For the first part, I'd use CNODE anchors as Richard suggests, and set stiffness to 0.

If I were responsible for lashing details - and I'd validate I were before I went down that path - I would run a modal analysis to determine where natural frequencies exceed a set value - let's say 15Hz, but understand that's a number pulled from thin air - and choose "support" points to negate those frequencies.

If you want to calculate stresses due to the lashing, then that's a matter of figuring out where your lash points on the pipe and the lash points on the transport are, determining/defining the tension in the lines, and then summing those 2 vectors and applying it to the pipe.