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What about just reinforcing what you have? Do you think something like this would be acceptable visually?

I see. Certainly a bolt would assist in keeping the "plies" together but I am not sure that it would keep it from splitting in the first place. This is a very interesting concept. Do you have real world examples on this? If you were to set up a test with a two simply supported beams. One...

Are you saying that by drilling holes perpendicular to the neutral axis and putting bolt through it, you are in turn reducing the stress? I know a hole is a good way to mitigate crack propagation but I am unsure if that would work for wood, and to what end? Assuming you were planning to use a...

Are these forces due to D+L or is it wind? Any shot at making your floor joists deeper to reduce the moment at the column? What sections are you using on the knee braces? I would think putting a bolt through the column would do nothing since a bolt is not continuous.

Due to symmmetry, I would consider your beam fixed at the two load points....then apply 2,500 lbs upwards to each of your welded hooks. Easy?

While this can work (depending on loading) what is the goal? Is that a hand wheel? What scale are we talking about? I have the same question as rb1957, what is driving what.

I usually provide v-belt "tension" by way of adjusting centers using screw take-ups. What are you using as a tensioning device?

TracyChen, I believe you only need a 3/4" diameter bar per code. Reducing the diameter would definitely help reduce deformation at bending. I've seen 3/4" weldable re-bar used quite often. Is the downward bend to prevent feet from slipping off?

I've used both the frame simulation and brick simulations. I have not put it through it's full paces yet though. What are you looking to use it for?