I-Beam Load Limit

The lightest 100mm I Beam I can find is S100x11. It has a flange width of 68mm, a mean flange thickness of 7.4mm and a web thickness of 4.9mm. For a span of 2m, a Grade 50 beam has a factored moment resistance of 18.3 kn-m which means it has a failure load of 36.6 kN or about 8,200# applied vertically at the center of the beam.

Using a load factor of 4, this beam could carry 2,000# safely.

Your beam has a narrower flange width, an unknown flange thickness and an unknown yield point. The cost of a new beam with known properties is a mere pittance compared to the cost of collapse, so why not buy a new beam and be done with it?

Thanks ba-el.

The web on my beam is 6.5mm.

Our problem is that the rig must be easily manually portable and so kept as light as possible.

chas

You must decide on the maximum load you are going to lift. Then you can select the lightest beam possible to safely sustain that load. My recommendation is to buy the lightest beam consistent with the capacity of your hoist. To use an existing beam with unknown properties is false economy (my opinion).

I assume this is a simply supported beam, not fixed at the ends. Don't forget to include the weight of the trolley and hoist with your working load.

for a span of 2m, carrying a point load calculated at PL/4, I can't imagine even a pre-A36 mild steel beam of the dimensions you indicate having any failure event. Deflection may be another issue, but even deflection shouldn't present you with iminent failure. I'm more worried about this tripod support arrangement, potential rotation of the beam under load and collapse of everything (except the beam).

Another approach is to load test the existing beam and tripods in a safe location where there would be no damage if the beam fails. Then, applying an appropriate load factor, you would have confidence that the beam would perform adequately in any location.

my friend

to carry anything you need to have some pully and wire or chain as according to your mentioned weight you may need 3-4 pully fix every two on the same access and fix the wire first end to the rod beside the upper pully then around the lower one and take it to the around the second upper one and around the second lower one you may be able to carry that load by your pair hands if not increase another pully on the two access " upper and lower " it is the same idea the cranes work , of course it has some calculation to estimate the type of the pully and its dimention and the distance beteen the upper and the lower rod carrying the upper and lower pullyes but the 350 kg is too low and that may help you

thanks

tamer agha