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Copy of DESIGN & ANALYSIS OF BOX GIRDER BRIDGE
Transcript of Copy of DESIGN & ANALYSIS OF BOX GIRDER BRIDGE
A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle. The Oxford English Dictionary traces the origin of the word bridge to an Old English word brycg of the same meaning, derived from the hypothetical Proto-Germanic root brugjō. · Fixed span superstructure According to the flexibility of superstructure as fixed span bridges or movable bridges. CLASSIFICATION : · Movable span bridges According to the position of bridge floor relative to the formation level and the highest flood discharge as deck bridges, through bridges or semithrough
bridges. · Deck bridges · Through bridges · Semi through bridges According to the inter-span relations as simple, continuous or cantilever bridges. · Simply supported · Continuous · Cantilever · Arch · Slab
· Beam According to the form or type of superstructure as arch, beam, truss, slab, rigid frame or suspension bridges. · Girder · Truss · Suspension · Cable stayed According to the materials of construction used for superstructure as cement concrete, prestressed concrete, steel, masonry, iron, timber or composite bridges. According to the method of clearance for navigation as bascule, lift, swing or transporter bridges. · Movable – bascule bridges · Movable – swing bridges · Movable – lift bridges · Transporter According to the expected utility period of service as temporary, military or
permanent bridges. · Temporary bridges · Military (pontoon, bailey) · Permanent bridges According to the function as road, railway, road-cum-railway or
pipelinebridges. · Pin-connected According to the method of connections adopted in steel bridges as riveted, welded or pin-connected bridges. · Riveted · Welded According to the length of span as culvert, minor bridges, major bridges or long span bridges. · Culverts (less than 6m) · Minor bridge (6 to 30m) · Major bridge (above 30m) · Long span bridge (above 120m) According to the degree of redundancy as determinate or indeterminate bridges. · Determinate · Indeterminate According to the level of crossing of highways and railways as over
bridges or under bridges. · Over bridge · Under bridge According to the loadings, the road bridges and culverts as IRC class A, class AA, class B. According to the alignment as straight or skew bridges. According to the road level relative to the highest flood level of the river below, particularly for a highway bridge · Causeway · High-level · Submersible SHAPE OF THE GIRDER BRIDGE A girder bridge, in general, is a bridge built of girders placed on bridge abutments and foundation piers. In turn, a bridge deck is built on top of the girders in order to carry traffic. There are several different subtypes of girder bridges: A concrete girder bridge ANALYSIS DESIGN CONCLUSION A Plate Girder Bridge Solid Slab Bridges
T Beam Bridges
Box Girder Bridges
Balanced Cantilever Bridge
Cable Strayed Bridges
Trussed Girder Bridges
Bowstring Bridges CONSTRUCTION CONSTRUCTION SHIVA REDDY AHAD RUTHVIND ROY * * ADVANTAGES : Very good torsional rigidity.
wide flanges may be used.
A non rectangular cross section can be used.
clean external surface. The cross section of the box girder bridge consists of top and bottom slab connected monolithically with vertical webs to form a cellular structure.The box girder may be composed of single cell or multiple cells,with or without side cantilevers. CROSS-SECTION Methods of analysis : Simple beam theory
Folded plate analysis
Finite strip analysis
Finite element analysis
Beams on elastic foundation Various parameters that are to be considered at the start of the drsign are: Constants Vs Variable depth
span to depth ratio
number of parallel box sections
shape and dimensions of each box girder,including no. of webs,vertical or inclined webs,thickness of webs,top and bottom flanges.
Accessibility / inspection of super structure In this project ,analysis and design of box girder bridge ,the structural behavior of box girder bridge under static loads is observed. The response of box girder bridge in terms of bending moment,shear force etc etc is studied by varing the span,width of the top slab. keeping in view the different parameters the design is done which comes after finishing the analysis. Bibliography www.wikipedia.org/ http://www.youtube.com/ http://www.engineeringcivil.com/ SATHISH *