what steps do we need to perform the fire analysis on the steel structure already subjected to earthquake in Abaqus?
The optimal approach involves utilizing the actual design parameters to determine material properties, followed by simulating the structure under earthquake conditions. The resulting damage can then be used as input for thermal analyses when conducting fire analysis on the steel structure in Abaqus.
This is where I am struggling. Can you please explain it bit more as how to input the data from the resulting damage ? Where do I need to put the deformation values while conducting thermal analysis?
To achieve this, conduct mechanical analyses and transfer the stresses from the ODB file to the same file used for thermal analyses under initial conditions. This process essentially couples the solvers.
You can achieve this by multi-step analysis. First, conduct the earthquake analysis in the first analysis step. In the next analysis step, perform fire analysis through the sequentially coupled analysis.
I performed the non linear time history dynamic explicit analysis to achieve the response of the steel structure but when I try to do the thermal analysis in the next step Abaqus only gives me the option of performing the dynamic temp disp explicit option. Can you please advise me on this ?
Nusrat Lateef Since you have already performed the non-linear time history dynamic explicit analyses, copy the same model without deleting the mesh inside it. Remove the existing step and, using the initial conditions, define a heat transfer analysis. In the initial stage, use the odb stresses from the previous step as initial stresses. Additionally, change the mesh library from Mechanical 3D Stress to Heat Transfer and set all other required parameters. Include temperature-dependent materials if needed.
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