Shear Capacity Adjustment Factor, Co

[medeek]

I've been recently incorporating some perforated shearwalls into some of designs and feel that I have decent understanding of the provisions found in the SDPWS-2008. However, I thought I might use equations 4.3-5 and 4.3-6 (Sugiyama's eqn.) to compute the adjustment factor (Co) instead of having to double interpolate table 4.3.3.5. I am finding that my computed value is always slightly greater than the tabulated value, perhaps I am somehow calculating this incorrectly. I was wondering if anyone else has ran into this same issue or noticed anything similar?

A confused student is a good student.

 

[medeek]

As a side note I've decided to try and create a perforated shearwall calculator since I could not find anything online to my liking. This will be above and beyond my usual spreadsheet calculators so it might take a while to piece together. I'm currently working only on the interface, you can try it here, it is still a bit of a kludge and it works best right now with Google Chrome or Mozilla Firefox, Internet Explorer seems to have some issues with the SVG rendering:

http://design.medeek.com/resources/shearwall/perfshearwall_calculator.pl

It doesn't actually calculate anything yet but I think the basic interface is slowly emerging. Let me know what you think and also what features or improvements would make the interface better and easier to use.

I plan on calculating Co using the equations in the SDPWS which will mean that my values will not be as conservative if someone were to use table 4.3.3.5.

A confused student is a good student.

 

[RFreund]

The tables assume the opening is full height, so there Ao is larger (I believe). I think there is some information in the commentary on this.

EIT

http://www.HowToEngineer.com

 

[RFreund]

What I said was misleading. However read the commentary on page 69 of the 2008 wind and Seismic (section C4.3.3.5). I remember have a similar finding as you.

EIT

http://www.HowToEngineer.com