Design a solid slab bridge superstructure having a clear span of 9. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Beams of width and depth are provided on all column lines. Design of bridge slab spreadsheet engineering books. Check this box if the structural slab thickness should be used to compute section properties for rating. Ease of construction resulting from the simplicity makes this the most economic type for short span structures. Slabs may be solid of uniform thickness or ribbed with ribs running in one or two directions. Continuous span reinforced concrete slab bridge vdot. Reinforced concrete slab bridges design considerations haunched slabs straight haunches preferred in lieu of parabolic depth at pier should be 2 2. Li university of michigan, ann arbor, michigan, usa abstract the poor durability of concrete bridges throughout the us is an increasingly large concern for highway transportation authorities. Problem of design of deck slab bridge part 12 youtube. Solid slabs can be designed and produced with mild reinforcing or by adding prestressing strands. Approach slab design steps of rcc solid slab bridge i. Nov 23, 2015 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.
Planning and preliminary design of slab bridge ref. Simple span reinforced concrete slab bridge rating example. Design of bridge slab spreadsheet engineering discoveries. The effective width equations in the aashto standard. 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. Flat slab analysis, design and detailing pdf civil engineering. Irc 5 select type of slab, railing, wearing coat and materials require.
Voided slab bridges above a span of about 1012 m, the dead weight of a solid slab bridge starts to become excessive. Solid slabs are fully customizable concrete slabs of varying width, length and thickness. The 1939 text reinforcedconcrete bridges noted that the simplest design of floor construction for a through bridge consists of a slab spanning between the main girders. If the soil is unsuitable to hold the slab load design, pontex is used which in turn will create a one directional.
Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. Design and study on behaviour of skew slab bridges with. With decreasing budget allocations for infrastructure. The integral wearing surface is considered in the weight calculations. Solid slab bridge is structurally very strong, rigid and safe. A comparative design of reinforced concrete solid slab. Design of reinforced concrete solid slab bridge civil. This type of through girder structure with a solid slab continued to be illustrated in design texts well into the 1930s figure 19. A comparative design of reinforced concrete solid slab bridge for. Design of reinforced concrete structures ii twoway slabs 1 1. Voided slab and beam and slab bridges are used for larger, single or multispan bridges.
Solid slabs also have good distribution properties which make them efficient at carrying concentrated movable loads such as wheel loads for highway bridges. Therefore from slab design view point it is better to go for continuous two or. Reinforced slab bridge designaashto allowable stress design. 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. Hi there, now, before i write about the purpose of solid slab, i would like to write about what is a slab. Longitudinal steel should be detailed in a 2bar alternating pattern, with one of the bars continuous through the slab.
Tech scholar, structural engineering, malla reddy engineering college autonomous, secunderabad. Solid slabs and mouldings of mineral materials containing plastic, for building purposes and interior design, and for making furniture gigafren it is shown that the equivalent solid slab thickness obtained from consideration of inplane forces is also applicable to transverse shear deformations, provided that the usual approximations of. For narrower bridges, significant weight saving can be achieved by using relatively long transverse cantilevers giving a bridge of spine beam form as shown in figure 1. Composite design provides an advantage in reducing the necessary section of primary members and also serves to significantly stiff en the bridge. Reinforced concrete design 1 design of slab examples and. After reading this article you will learn about the design of slab and girder bridges. The design principles of a solid slab bridge deck may be illustrated by the following illustrative example. Double tee bridge beams 157k, pdf next bridge beams 104k, pdf pci zone 6 curved spliced girders 1. General arrangements of deck of solid slab bridge railing kerb wearing course cw d rc slab drainage spout expansion joint d rc slab tar paper abutment approach slab design steps of rcc solid slab bridge i. Reinforced concrete solid slab bridge by mak guo shao, bridge engineer. Bridge design reinforced concrete bridge deck design.
A civil engineer should study these lectures and materials for structural engineering acumen. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 43 for this example, a slab thickness of 8 in. If the outtoout width of a slab bridge exceeds 45 ft. The capacity of solid slab bridges in shear is assessed by comparing the design beam shear resistance to the design value of the applied shear force due to the permanent actions and traffic loads. These materials are originally located at different websites. A detailed study on variation of bending moments in simply supported skew slab bridges with various skew angles is given in this project using structural analysis software staad pro, and analysis is as per provisions of indian codes irc 6. The slab has to carry a distributed permanent action of 1. E dge beam design is required for bridges with open joints and possibly at stage construction lines.
