Foreword the reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Only the design of slab bridge will be used for illustration. The reinforced concrete design manual sp1711 is intended to provide guidance and assistance to professionals engaged in the design of castinplace reinforced concrete structures. Appendix b example problems transportation research board. Concrete structures chapter 5 wsdot bridge design manual m 2350. Design step 2 example bridge prestressed concrete bridge design example 8 reinforced concrete deck 110 18 14 5 spa at 9 8 9 55 4 12 total width 52 roadway width figure 22 bridge crosssection 2.
Mar 27, 2019 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. Concrete boxgirder bridge model tutorials computers. The document also includes instructional commentary based on the aashtolrfd. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m t girder all simply supported. 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 losses, concrete. Fundamentals of posttensioned concrete design for buildings. It is a bridge in which the main beams comprise girders in the shape of a hollow box rectangular or trapezoidal shape. Concrete bridge lrfd specifications parsons brinckerhoff page 1 1.
For medium span highway bridges, composite box girders offer an attractive form of construction. Kansas department of transportation design manual volume iii us lfd bridge section version 109 5 1 5 5. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. Twospan continuous straight composite steel i girder bridge. The deck may consist of 3 girders spaced at 2, 45 m. In the preliminary design of this example a lumpsum procedure was used to account for the timedependent 118 effects. Beam properties for a plank beam now deduc t the area of the shear key. A design example followed by a load rating analysis illustrates the engineering computations performed by pgsuper. Design of deck reinforcement, including flexural resistance, limits of reinforcement, and control of cracking is based on aashto lrfd bridge design specifications 5. To provide an erection method being suitable for, in particular, erection of a prestressed concrete box girder bridge using a corrugated steel plate web. Concrete bridge design to bs 5400 download ebook pdf. The two most common types of modern steel girder bridge are plate and box.
Finally, an example of the analysis of a bridge composed of a continuousspan, posttensioned concrete box girder superstructure and a concrete pier is also demonstrated using the approximate equivalent load method. In this thesis analysis and design of prestressed concrete bridges deck slab, t girder and box girder are carried out using irc. Introduction this example illustrates new mexico department of transportation nmdot design procedures for a threespan prestressed concrete girder bridge. The examples cover the principal steps in the verification of the designs in accordance with the eurocodes, as implemented by the uk national annexes. Parametric comparison of rectangular and trapezoidal box. Plan, elevation and section views are shown on the following pages. A method for the design of intermediate external diaphragms is presented herein. Prestressed concrete continuous box girder bridge design. It is assumed the bridge will be cast on falsework. Analysis and design of prestressed box girder bridge by irc. Lrfd steel girder superstructure design example lrfd.
Impact of lrfd specifications on design of texas bridges. A girder bridge is a bridge that uses girders as the means of supporting its deck. Design of a single cell rcc box girder bridge youtube. Example bridge prestressed concrete bridge design example 2. May 12, 2015 this video contains transverse and longitudinal analysis of a single cell box girder bridge to determine design moment and shear for manual calculation of flexural and shear reinforcement of the. Construction of box girder bridges specifications, uses. Reinforced concrete deck supported on simple span prestressed girders made continuous for live load. Overview of reinforced concrete box girder bridge design capability.
Concrete bridge design to bs 5400 download ebook pdf, epub. Posttensioned box girder bridge an analysis approach. A box girder is formed when two web plates are joined by a common flange at both the top and. Abstract a number of prestressed concrete i girder bridges built in the past several decades have demonstrated the ability of precast, prestressed spliced girder bridges to compete with structural steel plate girder bridges in the 120 ft 300 ft span. In this thesis analysis and design of prestressed concrete bridges deck slab, tgirder and box girder are. While the design examples consider box girders of constant depth. Overview of reinforcedconcrete boxgirder bridgedesign capability.
Reinforcing members 21, 22 are attached to a bridge axis orthogonal plane of the corrugated steel plate web 11 and are mutually connected by length of erection in the direction of bridge axis to assemble an. The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340, design. The use of girder as a natural bridging element is abundantly evident in nature, such as a fallen tree trunk over. Fundamentals of posttensioned concrete design for buildings part one. Show full abstract concrete composite bridges when the nevers bridge was designed, because box girders where also supposed to require more fabrication time. Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010 support to the implementation, harmonization and further development of the eurocodes y. T or i girder bridges are the most common example under this category and are very popular because of their simple geometry, low fabrication. Pgsuper uses a stateoftheart iterative design algorithm and other iterative computational procedures. 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. Prestressed plank beams are considered a solid box beam for computing minimum losses and required number of strands. Chances are very high that today, a bridge engineer will learn how to design a bridge girder before any other bridge type. Only the superstructure design of the two concrete alternates will be covered in this article. Customary aashtopciasbi segmental box girder standards for spanbyspan and balanced cantilever construction december, 1997, metric units including the following. Falsework is the structural system that supports the formwork.
