It is however worth mentioning here that by following this process you are able to account for the compression only springs when it comes to load combinations involving non-Response Spectrum load cases (like DL + LL, DL +/-WL, DL + LL +/-WL etc. Once all REPEAT LOADs and LOAD COMBINATIONs ( for response spectrum combos only ) are defined, follow it up with another PERFORM ANALYSIS and CHANGE. Subsequently re-define the support springs with compression only attribute followed by REPEAT LOADs to combine the primary cases. For combining the response spectrum cases with other loads, you still have to use LOAD COMBINATION. Use PERFORM ANALYSIS and CHANGE after that. However here are a couple of suggestions which may helpįirst option is to define the support springs without compression only attribute to analyze the response spectrum cases and other primary cases ( live load, equipment load etc.). Response Spectrum loading, due to it's very nature, does not lend itself to any iterative type analysis ( Tension/compression, Pdelta etc.). So the answer to the question is, response spectrum loading cannot be used in conjunction with compression only springs. I also need to define compression only springs to simulate soil support. How can I do this ? I am doing an analysis with response spectrum loads.
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