Steel truss member strengthening design example fhwa. To download an electronic version pdf click on one of the links below. Cambering for design loads that exceed actual dead loads results in arched ceiling line that may be undesirable. Analysis and design of composite steelgirder bridge. The files attached include a csibridge model and a detailed pdf which documents the modeling and verification procedures for a composite steelgirder bridge design based on the example published in the lrfd design example for steel girder superstructure bridge fhwa nhi04041 by fhwa in november 2003. Uses a substantial number of lightweight elements, easing the task of construction truss elements are usually of wood, iron, or steel some other types of truss bridges bollman truss. Design of industrial truss university of asia pacific. For example, if you compare deflections of a truss. Worked examples presented at the workshop bridge design to eurocodes, vienna, 46. Design considerations for pedestrian truss bridge structures. Feb 24, 2017 etabs 2015 tutorial 10 steel truss modelling and design using is codes part2. Steel is a most versatile and effective material for bridge construction, able to carry loads in tension, compression and shear.
Truss girder rail bridge worked example 1 made by sssr date 8 structural steel design project calculation sheet checked by vk date for maximum force in members l 0 u 1 and l 1 u 1. The primary goal of the collaboration is to achieve steel bridge design and construction of the highest quality and value through standardization of the design, fabrication, and erection processes. The project discussed analysis and design of steel truss bridge, the bridge is 40m long and 12 m width and 8 m high, the spaces between the trusses in the roof are various, from the beginning we. Policy support documents resulting from the work of the jrc and cooperation with partners. Lrfd design example for steel girder superstructure bridge.
Work funded by cooperative agreement advancing steel and concrete bridge technology to improve infrastructure performance between fhwa and lehigh university. A truss bridge is a bridge that uses trusses, or a series of triangles, for support. They are being used for both buildings and bridges. Etabs 2015 tutorial 10 steel truss modelling and design using is codes part2. Threespan continuous straight composite steel igirder bridge. Steel bridge, shop drawings, fabrication, detailer. 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. Design employs wrought iron tension members and cast iron compression members particularly suited for timber structures that use iron rods as tension members. The design example includes detailed design computations for the following bridge features. Pdf files in the structure component plans for each bridge number following the. Fictitious end floorbeams were modeled in the virtis analysis file. Engineered solutions structural plate design guide 7 edition. Trail bridge design aids instructions and guidelines.
Dissemination of information for training vienna, 46. In this chapter, initially, the details of structural steel trusses are discussed. This design example, steel truss member strengthening, involves the addition ofsteel cover plates to steel truss. The third chapter presents and contains the design calculations of slab, stringer and. Title and subtitle steel bridge design handbook design example 2a. Steel truss bridge design example civil engineering. Rating factor and tonnage calculations for truss members. Special requirements for steel bridge rehabilitation or modification. For the purpose of this design example a trapezoidal truss is adopted with a roof slope of 1 to 5 and end depth of 1 m. Steel bridges ii structural steel rev design project. Steel truss bridge design example civil engineering community. Mar 31, 2015 steel truss bridge design example the analysis of the structure has been done by a complete mathematical modelling using staadpro analysis. Twospan continuous straight composite steel igirder bridge 5. The design process for these bridge structures is not covered in this document.
More than one new hampshire truss has been condemned simply by the cost of removing the red lead paint that was the universal primer for steel until within the past few years. This paper describes the design and construction of the steel truss footbridges connecting the elevated stations to their entrances. The bridge is to be strengthened to meet hl93 design loading existing bridge designed for hs15 live load. No bracing as the composite deck will serve the purpose. A camelback is a subset of the parker type, where the upper chord consists of exactly five segments. Looking at the iron and steel on a truss bridge is a good. Contact your local contech representative for more information. Steel trusses can also be efficiently used along with concrete slabs in buildings and bridges by mobilising composite action between structural steel and concrete. Pdf which documents the modeling and verification procedures for a. This document is a standard developed by the aashtonsba steel bridge collaboration. 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. However, it is common practice, particularly for smaller bridges, for the detailed design of a footbridge to be included as part of a design and construct package. Note that in this illustration of this member, the portal effect and fatigue are not considered. This article provides an overall approach to siting and design considerations for prefabricated steel truss pedestrian bridges, but is not intended to be an allinclusive, stepbystep tutorial on bridge design.
