ASD Side Resistance for Drilled Shaft Rock Socket

[jdonville]

The formula given in Article 4.6.5.3.1 of AASHTO HB-17 (page 85) for ultimate side resistance reads as follows:

Qsr = (pi)*Br*Dr*(0.144*qsr)

Yet the label on the y-axis for Figure 4.6.5.3.1A indicates that qsr is the unit side resistance.

Should the formula read:

Qsr = (pi)*Br*Dr*(144*qsr)

to make the units work out?! Or do they intend to reduce Qsr by a factor of 10 for some reason?!

All responses welcome.

Jeff


Jeffrey T. Donville, PE
TTL Associates, Inc.

http://www.ttlassoc.com

 

[jdonville]

Sorry, reduction should be 1000 - not 10.

Jeff

 

[jdonville]

The question was answered in the Foundation Engineering forum. Qsr is defined in kips, therefore 0.144 is correct.

Jeff


Jeffrey T. Donville, PE
TTL Associates, Inc.

http://www.ttlassoc.com