Design steps for slab and edge beam a slab design span length span length, s centre to centre distance of the supports. Wisdot bridge manual chapter 18 concrete slab structures january 2019 188 18. The original bridge and structures design manual was created through the publicprivate partnership of the georgia department of transportation and the consulting engineering companies of georgia. In addition to this, during construction of the bridge, we established practices for traffic control in. The integral wearing surface is considered in the weight calculations. Reinforced concrete slab design using the empirical method bridgesight solutions for the aashto lrfd bridge design specifications bridgesight software tm creators of effective and reliable solutions for the worlds bridge engineers. The approach slab serves as a bridge between the roadway and the primary bridge and is intended to reduce the annoying and sometimes unsafe bump that is often felt when approaching and leaving a bridge. A comparative design of reinforced concrete solid slab bridge. Again, there is some overlap between the two, but basically the information manual is more. Bridge approach slab analysis and design incorporating elastic soil support presented by. Reinforced concrete slab design using the empirical method. These examples are modifications of the bridge approach slab base sheets. Tutorials on bridge design and assessment with examples.
Reinforced and prestressed concrete are used extensively in bridge projects. Case study design of a concrete bridge 147 chapter 9. Bridge approach slab detail examples examples of approach slabs with a range of different abutment types, barrier types, and drainage inlet locations are found below. The minimum spacing of reinforcing bars should preferably be 6 in. Comprehensive design example for prestressed concrete psc girder superstructure bridge design step 7 design of substructure design step 7. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type. Generally, reinforced concrete deck slabs are the most often used type of deck for steel bridges. In the case of the slab, the origins are found in prehistory, as in the ancient clapper bridges of dartmoor and dartmeet, england whitney 1983. Single, double or triple cell boxes, of equal spans, may be analysed on fixed or spring foundation supports. This help file describes input and analysis features of slab bridge designer 2. Eight walls spaced 11 feet apart bring total loads of 120 kips each from the stiff deck to a concrete arch below.
Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Longitudinal steel should be detailed in a 2bar alternating pattern, with one of the bars continuous through the slab. The selection criteria of bridge railings and the railing details included in chapter 5 of ladotd bridge design manual 4th english edition shall be followed. Revised to conform with the latest fifth edition of the american association of state highway and transportation officials aashto. The arch is a concrete slab that is 8 inches thick and 16 feet wide throughout the. This spreadsheet enable you to design bridge slab bending moments, shear and axial forces for loads on a buried concrete box structure, as described in bd 3101, are calculated. Comprehensive design example for prestressed concrete psc. Tech scholar, structural engineering, malla reddy engineering college autonomous, secunderabad. Plan n design free drawings, autocad, autocad drawings. Bridge design free download as powerpoint presentation. Check this box if the structural slab thickness should be used to compute section properties for rating. A comparative design of reinforced concrete solid slab bridge for. If this box is not checked, the rating will use section properties computed.
Late in the 1970s, cablestayed construction raised the bar for concrete bridges. This system used load and resistance factors to ensure a stable bridge with sufficient strength. Slab and girder bridges are used when the economical span limit of solid slab bridges is exceeded. Reinforced slab bridge designaashto allowable stress design. E dge beam design is required for bridges with open joints and possibly at stage construction lines. Design of reinforced concrete bridges department of civil. Pdf the texas department of transportation txdot uses precast prestressed concrete slab beam bridges in a sidebyside configuration.
Bridge slab design spreadsheet civil engineering downloads. Ultrahigh performance fiber reinforced concrete elements pdf. En 19942 same effectives width b eff for sls and uls combinations of actions steel flange. Slab bridge definition of slab bridge by merriamwebster. Mar 01, 2012 bridge engineering handbook is a unique, comprehensive, and the stateoftheart reference work and resource book covering the major areas of bridge engineering with the theme bridge to the 21st century. Slab bridges, due to camber required to address future creep deflection, do not ride ideally for the first few. For concrete slab design, the slab dimensions and the size and spacing of reinforcement shall. Slab bridge definition is a shortspan bridge consisting of a reinforcedconcrete slab resting on abutments. Pdf design and behavior of spread slab beam bridges. Bridge design manual lrfd 22 txdot 012020 chapter 2 limit states and loads section 1 limit states section 1 limit states importance factor classify all bridge designs as typical bridges when applying the operational importance factor. This manual is also complementary to the bridge branch design information manual. A basic introduction to the design codes and methods of anlysis.
Design a solid slab bridge superstructure having a clear span of 9. Ramakrishna2, associate professor, department of civil engineering, malla reddy engineering college autonomous, secunderabad. Types and design methods of reinforced concrete bridges are presented. Concrete slab bridges as with most modern bridge forms, the slab bridge hearkens back to precursors from the remote past.
A comparative design of reinforced concrete solid slab bridge for different spans g. After reading this article you will learn about the design of slab and girder bridges. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Design of bridge deck slabs using glass fiberreinforced polymer gfrp bars of different grades. Nov 23, 2015 components of slab bridge slab footing abutment slab edge beam fig reinforced cement concrete slab bridge stringer 14. Integral abutments are used to eliminate expansion joints at the end of a bridge. En 199315 used for bottom flange of a boxgirder bridge different effectives width for sls and uls combinations of actions 3 options at uls choice to be performed in the national annex b eff,flange b flange. Only the design of slab bridge will be used for illustration. Continuous span reinforced concrete slab bridge vdot. For simply supported spans, this limit is generally found to be nearly 10 metres and for continuous or balanced cantilever type structures, this limit is 20 to. Concrete deck slabs can be constructed with castinplace or precast methods, and typically include mild steel reinforcement in the longitudinal and transverse directions.
The slab bottom soffit has a parabolic profile with minimum depth at midspan and maximum depth at pier. If the outtoout width of a slab bridge exceeds 45 ft. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. If this box is not checked, the rating will use section properties computed from the total deck thickness. The guidebook 2 is written in a userfriendly way employing only basic mathematical. The bridge is striped for two lanes, but there is a possibility that it could be modified or restriped in the future for additional lanes. The steel reinforcement in the concrete slab was improperly designed, resulting in. In addition to general design guidance and information on detailing practices, this section contains three design examples. Slab detail description example 1 jointless abutment with parapets, 20 degree skew ahead left. By 1982, the sunshine skyway bridge in tampa, florida, had set a new record for concrete bridges, with a main span of 365 m 1,200 ft. The bridge is a slabongirder type with a skew angle of 20 degrees over a. Specifically, the example illustrates the design of selected critical sections from an exterior girder at the strength, service and fatigue.
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