[Abaqus new user]

To model Column Beam Flush Endplate connection in Fire in Abaqus , what step and element type should be chosen? My reference model only mentioned to use C3D8R element. I have used Loading step (Static-General) and Fire Step ( Coupled- temp displacement (transient)). But it doesn't show output for C3D8R element in Coupled-temp displacement step.
1. What step should be chosen if C3D8R element is chosen?
2. I tried using C3D8T for Coupled-temp displacement step, but facing "Time increment required is less than the minimum specified", I have tried increasing time increment and cutbacks but can't solve it. What to do?