Design examples and box girder bridges are included. To avoid this circular dilemma, only the end spansat 157 feet long, the longest in the new bridge. In that example, girder design and detailing is evaluated extensively. This design manual is an outcome of the research project rfscr03018. The document is part of the federal highway administrations national technology deployment program and may serve as a training manual. The use of 8 ksi concrete for prestressed i girders and 6. 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. The manual is targeted at federal, state and local transportation departments and private company personnel that may be involved in the analysis and. Posttensioned box girder bridge an analysis approach using. A method for the design of intermediate external diaphragms is presented herein. A log across a creek is an example of a girder bridge in its simplest form.
Bridge detailing guide download bridge design guide. Rail post spacings and end of rail details for one or two bar metal rails. This space, referred to as the fillet or haunch by idot, typically consists of unreinforced concrete that increases the dead load of the section but is not normally considered to add strength. Until 1940 the structural possibilities for box girders were limited.
Composite box girder bridge with rectangular steel box sections. Pdf precast segmental box girder bridge manual serhat. Modeling of box girder bridge the tendon profile considered for the design of post tensioned box girder bridge is parabolic and mathematical model is shown in figure 6. Both singlecell and multicell box girders are discussed. In addition to general design guidance and information on detailing practices, this section contains three design examples. In the early design stages, preliminary design becomes. This example illustrates the design of a two span precast prestressed i girder bridge. Design step 7 design of substructure prestressed concrete bridge design example task order dtfh6102t63032 72 one group of states design the piles of an integral abutment to resist only gravity loads applied to the abutment. I authorize ryerson to lend this document to other institutions or individuals for the purpose of. Posttensioned box girder design manual federal highway. Concrete bridge lrfd specifications parsons brinckerhoff page 1 1. The design procedure was developed through an investigation of torsion in curved girders and the effect of torsion on twintrapezoidal box girder bridge systems. California has been dominated by concrete for nearly 100 years.
Both deck and girder concrete shall be of 28 days crushing cylinder strength f. This publication presents worked examples of the detailed design of two composite highway bridges. Design examples are presented in appendices to this manual. September 20 lrfd bridge design 121 buried structures serve a variety of purposes. Lrfd design of double composite box girder bridges lrfd design of double composite box girder rules to develop a model design example for use by bridge, prestressed tendons system in a box girder the design of small bridges and on the structural behaviour of reinforced concrete rc box girder bridges. The design methodology is based on both working stress and load factor principles. Impact of lrfd specifications on design of texas bridges.
Learn about the csibridge 3d bridge analysis, design and rating program and the comprehensive suite of tools it offers for the design of prestressed concrete. Abstract precast prestressed concrete i girder bridges have become the most dominant bridge system in the united states. To avoid this circular dilemma, only the end spansat 157 feet long, the longest in the new bridge were posttensioned. Substitution of cip conventional concrete in the contract document with shotcrete. Standard adot 42inch fshape barriers will be used resulting in a bridge configuration of 17 barrier, 120 outside shoulder. The examples cover the principal steps in the verification of the. Prestressed concrete ibeams distribution factor spreadsheet. Wisdot bridge manual chapter 19 prestressed concrete. The first portion of this report contains a general description of the design features peculiar to this type of bridge and the background material necessary to make design calculations. Large cracks, failure of epoxyfilled joint not hardened to take design shear force. Apr 26, 2012 after half a century of developments, concrete box girder bridges have a positive track record, are widely used, and have reached spans of up to 988 ft. Analysis and design of prestressed box girder bridge by irc. Prestressed concrete ubeams and xbeams distribution factor spreadsheet. Standard drawings standard specification drawing files in.
For spans in the range 45 to 100m, multiple girders are used, with the slab. Posttensioned box girder bridge an analysis approach. The superstructure consists of two simple spans made continuous for live loads. Estimate of maximum at the girder controls the longitudinal stiffeners consist of box girder exceeds the positive moment. Bridges built with adjacent precast, prestressed concrete box girders are a popular and. The deck slab acts compositely with the steel girders. The following design report will cover only precast segmental balanced cantilever construction. The example illustrates the design of a typical threespan continuous straight steel i girder bridge with spans of 140. Designers knew that as they increased the pier size, the box girder prestressing requirements would increase.
Reinforced and prestressed concrete are used extensively in bridge projects. For prestressed box girders, the use of concrete with strength greater than 5 ksi is only allowed with prior approval of the bos development section. Design bridge girder us comprehensive design example for. Behaviour of concrete box girder bridges of deformable crosssection. This document follows the steel bridge design handbook sbdh design example 3. Used for cip piles, shafts and deep foundations where vibration is not feasible or practical. Design guide for composite box girder bridges steelconstruction. The first example is of multi girder form, the second is of ladderdeck form. M for b of 1, d pf 40 323 ftkips from table 511 m forb of 1. Other than that, to develop a spreadsheet for the design of presstressed box girder bridges using balance cantilever method based on eurocode 2 to reduce working time. A half section of the bridge consists of a 10 parapet, a 60 sidewalk. It is applicable to a composite or noncomposite structure of moderate length with either rolled or fabricated sections and simple or continuous spans.
