Learning Forum

[Harry Finch]

Hi there,

I am currently trying to model a 2D cross section (set to 3D as 2D mechanical doesnt like to model as beam elements!) of the twin towers in ANSYS mechanical. I have spent a crazy amount of time trying to get this to produce results anywhere near that which I expect, with no success. The aim is to produce a model which doesnt fail at 10% completion, and produces transient results. I have attatched some images below and would be very grateful for any help I can get. Some key details:

• The model is a transient thermal-structural study using line elements (with model type set to beams) with accurate cross sections applied.
• I think the issue lies within the connections: when using a penalty based formulation, the model fails up to around 10-11% everytime no matter what I do, and the connections appear to split from each other just before failure. When I use a non-penalty based formulation (i.e beams or MPC) the transient study produces static results (shown below), and runs indefinately.
• The temperature input increases linearly (tabular data), I have tried many different max temperatures, none of which work. The transient structural and thermal analysis settings are shown below.

 

[Ashish Khemka]

Hi Harry,

 

Can you try applying load for just one step and increasing the number of substeps for one step and then see if the transient effects are getting captured or not? Also, please turn on the large deflections.

 

Regards,

Ashish Khemka