Week 9 Challenge
Given Data:
Maximum crest elevation for the wave = 3m
Number of longitudinal I - girder are 3 Each I Girder is 1.7 m height with a top and bottom flange width of 2.5m. The thickness of flange and web is 500 mm
Storm elevation = 8.5m
Span of the bridge = 12m
Width of deck slab = 9m
Thickness of deck slab = 2m
Size of Pier = 2m dia (Assumed)
Height of Pier = 7m
r = 5
cva = 3
cr = 0.4
Wave load Calculation:
Max creast = 3m
`delta`Zh = ηmax - Centriod of I Girder`
= 3 - (1.7/2)
= 2.15m
`delta`Zv = ηmax - Elevation of bottom deck slab
= 3 - 1
= 2m
Vertical Load, Fv = r x delta Zv x AV
= 5 x 2 x ( 9 x (1.7/2)
= 76.5 kN
Horizontal Load, Fh = r x delta Zh x Ah
= 5 x 2.15 x (3 x 12)
= 387 kN
Maximum vertical load, Fvmax = cva x Fv
= 3 x 76.5
= 229.5 kN
Maximun Horizontal load, Fhmax = (1+Cr(N-1)xCva x Fh
= (1+0.4(3-1)x3x387
= 929.8 kN
Staad Pro Analysis:
First I created the model as per given data and assign there property as per given data, after that i assigned fixed support to the piers.
After that I go to the load case details where I first defined the Wave load. In wave load I go to the nodal load where I first defined the maximum horizontal load 929.8kN in Fz direction which I calculated earlier. After that I select the two nodes in x direction and assigned it to the selected nodes.
After that I again go to the nodal load where I first defined the maximum vertical load 229.5kN in Fy direction which I calculated earlier. After that I select the two middle nodes in each bay in x direction and assigned it to the selected nodes.
After that I run the analysis command and go to the post processing mode. Where I 1st select the deck slab plates. And checked for the maximun bending moment in Mx direction. Where maximum bending moment in Mx direction is 914.957kN-m/m.
After that I again select the deck slab plates. And checked for the maximun bending moment in MY direction. Where maximum bending moment in MY direction is 142.651kN-m/m.
After that I again select the deck slab plates. And checked for the maximun shear force in SQX direction. Where maximun shear force in SQX direction is 190.919kN/m2.
After that I again select the deck slab plates. And checked for the maximun shear force in SQY direction. Where maximun shear force in SQY direction is 156.171kN/m2
After that I go to the beam result where I select the whole structure having beam element. After that I go to the section forces where i checked for maximun bending moment in MY direction. Where I got maximun bending moment 1958.938kN-m in MY direction.
After that I again go to the section forces where i checked for maximun bending moment in MZ direction. Where I got maximun bending moment 351.091kN-m in MZ direction.
After that I again go to the section forces where i checked for maximun shear force in FY direction. Where I got maximun shear force 57.929kN in FY direction.
After that I again go to the section forces where i checked for maximun shear force in FZ direction. Where I got maximun shear force 482.611kN in FZ direction.