This three span precastprestressed girder example features a single long span in the middle along with two short side spans, as shown in. Bridge publications texas department of transportation. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. Loading single lane of class 70r or two lanes of class a. Design requirements for the network rail standard box girder bridge are given in documents available from network rail. Analysis of posttensioned concrete boxgirder bridges diva.
Precastprestressed concrete institute pci, chicago, il. The deck may consist of 3 girders spaced at 2, 45 m. Standard designs for precast concrete box culverts are available with, concrete box girder bridges j. Table 28 bridge outline 1 bridge name lawakha bridge basochu bridge nyarachu bridge bridge type simple composite steel i girder bridge pc box girder bridge pc box girder bridge bridge length 45. Sep 03, 2020 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 example illustrates the design of a two span castinplace posttensioned concrete box girder bridge. The design example is a fivespan precast segmental bridge with three 2000. Pgsuper is a computer program for the design, analysis, and load rating of precast, prestressed concrete girder bridges. Prestressed concrete bridge girder design examples. Singlespan castinplace posttensioned concrete box girder. Twin girder composite bridge 60 m 80 m 60 m c0 p1 p2 c3 note. Mar 27, 2019 attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steel girder bridge, and a cablestayed bridge.
Construction failure an overview sciencedirect topics. This design example has been extensively used over the years in the annual asbi design and construction of segmental concrete bridges seminar since its publication in 1996. These bridges present specific challenges to the designer that have to be addressed in the context of design codes, available materials, prevailing construction methods and project constraints. For medium span highway bridges, composite box girders offer an attractive. Reinforced concrete bridges concrete reinforcing steel. A threespan castinplace concrete box girder bridge shown in figure b. Design of reinforced concrete bridges department of civil.
The present document and others related to the research project. However, the maximum allowable stress in a deck is limited to 24 ksi per the adot lrfd. 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. Steel bridge tutorials computers and structures, inc. Furthermore, the optional moment redistribution specifications will be invoked. Mathematical modeling the mathematical model of a box girder bridge having a span of 30 m is shown in figure6. The purpose of this document is to illustrate how the pgsuper computer program performs its computations.
Failure of pier head during construction sent eight bridge girders onto road. This document consists of a comprehensive design example of a prestressed concrete girder bridge. The document also includes instructional commentary based on the aashtolrfd. Based on the findings and results of nchrp project 121, the. Mar 27, 2019 attached is a model file and a pdf which outlines the procedure for modeling a concrete box girder bridge, a steel girder bridge, and a cablestayed bridge. The earliest examples in the united states date to the 1930s. Abstract this document consists of a comprehensive design example of a prestressed concrete girder bridge. The use of 8 ksi concrete for prestressed i girders. Comprehensive design example for prestressed concrete psc girder superstructure bridge with commentary in us customary units this document consists of a comprehensive design example of a prestressed concrete girder bridge. Concrete box girder bridge design example pdf download. Prestressed concrete box beams distribution factor spreadsheet.
Used in cip posttensioned concrete box girder construction, deep bridge. Concrete boxgirder bridge model tutorials computers and. Design bridge girder us comprehensive design example. For highway bridges, the structural configuration is usually of a reinforced concrete deck slab, carrying the traffic, on top of steel girders. The substructure consists of integral end abutments and a multicolumn intermediate bent. Prestressed concrete box girders unsymmetrical sections. Posttensioned box girder design manual this manual contains information related to the analysis and design of castinplace concrete box girder bridges prestressed with posttensioning tendons. Computerised design of boxgirder bridge using balanced.
Csibridge 05 design of prestressed concrete box girders. Multimedia package for lrfd concrete bridge design rosa p. Optimum girder design step in addition, minor adjustments can download below chart is for the top flange. Pump at one on to design or box bridge design example pdf files which utilizes steel, asphalt concrete deck having a slab. It includes some pdf documents containing explanatory examples and an overview of the strategic development of this structural code. Concrete boxgirder bridges ryerson digital repository. Lrfd design example for steel girder superstructure bridge. For individuals with sensory disabilities, this document is available in. In addition to the beam design, the design of the concrete deck is also included. Hueste, mohammed safi uddin adil, mohsin adnan, and peter b. Concrete box girder bridges california department of transportation. Threespan continuous horizontally curved composite steel i girder bridge rivera and chavel 2015. The aims of this project is to develop a series procedure of box girder bridge using cantilever method design based on prestressed concrete design procedure. 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.
Bridge design guide 32 txdot january 2020 section 1 general recommendations prestressed concrete beam and girder design txdots policy is held firmly to a 6. Transverse design of adjacent precast prestressed concrete box. Comprehensive design example for prestressed concrete psc. Concrete boxgirder bridge model tutorials computers. Site location is assumed to be near socorro, new mexico, with the bridge crossing a waterway on a normal. Precast, prestressed girder design example pgsuper training 242020 1. In modern steel girder bridges, the two most common girders are ibeam girders and box girders. Elevation, plan and typical cross section of precast box girder bridges in the united states. Continuous prestressed concrete girder bridges volume 1. For precast or steel girders, show the typical structure depth at the centerline of bearing at the support. Each bridge is formed by steel girders acting compositely with a reinforced concrete deck slab. Only the design of slab bridge will be used for illustration.
1299 844 831 191 1769 634 1522 1350 658 1373 120 88 1090 706 1638 1094 1528 664 1534 1263 487 533 1399 1172 1597 1537 1097 842 563 1306 43 1169