Project 1

Aim: To calculate the loads acting on the bridge mainly dead, live loads, seismic loads, earthpressure, wid loads and to apply on the given model

Procedure:

Given Data :

The unit weight of soil as 18 kN/m3

Unit weight of concrete = 25 kN/m3

Length of the structure = 10.0m

The structure is modelled in STAAD.Pro and Fixed supports are assigned.

Self weight option is used for calculating the dead load

Calculation of Live load (Metro Rail Loading):

Axle loading = 17t

max nos of cars = 6 numbers

wheel configuration of the metro vehicle is used

Live load is aapplied by using the option

Definition -> Vehicular Definition

Load generation = (Span + Length of train )/ load increment

Let us assume load increment as 0.5

Load generation = (10+21.1)/0.5 =64 generations are made

Active Earth pressure= 0.35 x 18 x (20-1.5) = 116.55 kN/m2

since no value is given for calculation of earth pressure assumed Ka as 0.35

For wind load calculations

vz=vb*k1*k2*k3*k4

k1=1.06

k2=1.0

k3=1.0

k4=1.3

Vz= 36*1.06*1*1*1.3 =53.742 m/sec

pz=0.6*53.742*53.742 =1732.48 n/m^2

in terms of udl = 1.732*1.5 = 2.598 KN/m

This pressure is applied in +x direction and -ve x direction

Seismic Definition

the seismic factors are defined in the STAAD pro as shown in the figure

the seismic load case is added first since the loads are defined and is mandatory to apply first

After doing analysis there are no errors

Post processing

Maximum stress in the vertical wall is observed at the fixed region of bottom slab.