Concrete boxgirder bridge design per aashto lrfd 2007. Posttensioned box girder bridge an analysis approach using. Click download or read online button to get concrete bridge design to bs 5400 book now. Twospan continuous straight composite steel igirder bridge. Key words igirder, curved bridge, lifting, erection, construction 18.
Loading single lane of class 70r or two lanes of class a. However, some authors define beam bridges slightly differently from girder bridges. Key words prestressed concrete, lrfd, design, bridge girders, u54 girder, type iv girder, type c girder, parametric study 18. 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. 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. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. The substructure consists of integral end abutments and a multicolumn intermediate bent. The standard design tables are based on welded wire fabric reinforcement with a yield strength of 65 ksi and a concrete clear cover of 2 inches.
For span ranging from 20 m to 50 m box girder and t beam bridge girders are used. This type of superstructure is generally used for spans between 20 to 40 m. Analysis and design of boxgirder bridges are very complex because. The following design method can be used for normal weight concrete with specified compressive strengths up to 15. Posttensioned box girder design manual now available. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation.
Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal. This document consists of a comprehensive design example of a prestressed concrete girder bridge. This site is like a library, use search box in the widget to get ebook that you want. The first reinforced concrete design manual formerly titled aci design handbook was developed in. The box is typically rectangular or trapezoidal in crosssection. A twospan bridge example is used here to illustrate the design steps in detail. The use of girder as a natural bridging element is abundantly. Analysis and design of prestressed concrete box girder bridge. The design procedure was developed through an investigation of torsion in curved girders and the effect of torsion on twintrapezoidal box girder bridge systems.
Pdf analysis and design of prestressed concrete box. Design of prestressed concrete igirder bridge superstructure. This article presents highlights of the structures design and construction. The formula for computing exterior diaphragm weight has been revised.
The design and optimization of segmentally precast. The behavior of box girder section for a general case of an eccentric load has been s tudied and presented its studies in chapter 2. Texas u54 girder using both the aashto standard specifications and aashto lrfd specifications were also developed and compared. Example b1 comprehensive example problem description the example problem is a three span continuous box girder bridge that is 700 ft. One of the example problems is based on the box girder bridge erected over the intracoastal waterway at corpus christi, texas, and is essen tially a documentation of the preliminary design procedure used in devel opment of the structure. Concrete boxgirder bridge model tutorials computers and. Box culvert is a usually default buried structure type that serves a variety of purposes. Comprehensive design example for prestressed concrete girder. Elremaily construction technology laboratories, inc. This tutorial is based on the bridge specifications of the federal highway administrations steel bridge design handbook design example 2a. 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. The term girder is often used interchangeably with beam in reference to bridge design. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported.
For this steel girder design example, a plate girder will be designed for an hl93 live load. Analysis and design of prestressed box girder bridge by. North water diversion canal workers to total chengxing feng line continuous prestressed concrete box girder bridge. 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. Abstract a number of prestressed concrete igirder bridges built in the past several decades have demonstrated the ability of precast, prestressed spliced girder bridges to compete with structural steel plate girder bridges in the 120 ft 300 ft span. Bharil, in innovative bridge design handbook, 2016. Lrfd design example for steel girder superstructure bridge. One of the most commonly used forms of superstructure in concrete bridges is precast girders with castinsitu slab. Box girders, have gained wide acceptance in freeway and bridge systems due to their structural efficiency, better stability, serviceability, economy of construction and pleasing aesthetics. September 20 lrfd bridge design 123 height range to which it applies.
Design and construction techniques already popular and common for the ibeam form of composite bridges can be utilised to produce box girder structures of clean appearance whilst maintaining relative simplicity and speedy construction procedures. 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. Pdf advanced calculation methods for box girder bridges. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The superstructure consists of two simple spans made continuous for live loads. Shop drawing submittals for mndot approval will not be required when standard culvert sections are used. This video contains transverse and longitudinal analysis of a single cell box girder bridge to determine design moment and shear for manual calculation of flexural and shear reinforcement of the.
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