Moving loads in Strand7 1

[SuG89]

Hi,

In Midas Civil software there is an option of 'dynamic nodal loads' and 'arrival time' which allows for implementation of moving loads. Does anyone know which option can used in Strand 7 for the same? I did some research on this and it seems 'Load path' in Strand 7 can do this but I am not sure.

I have to apply the moving loads on a grid of beams (deck of a bridge) which are non-planar. Can the load path tool be used for non-planar surfaces?

Regards,
Su

 

[IDS]

Yes, the load path is what you need. If you have a current licence there are several web-notes on using load paths which are helpful.

You can certainly apply load paths to an inclined plane, I'm not sure about a non-planar surface, but the Strand7 support would know.

Which design code are you using?

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[IDS]

From the Load Path help:
"Load paths can be straight, circular or parabolic. All path shapes may be flat, but circular and parabolic paths may also be curved. A curved circular path could be used for an arched bridge, for example."



Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[SuG89]

Thanks for your quick response.

I am using NA to BS EN 1991-2:2003. Just realized that the load path command requires a license for the 'moving load' module which I don't have. Is there an alternative way of implementing moving loads in Strand7?

Regards,
Su

 

[IDS]

I can't think of a simple alternative.

You could set up a spreadsheet to generate beam loads for a specified vehicle position, then create a new loadcase for each position, and copy and paste the data, but the load path module would be a lot quicker and less error prone.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[SuG89]

Thanks once again. I'll go with the load path module.

Regards,
Su

 

[SuG89]

I'll have to do it manually without the moving load module.

Is there any option in Strand7 to have beams which do not add stiffness to the model (something like load patch command)? I want to create such a beam over the bridge deck structure and use it for load application. This beam will be linked to the bridge deck structural beams.

Regards,
Su

 

[Mohanlal0488]

@SuG89

If you do not have the moving load module for Strand7 and would like to do something similar, I would suggest using the linear transient dynamic solver which will allow you to vary loads according to a factor vs time table.

This would be an unnecessarily long task to do, as I am guessing you are going to require multiple tables and load cases. You could maybe find a way to simplify things though.

 

[IDS]

Is there any option in Strand7 to have beams which do not add stiffness to the model (something like load patch command)?

Well you could create a frame representing a vehicle, then connect it to the model with short vertical beam elements with translational and moment releases at one end, so only vertical loads were transmitted, but I'm not sure that it would be worth the effort.

In my opinion the easiest way would be to set up loads for one vehicle position manually (to get the right format for the loads table), then copy that (using the online editor) and paste into a spreadsheet, then generate the loads for different vehicle positions and copy and paste back into Strand7.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[SuG89]

Thanks to both of you for responding.

Regards,
Su