Simple span reinforced concrete slab bridge rating example. This is done by first left clicking the destination such as design load rating, legal load rating. Shown above are graphs depicting the aspect ratio of all flat slab bridges coded as having been. This design guide provides a procedural outline for the design of basic slab bridges using the lrfd code and also includes a worked example. According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. A precast reinforced concrete beam slab system is introduced as an alternative to traditional concepts like solid slabs or voided slabs. Design and field demonstration of ecc link slabs for jointless bridge decks michael lepech and victor c. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Design and field demonstration of ecc link slabs for. Design of reinforced concrete structures ii twoway slabs.
Solid slab bridges single spans bridge engineering. Select the straight bar type even if the bar has hooks at the end. The solid slab is the simplest form of reinforced concrete bridge deck. Length of the solid end bl ock at beam end lvar 176 in length where web is tabered from maximum. Design a solid slab bridge superstructure having a clear span of 9. The following table of prestress losses is recommended for the design of posttensioned members, and does not include friction or wedge set. Bss090119991 abstract this design example illustrates the empirical design method for composite concrete bridge decks specified in article 9. Ice manual of bridge engineering ice virtual library. A comparative design of reinforced concrete solid slab bridge for. In addition to general design guidance and information on detailing practices, this section contains three design examples. A decrease in moments from solid to voided slabs is about 11%, 7% and 5. With decreasing budget allocations for infrastructure. Design of reinforced concrete structures ii twoway slabs 1 1. Unless otherwise specified, all code references refer to the aashto lrfd bridge design specifications, 8th ed.
Solid slabs also have good distribution properties which makes them efficient at carrying concentrated movable loads such as wheel loads for highway bridges. 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. All manual modifications must be approved by the bridge design engineer. Unless otherwise noted, all referenced table, figure, and equation numbers are from that book. Continuous one way slab figure 1 shows a clear area of 12 m x 8.
Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 43 for this example, a slab thickness of 8 in. Bridge approach slab analysis and design incorporating elastic soil support presented by. Problem of design of deck slab bridge part 12 youtube. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Simple span reinforced concrete slab bridge rating example vdot. Only the design of slab bridge will be used for illustration. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Title reinforced concrete slab design using the empirical method publication no. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Reinforced slab bridge designaashto allowable stress.
I suggest you to listen to the video and make notes of your own, that makes you confident if you still want to download it, its not free please. A continuous 3span haunched slab structure is used for the design example. This chapter considers the following types of concrete structures. Typically the two uniform loads applied to a slab are a dc2 load for the barrier and dw load for the wearing surface. Comprehensive design example for prestressed concrete. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Types of reinforced concrete bridge reinforced slab bridges beam and slab bridges for short spans, a solid reinforced concrete slab, generally cast insitu rather than precast, is the simplest designup to about 25m span, such voided slabs are more economical than prestressed slabs. Main reinforcement in slab bridges is designed for flexural resistance 5. Wisdot bridge manual chapter 18 concrete slab structures. Ease of construction resulting from the simplicity makes this the most economic type for short span structures.
Aesthetics of bridge design fritz leonhardt professor, technische hochschule stuttgart stuttgart, germany. The integral wearing surface is considered in the weight calculations. The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation of the aashtolrfd bridge design specifications. Oneway solid slabs 50 45 45 40 twoway solid slabs 4548 4045 na na. The following example illustrates the design methods presented in the pca book simplified design reinforced concrete buildings of moderate size and height third edition.
Reinforced concrete slab bridges design considerations haunched slabs straight haunches preferred in lieu of parabolic depth at pier should be 2 2. Slab bridges, due to camber required to address future creep deflection, do not ride ideally for the first few. Worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010. Beams of width and depth are provided on all column lines.
Reinforced and prestressed concrete are used extensively in bridge projects. The design concepts underlying such bridges are presented. Opens the bridgeware association window allowing you to specify this current bridge as a virtis, opis or virtisopis bridge and also to link this current bridge to a bridge in the pontis database if pontis is installed. Two design examples of a simply supported slab bridge and a twospan box girder bridge are also presented. The following example illustrates the example building. Longitudinal reinforcement at the bottom at exterior strip. General overview of posttensioned concrete design instructor. The manual is based on the aashto lrfd bridge design specifications. This design example was edited in 2012 by hdr engineering, inc. Reinforced concrete design 1 design of slab examples. Specifications and aashto lrfd bridge design specifications are perceived to. Reinforced slab bridges used for short spans, a solid reinforced concrete slab, generally cast insitu rather than precast, is the simplest design to about 25m span, such voided slabs are more economical than prestressed slabs. A comparative design of reinforced concrete solid slab bridge. Prestressed concrete construction manual 3rd edition april, 2017 new york state department of transportation office of structures about the cover.
After reading this article you will learn about the design of slab and girder bridges. A sample analytical method for bearing resistance calculation. The slab is supported on beams of size 225 x 500 mm spaced at 4. The design principles of a solid slab bridge deck may be illustrated by the following illustrative example. Notes author staff bridgesight software sponsor bridgesight software. Here analysis of voided deck slab and cellular deck slab.
Tech scholar, structural engineering, malla reddy engineering college autonomous, secunderabad. Fill out the fields as appropriate based on the information in the plans see appendix a for the design plans. A comparative design of reinforced concrete solid slab. The selection of the type of concrete slab structure haunched flat is a function. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. However, since the example bridge does not have a wearing. Load and resistance factor design lrfd for highway bridge. A new look at short span reinforced concrete bridges presents the crsi view that the flat slab bridge, with or without haunches, is the most economical castinplace choice for short spans. The following design standards were utiliz ed in this example.
For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type. A comparative design of reinforced concrete solid slab bridge for different spans g. Design of bridge slab spreadsheet engineering books. Solid slab bridges single spans the solid slab is the simplest form of reinforced concrete bridge deck.
A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Aash to lrfd bridge design specification, 7th edition, 2014. This design should always be used unless approval to use a thinner deck is obtained from the state bridge engineer. Ibeam, and a threespan posttensioned concrete slab. Reinforced concrete slab design using the empirical method.511 665 1446 850 1196 1231 307 502 61 1532 997 1210 11 1366 201 868 105 1583 1454 758 1016 1112 549 826 913 730 179 404 834 360 512 1435 749 989 105 466 33 473 721 1142 507