Chance Technical Design Manual

SYMBOLS & ACRONYMS

ksi

Kips (kilo-pounds) per square inch

Q ULT

Ultimate Capacity of the Soil Resistance or Resistivity

K t

Empirical Torque Factor

R

L L

Pin spacing

RF Resisting Force Rh MAX Maximum Installation Force Based on Ultimate Capacity of Hardware Rh ULT Ultimate Hardware Installation Force R meter Resistivity Indication from Nillson Resistivity Meter R p Installation Force to Achieve Proof Load RQD Rock Quality Desigination RR Round Rod RS Round Shaft R w ULT Ultimate Hardware Strength based on Structural Weight S Degree of Saturation (Section 2 only) S Average Friction Resistance on Pile Surface Area (Section 5 only) SBCCI Southern Building Code Congress International S K Snow Load Factor SL Snow Load SL Shrinkage Limit (Section 2 only) SL Service Life (Appendix A only) SLF Street Light Foundation SPT Standard Penetration Test SS Square Shaft SS Split Spoon (Section 2 only) SSCF Soil Screw® Anchor Component Force S t Soil Sensitivity ST Shelby Tube s u Undrained Shear Strength T Tension Load (Section 4 only) T Average Installation Torque (Section 6 only) T Indicated Force (Section 9 only) T/C Tension/Compression T FN Critical Helical Anchor Head Load u Pore Water Pressure UC Unconfined Compression Test U cr Dimensionless Ratio USCS Unified Soil Classification System V Volume (Section 2 only) V Voltage (Appendix A only) V N Punching Shear Strength VST Vane Shear Test W Soil Load w n Moisture Content Ws Weight of Steel Pile WSF Wenner Spacing Factor WWF Welded Wire Fabric x Pier Spacing x MAX Maximum Pier Spacing y Lateral Deflection of Shaft at Point x

Foundation Shaft Length

L.I.

Liquidity Index Liquidity Index

LI

LL LL

Live Load

Liquid Limit (Section 2 only) L p MAX Maximum Free Span Between Piers L u Unsupported Length M Mass n Porosity N

Field Blowcount Value from Standard Penetration Test (SPT)

(N1) 6o Normalized SPT N-value NBS

National Bureau of Standards

N c

Bearing Capacity Factor for Cohesive Component of Soil

N q N γ

Bearing Capacity Factor

Bearing Capacity Factor for Soil Weight and Foundation Width Effective Friction Angle Between Soil & Pile Material

ø

OCR

Overconsolidation Ratio Line Load on Footing Active Earth Pressure Critical Buckling Load Critical Compression Load

P

P a

P cr

P crit P des

Design Load per Pier

pH

Acidity or Alkalinity of a Solution

PI

Plasticity Index

PIF

Power Installed Foundation Power Installed Screw Anchor Plastic Limit (Section 2 only) Proof Load (Section 6 only) Average Overburden Pressure

PISA

PL PL P o P p psf PT P w

Passive Earth Pressure

ppm

Parts per Million

Pounds per Square Foot

Test Pressure

Pier Working Load

q

Effective Vertical Stress on Element

Q q’

Axial Compressive Load

Effective Overburden Pressure

Q act Actual Capacity Q act /Q calc Capacity Ratio Q calc

Calculated Capacity

Q h Q s Q t q u

Individual Helix Capacity Capacity Upper Limit

Total Ultimate Multi-Helix Anchor/Pile Capacity

Unconfined Compressive Strength

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