Week 8 Challenge

Aim : To calculate the centrifuagal force of calss 70 R tracked vehicle for the given radius of curvature of the bridge and analyse the structure in STAAD

Procedure:

Given

span of the bridge is 12 m.

Width of carriage way is 7 m.

structure is subjected to Class 70R tracked vehicle

design speed of the vehicles (V) 75 km/hr.

radius of curvature (R) 3 m.

Centrifugal Force = (W*V^2)/(127R) = 700*75*75/(127*3)=10334.7 KN

Since the span is 12m the solid slab is Assumed with a thickness of 600mm

Assuming 3 beams of rectangular in shape with width as 1.5 and depth as 1.8 m

Staad model generation

the generated mesh is of 12m span and 7m width with the above mentioned properties

The 3d rendering of the super structure

the vehicle load is defined by adding the centrifugal force.

the vehicle moving load acts as shown above

The analysis is error free

The sharp triangle shaped variations are due to the pointed loads moving along the beam