I have a question on how to model U-bolts in Autopipe. If the U-bolts holding a pipe are not clamped down tight to the pipe I have been modelling them as a guide. If the U-bolts are clamped tight can anyone tell me the proper way to model these supports? What friction factor should I use? Thank you!


  • You can apply a concentrated force of 10KN at the support to simulate the u-bolt tension pre-load. Apply the load under GR case as it will be there all the time. Based on the friction factor, the friction force can be calculated as mu*10KN. Make sure the support stiffness is rigid, otherwise there can be excessive deflections and stresses due to this force at the support.

    This approach is limited to rigid supports.