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Pressure Exerted on a weldment
Ameer Chilakala Dec 15, 2007 3:48 AM (in response to Benjamin Reilly)We can apply force per unit length on beam section in 2008, during applying the load we have to select the entire beam section. During solving beam analysis they will mostly force per unit length. Kindly go through the cosmosworks 2008 online tutorial, which consists of beam analysis example.
Pressure Exerted on a weldment
Benjamin Reilly Dec 17, 2007 5:59 PM (in response to Ameer Chilakala)Thank you for your response. I did find the "per unit length" box, didn't look hard enough before. I reran the analysis this way: I took the PSF pressure and multiplied it by the area of the door. Then I took the resulting force in LBS and divided it by the total length of tubing or beams. I then entered this number into the forces box. The model is simplified (no hinges or framed opening) and we only are looking for preliminary type results. It is, however, an assembly of 2 pieces, top and bottom. The problem I have now, is the stresses are 23 times the expected stresses. I'm sure that what I'm doing wrong is simple, but I don't see it right now. I believe part of it is related to the two middle beams being so close together, but this is how the assembly is. Should I just drop one of the middle members?
DoorCosmos Model.JPG 218.4 KB

DoorCosmos Model Results.JPG 256.9 KB

Pressure Exerted on a weldment
Benjamin Reilly Dec 17, 2007 8:16 PM (in response to Benjamin Reilly)I think I solved my own problem. First, I needed to make the pinball for calculating the joints big enough to absorb both center members together. Next, I needed to do my own wind pressure calcs... a coworker suggested that 90MPH was 33 PSF, instead of 21 PSF. Now my results look better, although there is still an anomaly in one of the trusses, probably joint related.

