Introduction in 1993, the american association of state highway and transportation officials aashto adopted the load and resistance factor design lrfd specifications for bridge design. The publication of a second edition followed in 1998, along with the publication of the first edition of a companion document the aashto lrfd bridge construction specifications. Design of steel girders with diagram your article library. Precast, prestressed girder design example pgsuper training 242020 4. This manual documents policy on lrfd bridge design in louisiana. This article provides a description of the features of this type of bridge and introduces. Longitudinal superstructure analysis and design are addressed in chapter 7. The first edition of the design specifications was published by aashto in 1994. The two most common types of modern steel girder bridge are plate and box. The design shear forces and bending moments are shown in fig. These include standard concrete cover and bar spacing dimensions, plus a variety of specific design and detailing instructions. Let the crosssection of the deck be assumed as shown in fig. Pdf comparative study of rcc t girder bridge design using. Request pdf design of prestressed concrete girder bridge during project work considerable efforts have been endured upon analysis and design of prestressed concrete girder bridge.
The first task, analysis and design of horizontally curved plate girder and box girder test assemblies, is complete. The steel plate girders are haunched to maximize structural efficiency in the negative moment regions. Concrete structures chapter 5 wsdot bridge design manual m 2350. Current design practice, as outlined by caltrans seismic design criteria, assumes that. 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 designanalysis program no two programs will match exactly of course. Plate girder bridges details and design requirements. In some cases, the plate girders may be formed in a zshape rather than ishape. Preliminary design considerations the success of a steel bridge design depends on the preparation of the designer. Base dead load deflection and camber on an analysis for continuous placement, even if staged placement is specified in the plans. Design step 5 design of superstructure prestressed concrete. Appendix b example problems transportation research board.
Saves the bridge description in this window and its tabs to memory and closes the window. Sr210 over pond creek is an example of the upper limits of span. Development of lrfd specifications for horizontally curved. Design of plate girder design of plate girder design principles design inputs span l, loadings, depth and width internal forces bmd and sfd bending resistance effective width method effective section area, a eff effect second moment of area, i eff elastic modulus w eff m y,rd modifiedflangesonly method. Authors todd helwig, joseph yura, reagan herman, eric williamson, dawei li 8. The deck may consist of 3 girders spaced at 2, 45 m. Design guidelines for bridge widenings, steelreinforced elastomeric bearings fo r pretensioned concrete beams, stru tandtie method, and culverts. Aashto lrfd bridge design specifications have provided a. The following illustrates the process for a multi girder bridge. The example problem is a three span continuous box girder bridge that is 700 ft. Types and design methods of reinforced concrete bridges are presented. Bilal elariss first semester 20042005 objectives the objective of the project is. Download a pdf of development of lrfd specifications for horizontally curved steel girder bridges by the national academies of sciences, engineering, and medicine for free.
Wassef christopher smith kevin johns modjeski and masters, inc. Lrfd design example for steel girder superstructure bridge. After reading this article you will learn about the design of steel girders with the help of diagrams. Plastic design of steelconcrete composite girder bridges.
This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. University college of engineering graduation project ii. The following illustrates the process for a multigirder bridge. Design and load rate the first interior girder girder b. Design to ec3 part 15 nanyang technological university. But, it can not be adopted for the halfthrough or through girder bridges because it interferes with functions of the bridge. Abstract 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 i girder bridge. Threespan december 2015 continuous horizontally curved composite steel i girder bridge 6. Locate field splices at or near points of dead load contraflexure. Design guidelines for steel trapezoidal box girder systems 6. Deck design follows the nmdot standard deck slab detail in chapter 4 of the nmdot bridge procedures and design guide, hereinafter referred to as design guide.
Four span simply supported steel plate girder input. Refer to the latest edition of ladotd bridge design manual 4th english edition for. If the girder is an edge girder, approximately 85% of the total shear will be carried by the girder under consideration. This report, in conjunction with the companion report on fmite element analysis of curved bridges, provides a complete set of analysis procedures for the design and checking of curved steel girder bridges. The simplest and versatile software for structural analysis and design of bridges with super structures, sub structures, foundations, hydrological analysis, culverts, underpasses. Design of prestressed concrete igirder bridge superstructure. Steel plate girder bridge design using indian standard. Design considerations for steel plate girder bridges.
Standard aashto hl93 traffic loading is followed for the analysis of bridge prestressed concrete girder as it is widely used for the design of prestressed concrete girder bridges. 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. This document primarily discusses common steel girder bridge types. Use one design truck per bridge and scale results by number of factored design lanes nl as determined on page b37 live load lane. 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. Multi girder bridges are one of the most common types of medium span composite bridge in the uk. Abstract 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. Comparative study of rcc t girder bridge design using different codes.
This includes the distance between the end plate with the exterior access door and interior plate. For example, a firstorder analysis on a straight bridge. Pdf comparative study of rcc t girder bridge design. Bridge design free download as powerpoint presentation. The paper will discuss the challenges faced during the design and construction of the long span i270 chain of rocks bridge. Curved, precast, pretensioned concrete igirder bridges pci. Policy on lrfd design of specific bridge superstructure components. Department, sri vasavi institute of engineering and technology, andhra pradesh. Loading single lane of class 70r or two lanes of class a. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 547 design step 5. In this paper, cost optimization approach of a posttensioned pc i girder bridge system is presented. In this paper, cost optimization approach of a posttensioned pc igirder bridge system is presented.
