bridge

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INTRODUCTION Bridges are normally constructed using precast concrete beams. Prior cast design of the beam should be done. Hence structural analysis part plays a major role here. SAP 2000 is a reliable software that could be used for analyse a bridge. In this assignment a selected bridge has analysed using SAP 2000. Here the bridge is analysed using grillage analysis. SELECTION OF PROBLEM PARAMETERS AND MEMBER SIZES Index number : 090104 E Therefore length of the bridge = 20 + (104/100) = 21 m Grade 40 concrete is used. Longitudinal Beam: M beams are required to use. Therefore for 21 m span M4 beams will be sufficient. Section of a M4 beam is drawn below. Depth of the beam is 880mm. Note : All the dimensions are in mm. 400 300 60 80 80 50 16 97 10

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sap bridge report

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INTRODUCTIONBridges are normally constructed using precast concrete beams. Prior cast design of the beam shouldbe done. ence structural analysis part plays a ma!or role here. "#P $%%% is a reliable soft&are thatcould be used for analyse a bridge. In this assignment a selected bridge has analysed using "#P $%%%.ere the bridge is analysed using grillage analysis."'('CTION O) PROB('* P#R#*'T'R" #ND *'*B'R "I+'"Inde, number - %.%/%0 'Therefore length of the bridge 1 $% 2 3/%04/%%5 1 $/ m6rade 0% concrete is used.(ongitudinal Beam-* beams are re7uired to use. Therefore for $/ m span *0 beams &ill be sufficient. "ection of a *0beam is dra&n belo&. Depth of the beam is 88%mm.Note - #ll the dimensions are in mm.'9en though the &idth of the lo&er flange of the beam is .:%mm in the "#P model it is ta;en as/%%%mm since bet&een t&o beams there is a %/=% ? /8> 1 ::% mm@idth of the beam - / mCRO"" "'CTION O) T' BRID6'Note- #ll the dimensions are in mm.Therefore /% longitudinal beams are needed and hence the length of the bridge is $/ m $$ trans9ersebeams are needed for the grillage.PROC'DUR'Step 1:Units &ere selected as ;NA mA C. Ne& modal &as selectedA under that grid only selected. Number ofgridlines &as entered as B C$A D C$A and + ? $. 6rid spacing &as entered as B C /A DC/ and + ? /.Step 2 :*aterial properties and section properties &ere entered. @hen entering sectional data for the * beamAtorsion constant should gi9en as Eero as this bridge is to be designed as torsionless system./%%%::%* beams/>%% %%%%/>%%/%%% >%%Fehicle lane$Pa9ement$Fehicle lane/Pa9ement/Step 3:)ollo&ing model &as de9eloped.Step 5:Rele9ant load cases &ere defined and loads &ere appliedType # loading-%/. Type # uniformly distributed load. 3Reference Table /< B" >0%%- Part $- /.:85(oad length is less than ;N4mshouldbeappliedassameasabo9eintroducing t&o load cases as Ped/ and Ped$.%$. Gnife edge loading-Nominal loading is considered as /$% ;N4lane.Therefore ;nife edge loading on a trans9erse beam 1 3/$%45 1