Week 10 Challenge

1.Introduction:-

Snow load load is also an important load in cold areas. In this session we learn what is snow load , how is it work or effect the bridge and how to apply on the bridge .

For snow load is india Is 875 Part -IV ,shall be consider for Design load consideration due snow .

According to IS code snow density may be classified into given below type

1. New snow immediately 0.5-0.7 kn/m3

2.Damp new snow 1-2 kn/m3

3.Settled snow 2-3 Kn/m3

4.Depth hoar snow 1-3 kn/m3

5.Wind packed snow 3.5-4kn/m3

6.Firn 4-8.3kn/m3

7.Very wet snow and firn 7-8kn/m3

8.Glacier Ice 8.3-9.17kn/m3

In given data 1condition from uper given select according location or data will given by client . Select the density of snow and calculate with area and apply with help of staad pro and calculate the deflection , shear force ,bending moment etc.

2.Given Data :-

Bridge Span - 10m

Width if Bridge - 18m

no of Girder - 4

Slab thickness - 0.9m

Pier Support - Fixed Support

Angle With Flat slab (B) - <30

Snow Density (Settled snow) -3kn/m3

Assume

Pier Dia -2m

Length of pier -5m

3.Procedure :-

Now from given data we calculate the Snow load as per IS code

Snow Load on Ground `S0=gamma*Depth of Snow`

=3*0.950

=2.85 Kn/m2

For Design Snow Load =`mu`*Snow load on ground

`nbsp; =0.8*2.85 kn (For <30 u =0.8 as per Is code`

=2.28 kn/m2

Now we get the load point load for plates section

Now As Per Given Data ,Create the model and Apply the load and get the results as per required data

Steps:-

1.Open the Staad pro and Create new model as name created as "Snow load "

2.As we select the Create a new window has been open as showing

3. Put the 0,0,0 for orign point

4. Create pier so need second point in Y-Direction as showing as

5.Select the Add Beam command for create column

6.Use of translation command create remaining pier easly as showing steps .

7.Apply the Properties as in starting we assume that dia of pier is 2m and material concrete. Create the properties and apply to pier as showing in given steps .

8.Now create the main girder and cross girder with help of "add beam ".

9.Now create the properties for main girder and cross girder. There is no specify properties so we assume as main girder are 300 mm and depth are 700mm and cross girder are 300mm width and depth are 500mm .and apply to main girder and cross girder

10.Now create the plates for slab over the girder with the help of plates section as given below steps

11. Now apply the properties for plates properties and get given for steps

12. Apply the supply reaction at bottom of pier as fixed support .

13. Now Modeling has been complited . Now we apply the snow load . For apply the snow now we follow the given below steps as

14.Go to loading section as

15. Go to load case details and click on "add" for create new load cases

16. New a load case has been created .Now again select the load case and select the "add" as showing

17. A new window has been opned, select the plate for apply the point load as we calculated in starting

18.Put the - direction for down word direction and put the values and add and close the window

19. Load has been created . Now apply over the slab .for apply load select the plates and assign

20. Now Run the analysis

21. There is no error so we can go for results as showing "select the post processing mode" for get the results .

22. Select the "postprocessing mode " for results due to plates load due to snow load .

23.Select the Apply for select the load as here only "snow load " so select and apply .

4.Results :-

1.Displacement due to snow load on the slab .

2.Deflection due to snow load on slab .

3.Deflection in suport column and beam, due to Shear force in X-Direction .

4.Deflection in suport and Beam due to shear force in Y-direction .

5.Deflection in Beam and Column due to shear force Z-Direction

6.Mending monent in beam and column due Snow load on deck of Bridge .

7.Deflection Due to moment in Y-Direction

8.Deflection due to Moment in Z-Direction

9.Plates results due to max Absolute

10.Report

Note -Pdf copy also attached with results .

11.Model also attached with results

5.Conclusion:-

By given steps we can calculate the snow load over the bridge with help of Staad pro as given here .

Snow load is also an imporant load will effect the structure during snow fall. there is mani part is consider the type of snow fall .

before start loading consideration should confirm that we apply load are enough for that location .