How can I know if my structure is failing after applying a temperature load?

[Anonymous]

Hello,

I have a simple s275 steel truss bridge that I am applying a temperature load of 1000 degrees Celsius upon all over the entire bridge to simulate a wildfire engulfing a bridge.

I have already set up basic a live load (traffic etc) and dead load (self weight of the bridge) alongside the temperature load and I have reviewed the maximum deformation and maximum stress, but I am unsure if the structure is failing or not as there is no indicator or animation which tells me if there is critical failure,

another point of concern is how would I go about making the structure withstand the heat (without failing) longer, over a given time.

I assume by changing the steel material and making the sections larger would help but is there anything else I can do to make the structure more resistant to fire?

 <- The loads

 <- Deformation with all three loads enabled (live, dead, temp)

 <- Stresses with all three loads enabled (live, dead, temp)

Thank you for the help, I am not well versed with the program so if instructions or explanations could be in layman's terms that would very much appreciated.

[Krzysztof_Wasik · Accepted solution]

Hi @Anonymous 

I see that you are using BS-EN steel code.

In EN codes Fire analysis is supported while steel design.

You have to

- activate Fire analysis in Steel member type.

- define member parameters for fire analysis (temperature curve , protection type)

- assign those parameters to steel members.

- define load cases for fire verification (usually accidental combinations)

Then after model calculation in Steel design module

- Open Configuration in Calculations Dialog

- Activate Fire verification (select method and code)

- Run steel verification for selected members and load cases.

Refer to this video and Robot Help

- in configuration activate fire verification

- define fire parameters and if necessary protection type used for sections. 

There are some Robot forum topics which might be helpful as well for instance this one

[Anonymous]

Thank you!