Challenge

Week 6 Challenge

DDhiraj Satghare17 May 2021

Aim :- To Create Steel truss bridge model and Applying seismic & pipe load on it and performing analysis using STAAD.pro software.

* Manual Calculation of pipe load *

Given -

Widht of bridge is 3 M

Lenght of bridge is 24 M

NB DI pipe 700 mm Dia

NB DI pipe 200 mm Dia

Assumption for model -

Height of the pier is 7 Meter ( Concrete)

Top and buttom chord is ISMB 250

Vertical and strut is ISMC 200

Diagonal and top lateral bracing in ISA 90x90x8

To Find -

Total pipe load acting om pier

For 700 mm dia pipe

= 338.2 kg/m

= 3.38 Kn/m

Area of pipe

=`pi/4 (0.7)^2`

=0.38 `m^2`

Live load on pipe

= Area x Unit Wt of water

= 0.38 x 10

= 3.8

Total load of pipe

= Self Wt + LL load

= 3.38 + 3.8

= 7.18 Kn/m

For 200 mm dia pipe

= 60.1 Kg/m

= 0.601 kg/m

Area of Pipe

= `pi/4(0.2)^2`

= 0.031 `m^2`

Live Load on pipe

= Area X Unit Wt of Water

= 0.03 X 10

= 0.3

Total Load of pipe

= Self Wt + LL load

= 0.031 + 0.3

= 0.331 kn/m

* Modeling and Analysis using STAAD.Pro *

Step (1) :- Open a STAAD.pro software.

Open a STAAD.pro software.
Fill all detail about model in model information.
Then click on the create to open the model.

Step (2) :- Create Floor beam of steel struss model.

After opening STAAD.Pro software.
Create the first node.
Copy the node in global Z direction using translation repeat option.
Width of bridge is 3 meter which is given.

Step (3) :- Creating Bridge span.

First Select the beam.
Then Copy that beam in X direction using translation repeat option.
No of step is 8 and spacing is 3 meter and also click on the link step to connect all the beam.

Step (4) :- Creating Top chord and vertical for truss bridge model.

First select all the span.
And Copy the span in Y direction using translation repeatoption.
Height of the bridge is 2.4 meter which is given in cross-section plan.
No of step is one and spacing is 2.4 meter click on the link step to connect all the model.

Step (5) :- Creating Top lateral bracing and diagonal for bridge model.

First go to geometry and select add beam option.
Connect all the node using add beam option likewise in given plan.

Step (6) :- Adding pier and assigning the support to it.

Select end node of all four side of the.
Copy selected node in Y direction using translation repeat option.
Height of the pier is we assume 7 meter click ok to create.
Now, assigning support to the pier.
For that go to specification in this select fix support option. then click on add.
Select the support and assign it to the pier.

Step (7) :- Assigning property to the buttom and top chord component of the structure.

First go to specification then in right side of the window this window will shown.
In this window click on section Database then section profile table window will open.
Select indian option then click on S shape then select ISMB 250 property then click on add.
After that select buttom and top chord component of the structure and assign this property to it

Step (8) :- Assigning property to Vertical and strut component of the structure.

Repeat same procedur which is shown in step 6
Go to channel section in the select ISMC 200 which we assume earlier.
Select vertical and struct component of the structure and assign this property to it.

Step (9) :- Assigning property to top lateral bracing and diagonal component of the structure.

Repeat same procedur which is shown in step 6
Go to angal section in the select ISA 90x90x8 section which is our assemption.
Select top lateral bracing and diagonal component of the structure and then assign this property to it.

Step (10) :- Assigning property to the pier.

First go to specification in the select prismatic option then this window will open.
Click on circle option and assume 1.2 meter diameter size of the pier and select the material as concrete and click on add.
After select induidial all the pier and assign this property to it.
Hence, all propety is assign.

(3D Model)

Step (11) :- Applying Seismic load to the structure.

Go to loading option in loading option this window will shown right side of the window.
In that window go to defination in that select seismic defination and click on add.
Then Seismic defination window will open.
First select IS 1893 (part 1):2016 indian code and then click on generate option and this window will open.
Narmad river is flowing in zone III region so select zone III
Then select response reduction factor as steel building with ordinary moment resistance.
And Important factor as All other building.
(The structure which we created is not important structure it is only use for pipe carying so select IF as all other building).
Then click on generate button and add self weight also.
After that select load case detail in load and difination window then click on add option .
Create Load cases in all the direction (i.e X, Y , Z global)
Select load case of X direction and click on add option then this window will open.
In this window go to seismic load and select X direction and then click on add.
Repeat this procedure in all the directiion individual Y & Z direction.
Next is to define load combination for that structure.
For that again select load case detail and click on add option then this window will open.
In this window first go to define combination option then put the value in that
Consider Factor 1 for X direction and 0.3 for other direction.
Repeat this same procedure for different direction to define load combination.

Step (12) :- Applying pipe load on Structure.

First we need to create the beam for pipe.
For that select all end node of Z direction which is parallel to X direction.
Then copy them in - Z direction upto 1 meter by using translation repeat option.
Again select copied node and again copy them in -Z direction uoto 0.64 meter.
Connect all the node using add beam option for making beam.
After that select both the beam and assign this ISMB 300 property to it (Assumption)
Now Assigning pipe load on the beam.
Fo that go to loading in right side load and difination window select load case and click on add option.
Then create load case for 700 mm dia pipe.
Again create another load case for 200 mm dia pipe.
After that select load case for 700 mm pipe and click on add then this window will open.
In this Window select member load put UDl value 7.18 Kn/m for 700 mm dia pipe as we calclated manually above and click on add.
Then Select the First beam we created earlier and assign this load on it
Repeat this same procedure for 200 mm dia pipe and UDL value is 0.331 kn/m manually calculated above and assign this load to second beam.
Hence, All load is assigned

Step (13) :- Analysis of Model

After Applying load to the structure go to analysis and design option and click on run analysis.
Then analysis process will start.
After analysis process is done then click on postprocessing mode to view the result.