Timeline for How to handle modal combination in response spectrum analysis for member forces for member with more than 1 element?
Current License: CC BY-SA 3.0
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| Oct 31, 2016 at 23:20 | comment | added | Graviton | "individual mode response" can mean the element displacement, or element force ( by multiplying the local stiffness with the displacement).. or anything. Say my beam has 5 elements, my understanding is that I will first obtain the element displacement for every mode, then obtain the element force for every mode, then I will get my member beam force for every mode ( by combining the elements together, and use average value at node at element joints for example), and then only use mode combination to obtain the total member beam force. Is that correct? | |
| Oct 31, 2016 at 17:17 | comment | added | CableStay | @Graviton I think I might have an easier time providing a clear answer if I knew what you're ultimately trying to calculate. When you say "individual mode response for each element" what do you mean? In my experience, when working in modal coordinates, you're dealing with the matrix for the entire structure, and solving the equation of motion for the entire structure. | |
| Oct 28, 2016 at 8:34 | comment | added | Graviton | I think your response is not clear with regards to my question: let's say I have a beam member with 5 elements. Do I 1) get the individual mode response for each element, get the individual mode response for the beam member, and combining the modes lastly, or do I 2) et the individual mode response for each element, combine the modes for each element, and only finally combine all of the element response into the beam member? | |
| Oct 20, 2016 at 18:14 | history | answered | CableStay | CC BY-SA 3.0 |