According to the way loads are transferred to supporting beams and columns, slabs are classified into two types. Notes author staff bridgesight software sponsor bridgesight software. A concrete slab is a 4 to 20 inch thick common structural element which is used to make floors up to a height. 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 click th. 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. Design and field demonstration of ecc link slabs for jointless bridge decks michael lepech and victor c. Bridge approach slab analysis and design incorporating elastic soil support presented by. General overview of posttensioned concrete design instructor. Reinforced concrete design 1 design of slab examples.
Deck is 46 ft wide with a 15 degree skew roadway is 44 ft wide type t501 rail 0. This help file describes input and analysis features of slab bridge designer 2. Pci has developed preliminary design charts in accordance with the aashto. Reinforced and prestressed concrete are used extensively in bridge projects. Problem of design of deck slab bridge part 12 duration. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Two design examples of a simply supported slab bridge and a twospan box girder bridge are also presented. Pdf rcc bridge and culvert design paul tom academia. Modifications of these girders or other girder types may be proposed for use in special circumstances and shall have the approval of the state bridge. Slab bridges, due to camber required to address future creep. Solid slab bridge decks are most useful for small, single or multispan bridges and are easily adaptable for high skew. Feasibility study recently, a feasibility study 4 was undertaken to investi gate the structural efficiency of a waffle slab bridge system in comparison with conventional alternatives, namely the solid slab bridge and the slabongirder oneway, ribbedslab bridge.
Title reinforced concrete slab design using the empirical method publication no. Design step 4 design of deck prestressed concrete bridge design example task order dtfh6102t63032 41 design step 4 deck slab design design step 4. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Bt63, and bt72, as well as solid and voided slab beams. The design of bridge should follow the standard design practices mentioned in the irc and.
Applying these provisions to the design of deck slabs rarely controls deck slab design. Simple span reinforced concrete slab bridge rating example vdot. The basic bridge geometry can be found on the bridge layout and 75 slab span details see the appendix, pages 21 and 22. If this box is not checked, the rating will use section properties computed. Slabs are usually used in floor and roof construction. Solid slab bridges are horizontal beams supported at each. Minor bridge bridge having a total length up to 60 meters. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Only the design of slab bridge will be used for illustration. Here analysis of voided deck slab and cellular deck slab. The various parameters like total bay weight, flexural reinforcement, solid perimeter, moment capacity of the. The following table of prestress losses is recommended for the design of posttensioned members, and does not include friction or wedge set.
Ice manual of bridge engineering ice virtual library. A debonded zone under the link slab equal to 5% of the two adjacent girder spans to prevent stress concentrations was suggested 9. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Such type of decks has the following advantages over other type of superstructures. The solid slab is the simplest form of reinforced concrete bridge deck. Pdf in general reinforced concrete slab type deck are often referred to. The minimum spacing of reinforcing bars should preferably be 6 in. A comparative design of reinforced concrete solid slab bridge for different spans g. In this project we have adopted void slab bridge, as the traffic volume is less and to reduce the thickness of the slab. They can be used in a variety of applications such as bridges, piers, building floors.
A comparative design of reinforced concrete solid slab bridge. Bending will take place in the two directions in a dishlike fo. Bss090119991 abstract this design example illustrates the empirical design method for composite concrete bridge decks specified in article 9. Oneway solid slabs 50 45 45 40 twoway solid slabs 4548 4045 na na. Continuous solid slab bridges are economical for shorter spans while. Arguably, slab bridge is one of the oldest types of bridge, and the speaker wishes to share some of his experience and thoughts in designing the superstructure of a reinforced concrete solid slab bridge. Reinforced concrete slab design using the empirical method. Reinforced slab bridge designaashto allowable stress. Assign depth of slab using deflection control criteria and sizes of carriageway, footpathkerb, wearing coat and railing.
Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. A monolithic reinforced concrete floor is to be composed of rectangular bays measuring, as shown. Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. Design of reinforced concrete structures ii twoway slabs. Concrete slab bridges maryland state highway administration. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type. In addition to general design guidance and information on detailing practices, this section contains three design examples. The design concepts underlying such bridges are presented. Analytical study of solid flat slab and voided slab using. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported.
Specifications and aashto lrfd bridge design specifications are perceived to be overly conservative. Design and field demonstration of ecc link slabs for. Aug 03, 2017 determine live load bending moment for irc aatrack load for bridge by parag pal duration. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Slab bridges are defined as structures where the deck slab also serves as the main loadcarrying component. Ramakrishna2, associate professor, department of civil engineering, malla reddy engineering college autonomous, secunderabad. Dec 02, 2017 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 click th. Lrfd slab bridge design procedure, equations, and outline. A decrease in moments from solid to voided slabs is about 11%, 7% and 5. The void slab bridge is the answer to problems in steel concrete such as heavy weight.
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