Week 6 Challenge
Aim: Calculate the given Pipe loads, Generate the Bridge model with the given Dimensions and analyse the structure using Staad
Procedure:
Given
Width of the Deck = 3 m
Span = 24m
Dia of Pipes = 700 Dia and 200 dia pies
Cross girders for every 3 m
A truss modelled Bridge
Assuming the cross-sections as
ISMB 300 for the Piers
ISMB 250 For the Main and Cross Beams, vertical members
ISMB 200 for Bottom and top Chord bracings
ISMB 100 for Side Bracings
Deck slab thickness as 250mm
Calculations
Unit weight of Steel = 78.5 KN/m^3
C/s Area of 700mm Dia pipe = 3.14*0.7*0.7*0.25 – 3.14*0.629*0.629*0.25 = 0.0741 m^2
C/s Area of 200mm Dia pipe = 3.14*0.2*0.2*0.25 – 3.14*0.179*0.179*.25= 0.006248 m^2
load of NB 700 pipe = 0.0741 * 78.5 = 5.9 KN/m
In a metre I have 6 nodes and this load is equally distributed on all 6 nodes = 5.9/6= 1KN
load of NB 200 pipe = 0.006248 * 78.5 = 0.49 KN/m
In a metre I have 6 nodes and this load is equally distributed on all 6 nodes = 0.49/6= 0.1KN
Water load in the water 700 NB = 3.14 *0.7*0.7*0.25 = 0.38465 m^2
Water load in the water 200 NB = 3.14 * 0.2*0.2*0.25 = 0.0314 m^2
load of NB 700 pipe = 0.38465 * 10 = 3.8465 KN/m
In a metre I have 6 nodes and this load is equally distributed on all 6 nodes = 3.8465/6= 0.641KN
load of NB 200 pipe = 0.0314 * 10 = 0.314 KN/m
In a metre I have 6 nodes and this load is equally distributed on all 6 nodes = 0.314/6= 0.524KN
Total load of 700 NB pipe = 1+0.641 = 1.641 KN
Total Load of 200 NB pipe = 0.1+0.524 =0.624 KN
Model generation:
A Bridge model is generated using the given calculations
model generated in isometric view
Front view showing the side bracings
Top view showing the top and bottom chord bracings
ISMB 250 property is assigned to all the main members
ISMB 100 is assigned to Side bracings
ISMB 200 is assigned to bottom and top chord members
ISMB 300 is assigned to piers
Seismic Definitions is defined
Since truss type structure the Nodal loads are applied
The analysis popup showing that the analysis is successful