Seeking help with seismic and time-history analysis in stress analysis
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Recently, I encountered a pipe between a compressor and a buffer tank for which it was necessary to carry out seismic and time-history analyses. I’m not very familiar with this process; could anyone with experience offer some guidance? Are there any relevant materials available? 1. How is seismic analysis carried out in CAESAR? How are the coefficients determined, and how are they entered? 2. The operation in the pipeline is intermittent: the valve is opened when gas is needed, and the flow rate increases from 0 to a certain value; after use, it decreases from that value back to 0. However, this operation does not occur very frequently. I’m not sure whether such operating conditions require time-history analysis, and if so, how should that analysis be carried out?
Earthquake analysis is definitely not needed. This pipeline is mainly subject to vibration. It is a bit difficult to create a time history for compressor pipes using Caesar; of course, if the piping system is relatively simple, it can be done then as well. The common approach is to use harmonics for analysis. First acoustic analysis, then mechanical analysis.