steel girders. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Posttensioned box girder bridge can be eliminated in continuousspan, castinplace box girders by utilizing monolithic connections between the bridge superstructures and the piers, which in turn eliminate the bearing assemblies maintenance problems. New steel box girder bridge heemsteedse brug across. Design guidelines for steel trapezoidal box girder systems todd helwig joseph yura reagan herman.
Curved steel 3d example aashtoware bridge design and. Data gathered from the experimental testing program were used to validate nonlinear finite element models as well as simplified engineering models. Steel box girder bridges this title is part of the ice publishing complete digital collection helping ensure access to essential engineering content from past to present. Lrfd design example for steel girder superstructure bridge. Specifically, the example illustrates the design of selected critical sections from an exterior girder at the strength, service and fatigue. This horizontally curved steel box girder br idge design example was originally developed in the nchrp 1238 project using the 1993 aashto gu ide specifications for horizontally curved steel girder bridges. Lrfd steel girder superstructure design example lrfd. En 199315 used for bottom flange of a boxgirder bridge different effectives width for sls and uls combinations of actions 3 options at uls choice to be performed in the national annex b eff,flange b flange b eff,slab b slab. Each pdf opens showing the level of completion that is expected for the sheet. Steel box girders are usually adopted in very long span bridges where it is necessary to keep the selfweight of the structure as minimum as possible.
This book, which discusses the basic problems which appear in boxgirder analysis, introduces progressive methods and proposes ideas which challenge current concepts. Effective bracing of steel bridge girders outline stability bracing of i. Appendix b example problems transportation research board. The second phase if for final design of the structure and foundation system. Box girder sections are fabricated in a fashion similar to a plate girder except that there are two webs that form the sides of the box. Unfortunately, this book cant be printed from the openbook. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Advantages of steel box girder in bridges disadvantages. Whether steel or concrete were used on a bridge depended very much on the availability of the material locally.
Modeling the response of fracture critical steel box. Design guidelines for steel trapezoidal box girder systems. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. Since revisions or additions to the design file drawings may occur at any time, the. Foreword to first edition this guide is the fourth in a series of complementary design guides for composite highway bridges. Design and rating for curved steel i and boxgirder bridge structures c. Extending the spatial curved beam finite element theory considering effect of initial curvature developed earlier 7, the objective of this paper is to propose a 1d curved box girder dynamic finite element of three nodes and twentyone degrees of freedom taking account of tension, compression, bending, torsion, and warping and then apply it to analyze the natural vibration. Load distribution factors of straight and curved steel concrete composite box and i girder bridges by seyed jalaleddin fatemi thesis submitted for the degree of doctor of philosophy at the university of adelaide the school of civil, environmental and mining engineering australia. Bridges with composite steelconcrete box girder deck have been adopted in numerous cases. Attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steelgirder bridge, and a cablestayed bridge. Optimum cost design of steel boxgirder by varying plate thickness article pdf available in ksce journal of civil engineering 1. The steel box girder bridge, because of its structural efficiency and aesthetics, has become increasingly popular as a bridge type. Pdf files in the structure component plans for each bridge number. Plan, elevation and section views are shown on the following pages.
In addition, steel box girders are commonly constructed from. The example illustrates the design of a typical threespan continuous straight steel igirder bridge with spans of 140. 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 governing criterion for the use of single box girders on these sites was. The steel box girder may have longitudinal stiffeners on. Steel box girder is used for footbridges curved in plan and also for bridges with longer spans. Autogeneration of model files for additional verifications whilst considering. Contentlrfd design example for steel girder superstructure bridge aashtolrfd design example horizontally curved steel box girder bridge horizontally. Ex 2 curved steel box girder ex 2 curved steel box girder ncp. In doing so, finleys foursteel box girder design produced significant savings in construction costs over an initially proposed castinplace concrete box girder design.
Threespan continuous straight composite i girder load and resistance factor design third edition customary u. Analysis of curved weathering steel box girder bridges in fire. The centerline of the bridge lies on a 400 ft radius and the crosssection is a two cell box. Steel box girders and steel and concrete composite box girders are used for long spans, where the self weight of the bridge needs to be minimized, and for situations where their excellent high torsional stiffness is of particular benefit. Beam the term beam is a general term and means a horizontal member supported at its ends and subjected to loading perpendicular to its longitudinal axis. In recent years, steel, trapezoidal boxgirders for curved highway interchanges have been used. 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. 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. Evaluation of prefabricated composite steel box girder. Box girder types bridge building bridges of dublin. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Pdf optimum cost design of steel boxgirder by varying.
Fast modelling of steel i, box, tub and pc composite bridges using wizard. Pdf file click here for printable worksheet box girder bridges are quite common and a basic example is seen below. If you need to print pages from this book, we recommend downloading it as a pdf. The box is typically rectangular or trapezoidal in crosssection. Analysis and design of prestressed box girder bridge by. Behavior of curved steel trapezoidal boxgirders during construction. Ansys fe package is used to develop the models which offer different element types and physical contact conditions between concrete deck and steel girder. Stanford libraries official online search tool for books, media, journals, databases, government documents and more. A box girder bridge also known as a box section bridge is a bridge in which the main beams comprise girders in the shape of a hollow box.
It provides a basis for the design of both concrete and steel box bridges, and special attention is paid to stability problems, shear lag phenomenon, and to. 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. Key words bridges, curved bridge, igirder, box girder, bridge. The external prestressing of boxgirder bridges has received increasing attention in recent years, both for new bridges and for the retrofitting of existing bridges 1, 2. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Steel tub girder, steel box girder, lateral bracing, no restrictions. For this steel girder design example, a plate girder will be designed for an hl93 live load. The formulation is based on the load and resistance factor design lrfd procedure. Steel bridge design handbook steel structures bridges.
Results show large deflections in the steel box girder as the temperature of the steel increases over the duration of the fire. Load distribution factors of straight and curved steel. Plate girder and attachments steel girders have vertical plates welded to the webs called stiffeners. This bridge is the i girder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. The first phase is meant to establish type, size and location. Analysis of curved weatherin steel box girder bridges in fire.
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