Week 6 Challenge

Aim: Calculate the pipe loads for the bridges and apply the pipe load in Staad.pro.

Given data:

Location: Narmada River

Width of bridge: 3m

Diameter of pipe 1: 700mm

Diameter of pipe 2: 200mm

Length of bridge: 24m

Pipe type: Class k9 DI pipe

Unit weight of class 700 k9 DI pipe: 2.17KN/m

Unit weight of class 200 k9 DI pipe: 0.452KN/m

Theory:

The total design weight load of pipe supports includes the weight of the pipe, fittings, insulation, fluid in pipe, piping components such as valves, valve operators, flanges, and so on, and the supports themselves.

Dead load: A constant load in a structure (such as a bridge, pipe, building) that is due to the weight of the member, the supported structure, and permanent attachments.

Live load: The live load on the bridge, is moving load on the bridge throughout its length.

Calculation:

Self weight of 700mm pipe for 24m span = 2.172*24

= 52.128kN

Self weight of 200mm pipe for 24m span = 0.452*24

= 10.848kN

Live load of water 700mm pipe = *0.35*0.35*10

= 3.848kN/m

Live load of water 200mm pipe = *0.1*0.1*10

= 0.3148kN/m

Unit weight of 700mm pipe = 2.172+3.848

= 6.02kN/m

Unit weight of 200mm pipe = 0.452+0.3148

= 0.766kN/m

Take 2 node with the orientation of (0,0,0) and (0,0,3)

Translational repeat in X direction no. of steps 8 spacing 3m with link steps.

Add beam to join cross girder

Translational repeat in -Y direction no. of step 1 spacing 7m with link steps.

Provided in bottom of pier fixed support

Translational repeat no. of step 1 spacing 3m with link steps.

Add mid node in top and bottom of cross girder.

Add beam and create truss member all four side of box girder.

Translational repeat in Zdirection no. of step 1 spacing 2m for 700mm pipe.

Translational repeat in Z direction no. of step 1 spacing 1.36m for200mm pipe.

Add beam to join all node for 700mm pipe.

Add beam to join all node for 200mm pipe.

Add section database from Indian standard

Section detail of truss member ISA 50x50x6 material steel

Section detail of vertical girder ISA 75x75x6 material steel.

Section detail of bottom cross girder ISWB250 material steel.

Section detail of top cross girder ISMC 200 material steel.

Section detail of top main girder ISA 65x65x6 material steel

Section detail of bottom main girder ISA 90x90x6 material steel

Section detail of pier 0.5x0.5m material concrete.

Section detail of pipe beam ISMC250 material steel

Add 1 load cases details class k9 DI pipe.

Add UDL for pipe 700mm dia. In global Y direction -6.02kN/m.

Add UDL for pipe 200mm dia. In global Y direction -0.7668kN/m.

Select 700mm dia. Pipe beam and assign UNI GY -6.02kN/m.

Select 200mm dia. Pipe beam and assign UNI GY -0.7668kN/m.

Add load case 2 self weight in Y direction factor -1 and assign selected all beam.

Go to define command and perform analysis.

Go to run analysis and run it then click go to postprocessing mode.

Result:

Reaction of beam

Maximum displacement is 0.110in beam no. 75 load case no 1.

Maximum bending X In direction beam no. 53 load case no. 1 value 17.499 kip/in2.

Minimum bending in X direction no. 78 load case no. 1 value 0.417 kip/in2.

Maximum bending in Z direction no. 113 load case no. 1 value 4.082 kip/in2.

Minimum bending in Z direction no. 16 load case no. 1 value -4.369 kip/in2.

Maximum bending in Y direction no. 47 load case no. 1 value 8.236 kip/in2.

Minimum bending in Y direction beam no. 38 load case no. 1 value -8.293 kip/in2.

Maximum axial force beam no. 29 load case no. 1 value 105.443 kN.

Minimum axial force beam no. 78 load case no. 1 value -44.226 kN.

Maximum shear Y beam no. 151 load case no. 1 value 10.062 kN.

Minimum shear Y beam no. 136 load case no. 1 value 0.417 kN.

Maximum shear Z beam no. 159 load case no. 1 value 17.622 kN.

Minimum shear Z beam no. 153 load case no. 1 value 0.583 kN.

3D