Difference between zero tension and linear analysis type in RAM Concept

RE: Difference between zero tension and linear analysis type in RAM Concept

Seth Guthrie — Mon, 23 May 2022 23:26:59 GMT

If you don't have any area springs, then there is no need to make the combinations zero-tension.

If you are asking what's the difference between two single combinations and a lateral group combination, then the answer is in the amount of results available. With individual combinations you can look at the standard results, say bending moments for a specific combination. With a lateral group the program saves the envelope of results only. Check these sections of the manual for more: "11.6 About group load combinations", "11.8 Summary of load combination types", and also "33.2.2 Max and Min context slab plot limitations"

RE: Difference between zero tension and linear analysis type in RAM Concept

Brad Geyer — Mon, 23 May 2022 23:17:15 GMT

Seth,

To follow up on Karthik's question - if you have an elevated slab and no area springs, what is the difference between using two zero-tension load combinations (ex: D+0.7E, D-0.7E) versus using a single Linear analysis load combination with +0.7/-0.7 Loading Factors?

RE: Difference between zero tension and linear analysis type in RAM Concept

Seth Guthrie — Thu, 02 Aug 2018 21:53:05 GMT

If you have area springs then you need to run an iterative no-tension analysis to insure all the springs are in compression. Otherwise, with a linear analysis, some of the springs could be in compression while others are in tension.