Week 9 Challenge

Aim : To calculate the values of wave loads on the structure and anlayse the model in Staad

Procedure:

Given

width of deck = 9m

Thickness of deck = 2m

Span of the btidge = 2m

I girder dimensions

width of flanges = 2.5m

Depth of girder = 1.7

Thickness of falnges and web = 0.5 m

Total height of strcuture = 7.0 + 1.7 + 2.0 = 10.7m

The storm surge elevation is given as 8.5 m

Difference between elevation of crest of maximum wave and elevation of centroid of Ah (Zh)

= ((2.0 + 0.2)/2)+0.8 =1.9 m

Difference between elevation of crest of maximum wave and elevation of underside of bridge deck (Zv)

= 2.8 m

Av = 9.0 * 12.0 = 108 m^2

Ah = 2.0 * 12.0 + 0.2 * 12.0 =26.4 m^2

Fv* = r * Av * Zv = 10 * 2.8 * 108 = 3024 KN

Fh* = r * Ah * Zh = 10 * 1.9 * 26.4 = 501.6 KN

Given Cva = 3

Cr = 0.4

N = 3

(FV)max = 3024 * 3 = 9072 KN

(FH)max = (1+ 0.4 (3-1))*3*501.6 = 2708.64 KN

(FH)max = 4514.4 / (12*2) = 112.86 KN/m^2

(FV)max = 9072/(12*9) = 84 KN/m^2

Staad

Model is generated using the given and assumed properties

The model is 9m wide and 12m lengthy with 3 I girders and a deck slab of 2m thickness

The 3D view of the model

the horizontal wave loads

The vertical uplift force

The analysis is error free

Stress ditribution diagram