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Koot, thanks for the reply. I completely agree that if ice is present, treat the perforated panel as closed and used concurrent ice wind withour open area reduction.

brut3, we have used the IPA numbers for years and agree that it is good documentation to build your judgement on. We can all agree that perforated panels take substantial judgment to design and are typically allowed to have a reduction in pressure. However, to get back on track to the main...

SteelPE, great suggestion except Dri Design would contact their engineer, which is someone like me ;)

Jed, in my field of work, a 10-20psf difference can make a large impact to what is adequate or failing. I would agree, that if you are not too concerned with the slight increase in pressure, be conservative and treat as a solid plate. JAE, I completely agree and this is the main point to the...

SteelPE, thanks for the reply. Not a roof screen, that would be a completely different loading. My typical condition is cladding installed over subgirt tube/zee framing on the wall. Its simply aesthetic. Most of these panels are 3-4' tall by 4-6' wide lapped together or have some form of 1/2"...

I'm looking for suggestions on the "correct" wind pressure to apply to perforated aluminum panels acting as cladding. In particular, the panels that are installed at corners of a building or even wrap around a building. Does anyone have technical documents or case studies that prove effects of...

I am a design engineer completing work from the USA for Qatar. Does anyone know where I can get excerpts from the QCS 2010 in regards to wind velocity and other structural code criteria? In particular this would be for components and cladding. Any information regarding wind pressure development...

Thanks rb for reply. I was in search of formulas without integration. I have since located formulas that return what I need. Anyone in need of formulas like this should check out "Handbook of Equations for Mass and Area Properties of Various Geometric Shapes" compiled by Jack Myers - 1962. The...

I am in search of basic formulas for determining the strong moment of inertia of an arc. I know the equatin for weak and know the integral method to determine the strong. I need a quick formula. For example, an arc of radius 14inches and thickness of 1/8" (cross section of half a pipe). The...

Does anyone know where I can locate a table of the different tensile strengths for different wire diameters? Specifically these wires are used in solid extension coil springs and range typically from 6mm to 12mm in wire diameter (1200MPa for 10mm 1.4310). Also, the material is rust-proof 1.4310...

Exactly what I was looking for. This is perfect Israel. Thank you so much.

Thanks for the replies. Shear stress is calculated based on equations similar to: http://www.efunda.com/DesignStandards/springs/spring_extension.cfm I should have noted my spring material is stainless steel. Typical sizes are 48mm nominal diameter with 9mm 1.431 V2a wire. Total length typically...

I am a design engineer designing extension (tension) springs. Does anyone have technical documents or suggestions on what to use for allowable shear strength for springs? I have seen people use 0.4 times the tensile strength (normally Rm), 0.45 times Rm, and also 0.75 times Rm. These seem like...