The basic application of the aashto lrfd bridge design specifications to the design. Moreover not only natural frequencies but also damping properties, bridge mass and pedestrian loading altogether determine the dynamic response. Steel truss bridge design example free download as excel spreadsheet. As a result, you can design in familiar roof lines pitched or flat, with hips, gables, gambrels, monos, mansards, cantilevers, overhangs, scissors and floor trusses. Synopsis since inception of indian railways in 1853 the railway engineers has history of more than 250 years of construction and maintenance of railway bridges. Design of roof truss should follow the general layout that is prepared first. Structural shapes standard steel configurations produced by steel mills such as wide flanges, channels, angles, pipe, tubes, etc. Vehicular truss continental pedestrian truss larger steel sizes are available up through 80foot spans with the bridgecor product line. Ce 331, fall 2000 truss design example 1 8 design a typical steel truss girder to support the roof of the office building shown below. A basic understanding of bridge components and layout, including design codes, bridge styles, and loading, is explained in general detail.
A fully detailed design can be prepared with other contract documents for pricing by tenderers. It describes the steps in the design procedure for a composite plate girder highway bridge superstructure, explaining how to choose an initial outline arrangement and then how to apply design rules to analyse it and detail the individual. These bridge brands include contech structural plate, conspan, bebo, continental, steadfast bridges, and big r bridge. Steel truss bridge design example the analysis of the structure has been done by a complete mathematical modelling using staadpro analysis. Timber was found tobea valuable aid, especially for use in the. Few boards of selectmen dare to commit their towns to an expensive rehabilitation, even of a recognizably historic span, when. The basic wind speed is 50 ms and terrain is open industrial area and building is class a building. No other building component combines strength, stiffness, fire resistance, insect resistance and design flexibility so well. A parker truss bridge is a pratt truss design with a polygonal upper chord. Steel roof truss design example is evident in the major structures built across the globe. A sample analytical method for bearing resistance calculation. There is a wide variety of structural forms available to the designer but each essentially falls into one of four. This gives a flat, level ceiling line after dead loads are applied. The howe truss, one of the more popular designs, was.
Design steel roof truss in etabs 2016 as per is codes duration. Trusses are designed using astm a36 double angles with equal legs according to recommended allowable strength design asd procedures that account for buckling of compressive builtup doubleangle members and the effective net area of tension members per aisc, design examples. The structural steel distribution for a main girder is presented in fig. An example of a parker truss is the traffic bridge in saskatoon, canada. Here are a few interesting facts about the optimal design of through truss steel bridges. The plans require the contractor to provide a design prepared by a professional engineer for the steel truss superstructure and abutment foundation. Trussteel is the most accepted, most specified coldformed steel cfs truss system on the market today. This design example, steel truss member strengthening, involves the addition ofsteel cover plates to steel truss members, onetension member and onecompression member. Thus, the design drawings describe to the contractor the steel bridge superstructure that the owner wants to see in place when the project is completed. Contact your local contech representative for more. Structural steel the structural elements that make up the frame that are essential to supporting the design loads, e.
Consider structural slab thickness for ratingdesign. Truss bridge construction developed rapidly during the industrial revolution. This design example, steel truss member strengthening, involves the addition of steel cover. Analysis and design of composite steelgirder bridge tutorials. 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 bridge.
Steel truss bridge design example truss stress mechanics. Subsequently, the behaviour and design of structural steel concrete composite trusses are discussed. Dec 01, 2017 a through truss bridge is one in which the roadway dissects the truss, meaning the truss is seen both above and below the deck. During the long journey they had achieved several heights and continuing to excellence. Truss girder rail bridge worked example 1 made by sssr date 8 structural steel design project calculation sheet checked by vk date 4 design for truss members. Bridge design manual, little additional documentation is required. Design of reinforced concrete bridges department of civil. Contech bridges vehicular and pedestrian fit a wide variety of applications, spanning distances from five to 300 feet and more. Many fabricators are able to provide such a package, using methods and details of. This design flexibility makes trussteel trusses ideal for almost any building type. Steel trusses are mainly used to build the strong base.
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