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Considering taking on this work. Interested to hear feedback. Thanks.

Any tips on strengthening 2x8 roof rafters? Collar ties currently exist on every 4th rafter. I'm thinking that adding collar ties at every rafter could easily increase capacity. Any tips? Suggestions? Warnings? Cautions? Thanks in advance.

Thanks motorcity! Good ideas.

I have a solar contractor client who wants to attach their PV panels to the masonry parapet of a row house through a system in which ultimately the wind uplift load is applied to the parapet by way of threaded rods which are drilled horizontally through the parapet. The height of the parapet...

Client wants to add solar panels to the roof (very lightweight ~3PSF) but I still need to verify the capacity of the existing roof trusses.

Yes pieces do seem to possibly the assembled on site. Have you ever seen metal connection plates like that before? They seem to have numerous daggers built in to them that then were hammered or otherwise driven into the wood members. The metal connection plates occur on both sides of each truss...

Another photohttp://files.engineering.com/getfile.aspx?folder=bf110667-676c-4b8b-a893-5dd37c3e18d5&file=image.jpeg

Another photohttp://files.engineering.com/getfile.aspx?folder=28a7fbc6-7c9e-4893-b428-db477e3e7667&file=image.jpeg

I'm doing some work on an existing building with timber roof trusses. I have never seen a truss with this configuration or these types of connections before. (See attached photos.) Has anyone seen these before...

Thank you edstainless!

Great ideas, everyone. Thank you. Welding the plow bolts to the bottom plate is a clever idea. Are plow bolts weldable? I have not used them before. I suppose we would need to use some type of cover to hide the nuts at the top to prevent someone from removing them. Any suggestions on what to...

Canwesteng, that is a thought. The artist was envisioning a flat base but something more along the lines of a pedestal may be acceptable. Thanks!

Further brainstorming- If base itself is aluminum, I won't have to deal with dissimilar metals and galvanic corrosion. Plus aluminum is lighter weight. It'll need to be bigger and thicker to counteract overturning and sliding, but larger footprint is acceptable and thicker base will make...

After I wrote the above posted description and questions, some additional ideas occurred to me- Is there any reason structurally why this 800 lbs base couldn't be 2 separate 400 lbs pieces? The sculpture is only 1/2in thick, so it's really only taking wind in one direction. Would I want the...

I am designing a base for a 6ft tall x 5ft wide x 1/2in thick sculpture that is to be located outside in a plaza for 1 year. The artist prefers to use aluminum for the sculpture itself, but is open to using stainless steel if it's preferable structurally. We are not allowed to attach the...

Very helpful. Thank you all!

Thanks, tolchijb! What about applying other finishes to the bolts or other pieces to further reduce corrosion, e.g. powder coating, teflon coating, silver plating, ???

I am designing a base for a sculpture. The artist would prefer that the base be stainless steel, the sculpture be aluminum, the connecting plate (between the sculpture and the base) be aluminum, and the bolts (between the connecting plate and the base be stainless steel. This is a temporary...

Found it! Thank you, SW13!!

Thank you all for your help. I got a copy of the aluminum design manual and I'm working through the design. One quick question – where can I find the value of the constant Kt? This is for the tensile rupture limit state of the member's elements in section F.8. I seem to recall that it's just...