Week 10 Challenge

Aim: To apply the snow load on the bridge and analyze the bridge in staad pro.

Given data:

The span of the bridge=10m

Width of the bridge=18 m

The deck of the bridge is flat with slope <30 degree

The depth of accumulation of snow is 1250 mm

Assumed Data:

Consider the pier having a diameter of 1.5 m.

Size of cross girder = 0.6 x 1.2 m.

Size of Longitudinal girder = 0.6 m x 1.2 m.

The thickness of the deck = 0.2 m.

Height of pier = 10 m.

Solution:

Consider the density of snow as 9 kN/m3.

As the slope of the deck is less than 30 degrees, so shape coefficient is 0.8 m.

Total snow load to be considered on top of bridge deck = (depth of accumulation of snow)x(density of snow)x(shape coefficient)

=1.25 x 9 x 0.8 =9 kN/m2

Structural modeling & analysis in Staad pro.

Using the specifications of the bridge given in the question, staad model is prepared.

The properties of the different members assigned is shown below.

The snow load is applied as pressure on the plate as shown below.

Support Condition is considered as fixed.

Results:

(Bending Moment Diagram)

Maximum Bending Moment observed in Cross Girder = 112.518 kN.m

Maximum Bending Moment observed in Longitudinal Girder = 249.89 kN.m

Maximum Bending Moment observed in Piers = 297.806 kN.m

Maximum bending moment observed in deck =24 kN.m/m