Week 11 Challenge
Given Data:
1. Span of the bridge = 9m
2. Thickness of Deck Slab = 0.55m
3. Width of Deck slab = 7m
4. Height of Pier = 10m
5. Size of Pier = 2.5m dia
6. Size of longitudinal Box girder = 1.5m x 1.5m
7.Size of Pier Cap = 1.1m x 0.75m
8. Width of Pier Cap = 6m
Calculating the temperature load for the RC bridge with M40 grade to be constructed in Delhi.
As per IRC: 6- 2016 clause 215.2 fig 8 & 9.
Maximum temp. in delhi = 47.5 degree
Minimum temp. in delhi = -2.5 degree
Effective temprature difference
= (47.5+(-2.5)/2+10
= 32.5 degree
Stress due to temperature = α x deltaT x E
= 11.27 x 10^(-6) x 32.5 x 5000(40)^(0.5)
= 11.58kN/m2
Max permissible stress = (2/3) x 0.7 x √fck
= 2/3 x 0.7 x (40)^(0.5)
= 2.95kN/m2
Hence, the stresses are restricted to 3 kN/m2.
Positive temprature difference
Temperature at top = 47.5 degrees
Temprature at bottom = (2.1/17.8) x 47.5
= 5.60 degrees
Staad Pro Analysis:
First I created the model as per given data and assign there property as per given data, after that i assigned fixed support to the piers.
After that I go to the load case details where I first defined the Temperature load. In Temperature load I go to the Temperature loading, where I gave the value of 32.5 degrees in Temp change for axial alongation which I calulated eariler. And for temp difference from top to bottom I gave 5.6 degrees which I calulated eariler. After that i assigned it to the whole structure by using command assign to view.
After that I run the analysis command and go to the post processing mode. Where I 1st select the deck slab plates. And checked for the maximun bending moment in Mx direction. Where maximum bending moment in Mx direction is -18.172kN-m/m.
After that I again select the deck slab plates. And checked for the maximun bending moment in MY direction. Where maximum bending moment in MY direction is -10.84kN-m/m.
After that I again select the deck slab plates. And checked for the maximun shear force in SQX direction. Where maximun shear force in SQX direction is -25.76kN/m2.
After that I again select the deck slab plates. And checked for the maximun shear force in SQY direction. Where maximun shear force in SQY direction is 21.98kN/m2
After that I go to the beam result where I select the whole beam element. After that I go to the section forces where i checked for maximun bending moment in MY direction. Where I got maximun bending moment 6.004kN-m in MY direction.
After that I again go to the section forces where i checked for maximun bending moment in MZ direction. Where I got maximun bending moment 673.209kN-m in MZ direction.
After that I again go to the section forces where i checked for maximun shear force in FY direction. Where I got maximun shear force -99.191kN in FY direction.
