Dynamic (Time History) output report generates the following 2 Nos. of (OCC) COM# 1 type Load cases.

Load Cases are:
CASE 1) (OCC) COM#1 Max resp.
CASE 2) (OCC) COM#1 1000 msec

We need to know the maximum dynamic forces and moments at restraints (Pipe supports).

It has been observed that the above Load Case no. 2 (1000 msec) is generated by CAESAR-II irrespective of the relief time cycle, i.e. even if the complete cycle is either from 0 msec - 2000 msec or from 0 msec - 900 msec.

Query 1) (OCC) COM#1 1000 msec is it a default simulation (Load case) by CAESAR-II ?
- Probably answered as YES above just a confirmation from all readers.

Query 2) Dynamic forces & moments on restraints in above mentioned CASE 2 is less conservative as compared to CASE 1. So what is the purpose of obtaining (OCC) COM#1 1000 msec restraint report ?

Query 3) In order to obtain max. dynamic forces & moments which load case report has to be selected out of the two cases ?

Query 4) Even if the total relief cycle is 900 msec, the restraint report with (OCC) COM# 1Max. resp. gives higher loads at a particular msec compared to (OCC) COM#1 1000 msec. Please clarify?

Regards

Sandeep

Query 1) No, 1000 msec is not a default. In the dynamic input, on the Control Parameters tab, there is an option for the "Number of Time History Load Cases". This entry is actually the number of snap shots you want of the simulation. For each snap shot there will be a complete set of reports (displacements, forces, restraint loads, and stresses). Typically, you want only the maximum results, so these snap shots are not usually reviewed. Most people just request 1 load case, adn the time is the ending time of the simulation. If you have something else going on, please e-mail me the following files so I can determine what the problem is: (_A, _J, _7)

Query 2) True. The results from any of the snap shot cases will usually be less than the Max case. This Max case reports the maximum response during the entire simulation. Usually, this is the only case you need to review, unless you're particularly interested in something at a particular time step.

Query 3) Use the Max case.

Query 4) Yes this makes sense considering items 1 and 2 above. The only issue I question is your time of 1000 msec. If your duration was only 900, I don't see how the output could report anything at 1000. I'd really like to see your input files. Send them to ray@coade.com.