I would love help if anyone is able to offer any. I need to make a ramp to move equipment down a 3.5’ retaining wall. The ramp is to be 12’ long. I was going to use two 6” x 6” beams of Douglas fir, bolted together using 3/4” all thread. I don’t know how to calculate this.
Question, will a 5.5” deep by 11” wide by 13’ long ramp of Douglas fur support a piece of machinery that weighs 4300 pounds
Track length on the equipment is about 4.5‘.
Thank you so much for your help and time.