K1 and K2 for determining bearing length Y for base plate

Posted by: Win

K1 and K2 for determining bearing length Y for base plate - 02/01/10 03:51 AM

Dear to whom it may concerned,

Please refer to the attched PVElite calculation. The values of K1 , K2 and hence Y seem to be inccorect that lead to high thickness for the base plate.

Please clarify.

Winson Lim
Posted by: Luis Sanjuan

Re: K1 and K2 for determining bearing length Y for base plate - 02/04/10 01:54 PM

Hi Winson,

The latest version of PV ELite 2010 uses another formula for the moment arm for the baseplate. Install PV Elite 2010 to see this calculation.
Quote:
Baseplate Thickness Calculation per D. Moss:

Bearing Pressure (fc)
= 2 * (QO + Tforce) / (Y * Bplen)
= 2 * (25166.08 + 791.98 ) / (1332.06 * 2316.48 )
= 0.02 MPa

Distance from Baseplate Edge to the Web [ADIST]:
= (Bplen - Weblngth) / 2
= (2316.48 - 2265.68 ) / 2
= 25.4000 mm

Overturning Moment due To Bolt Tension [Mt]:
= Tforce * Adist
= 791.98 * 25.40
= 20124.53 N-mm

We have also corrected the values which were not shown correctly in metric units in the report. The corrections will be seen on the next PV Elite 2010 Build.

I have attached a sample of the calculations for the Bolt Area calculation and the Baseplate Thickness Calculation per D. Moss for you to see.