topic Re: Moving load on truss in Robot Structural Analysis Forum

Moving load on truss

basheer.algohi — Sun, 24 Jan 2021 01:14:42 GMT

Hi,

I am trying to understand how does moving load works on the truss.

I tried to create a truss and apply a moving load but the moving load was not available as an option.

I created a frame (similar to a truss) and released all members as can be seen in picture No. 1.

I defined the moving load path on the bottom chord and perform the analysis but the result is not as it should be.

I move the loaded path down the truss and another weird result happens.

Can anyone help with this issue?

As far as I understand, when the load moves on the bottom chord the bending moment should be only on the bottom cored not any other members.

Thank you

Rafacascudo — Sun, 24 Jan 2021 12:38:35 GMT

Zip and attach the model

Simau — Sun, 24 Jan 2021 13:09:22 GMT

Delete releases on top and botton chords, and try with a single nodal load, and look if the bending moment shape is correct;

basheer.algohi — Sun, 24 Jan 2021 18:30:28 GMT

Zip file is attached

basheer.algohi — Sun, 24 Jan 2021 19:00:36 GMT

How did you do that?

I did as you said but the result still not correct:

Simau — Sun, 24 Jan 2021 21:09:15 GMT

Your moving loads are applied to the whole structure instead of lower chord.

When you define the route don't select "automatic"

Model attached

basheer.algohi — Mon, 25 Jan 2021 09:04:53 GMT

Thanks a lot.

That was very helpful.

basheer.algohi — Mon, 25 Jan 2021 10:18:41 GMT

Thanks a lot.

That was very helpful.