Developing Steel Stoplog to hold back water forces
Developing Steel Stoplog to hold back water forces
(OP)
My goal is to develop 12 7ft stoplogs that can be stacked (3 per bay for a max height of 21ft) and will be fabricated to stop the water from flowing into the levee pipes. The bay is 9.5ft, with stoplog channel, I have steel stop logs with a width of 122in.
I have already determined the force of water to be 1.3 k-ft. The steel face plate will be 1/4" thick, with 6"x5" HSS bracing every 21" OC (weak axis). I am now at the point where I need to determine how the load will be transferred from the plate and bracing, to the channel. I am looking to use an L beam which will be welded to the bracing and will push up against the channel, supporting the force of water.
How do I calculate the load from this support? I guess what I'm trying to ask is, how do I go about sizing which L beam I need from this setup? I'm using the AISC Steel Manual so feel free to reference that.
See attachment for rough drawing
I have already determined the force of water to be 1.3 k-ft. The steel face plate will be 1/4" thick, with 6"x5" HSS bracing every 21" OC (weak axis). I am now at the point where I need to determine how the load will be transferred from the plate and bracing, to the channel. I am looking to use an L beam which will be welded to the bracing and will push up against the channel, supporting the force of water.
How do I calculate the load from this support? I guess what I'm trying to ask is, how do I go about sizing which L beam I need from this setup? I'm using the AISC Steel Manual so feel free to reference that.
See attachment for rough drawing






RE: Developing Steel Stoplog to hold back water forces
But if you have a reason to design the stop log that way, it's just compression on a plate. Do a kl/r on the plate and be conservative. It is a variable load, so if you design the bottom 12 inches, it's conservative for the rest of it.
Stop logs see very large loads. Be conservative and be sure to pay attention to the load path. I'd armor plate the groove, too. Bearing on the concrete might cause problems.
RE: Developing Steel Stoplog to hold back water forces
And the reason there's another member in the design is because of the water. The L beams on each side would solidify the gate as well as make it easier to install a rubber seal along this beam to keep the water out (to an extent). Installing the rubber seal on the back will ensure that the force of water is helping me create s tighter seal.
RE: Developing Steel Stoplog to hold back water forces
RE: Developing Steel Stoplog to hold back water forces
RE: Developing Steel Stoplog to hold back water forces
Since the bracing will be welded on the L beam, it will be handling the shear forces of the HSS. I'm basically just going to pick a reasonable sized L beam and check for buckling. What would be the best way to check for buckling from a load being applied like this (see attachment)?
RE: Developing Steel Stoplog to hold back water forces
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RE: Developing Steel Stoplog to hold back water forces
RE: Developing Steel Stoplog to hold back water forces
RE: Developing Steel Stoplog to hold back water forces