I performed a dropped object analysis for object mass 0.41 mT falling from a height of 5 m height which is equivalent to energy 20 kJ. SACS energy graph shows 17.9 kJ energy was absorbed by the structure during drop object impact process.
The question then arises where is the reminder 2.1 kJ has gone?
2.1 kJ is a energy leakage due to plasticization of members in the structural model?
What does SACS collapse module considers to arrive at net energy calculations in non-linear dynamic analysis?
Please clarify.
Grating_DRP_2.zip
Regards
Srikanth Vasa
Sr. Structural Engineer