Preferred practices for steel bridge design, fabrication, and. Interstate and trunklines use hs25 loading for all structures carrying interstate or trunkline routes, and on and off. If staged placement is specified, base girder design on the worst case effect of staged and continuous placement. For large structures, perform a web depth study to arrive at the optimal girder height. Posttensioned box girder bridge an analysis approach using. Multi girder construction is used for single spans and for continuous multiple spans, and it is particularly effective where construction depth is limited. As a result, there are many steel girder bridges, where the end shear controls the overall bridge. The most efficient depth of girder will vary with span and girder spacing. Pdf the primary purpose of this thesis is to investigate the plastic reserve of composite. A beginners guide to simple plate girder design to ec3 part 15. Design step 5 design of superstructure prestressed.
Some geographic areas, however, have steel beam girder bridges that are at a competitive. This design example was edited in 2012 by hdr engineering, inc. Manual for bridge evaluation, 1st edition, american association of state. Saves the bridge description in this window and its tabs to memory and keeps the. For more information on analyzing torsional loading refer to article 6. Typically a member taller than the minimum will be the most efficient. Specify continuous placement of bridge deck where possible, and staged placement only if required. Steel bridges ii structural steel rev design project. Design step 5 design of superstructure prestressed concrete bridge design example task order dtfh6102t63032 549 sample calculations at 54 ft. 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 design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation.
Multigirder construction is used for single spans and for continuous multiple spans, and it is particularly effective where construction depth is limited. The question of how to size the end plate for distribution of the beam flange forces. The superstructure design includes the following elements. The various analysis nuances that can affect the results of a steel bridge analysis, and the implications of variations in the results of a steel bridge analysis. From girder end midspan of noncomposite beam girder top stress. Pgsuper models the various construction stages with construction events. Threespan continuous straight composite i girder load and resistance factor design third edition customary u. The design and construction of a long span i girder bridges can be complex, however when all of the issues.
This latter design was copied by many countries, including germany, who called their version the kastentragergerat kgerat for short. It is a supplement to the latest edition of aashto lrfd bridge design specifications, which designers should be adhere to unless directed otherwise by this document. The recommended spandepth ratio for simply supported girder varies between 12 for short span and 20 for long span girder. The second connection, known as the extended strand with splice and end plate essp. Simplified continuity details for short and mediumspan. Elremaily construction technology laboratories, inc. Shear resistance of end panels of steel girders caltrans. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrica. What we do, were going to choose a steel plate girder bridge. 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. Analysis and design of prestressed box girder bridge by irc. Aashtolrfd design example horizontally curved steel igirder bridge final report prepared for national cooperative highway research program transportation research board national research council john m.
Policy on lrfd design of specific bridge substructure components. A primary reason for using continuity with precast, prestressed girders is the elimination of the maintenance costs associated with bridge deck joints and deck drainage onto the substructure. Final design chapters 7, 8, and 9 of the posttensioned box girder design manual focus on final design. Pdf plastic design of steelconcrete composite girder bridges. Design of prestressed concrete girder bridge request pdf. Have a well founded knowledge of design specifications. Thesis pdf available april 20 with 10,563 reads how we measure reads. Lrfd 3rd edition threespan continuous straight igirder 1. A scaled down version of this design, the small box girder bridge, was also formally adopted by the army in 1932. Analysis and design of plate girder and box girder test.
Hence, design of lateral bracing should take account of this effect also. A girder bridge is a bridge that uses girders as the means of supporting its deck. Siteblauvelt engineers cranberry township, pa pittsburgh, pa b s d i design. Design guidelines for steel trapezoidal box girder systems. In a plate girder bridge, the plate girders are typically ibeams made up from separate structural steel plates rather than rolled as a single crosssection, which are welded or, in older bridges, bolted or riveted together to form the vertical web and horizontal flanges of the beam. Stuchndarnubmoxamdqajntmt theoryofetnadjatfibution. Threespan december 2015 continuous horizontally curved composite steel igirder bridge 6. Guidelines for computer modeling of posttensioned box girders are presented in this chapter. The martel bridge was adopted by the british army in 1925 as the large box girder bridge. Typical design bending moments from different bridge loads 3 optimization formulation the design of welded plate girders requires determination of six geometrical dimensions. Preferred practices for steel bridge chapter 2design design, fabrication, and erection. Girder analysis and design is performed using the computer. Comparing bs5950 with ec3 part 15 in plate girder design design of plate girder bs5950 most design rules found in sections 4.
Class 5000 or higher used in cip posttensioned concrete box girder construction, deep bridge foundations, or in other special structural applications if significant economy can be gained or structural requirements. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. The initial conceived and implemented approach was to design bridges in. For curved girders, use above and increase by 10 to 20 percent, or use lrfd equation 2. Download structural design software astra pro 23 developed by techsoft engineering services. Steel plate girder bridge design using indian standard method and british standard method by nur afifah binti azemi dissertation submitted in partial fulfilment of the requirements for the bachelor of engineering hons civil engineering january 2014 universiti teknologi petronas bandar sri iskandar 31750 tronoh perak darul ridzuan. Governing shear occurs when the design heavy vehicle is placed directly over a girder adjacent to a support.
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