Lpile Input Parameters

Inputs for Lpile Program

Round Pile Sections Diameter (in) 18 24 30 36 42 48

Moment of Inertia (in^4) 5153 16286 39761 82448 152745 260577

Modulus of Elasticity Concrete f'c (psi) 3,000 3,500 4,000 4,500 5,000

Area (in^2) 254 452 707 1018 1385 1810 Equation = 57,000*f'c^0.5 Modulus 3,122,019 3,372,165 3,604,997 3,823,676 4,030,509

Data-Boundary Conditions 1) Shear and Moment Use for Free Head Conditions, Pile wall as an example) 2)

Shear and Slope (Use for Fixed Head Conditions when slope = 0

3)

Shear and Rotational Stiffness May also be used for Fixed Head condition if a large rotational stiffness is applied Used for elastically-restrained pile-head connection

4)

Displacement and Moment Not commonly used in our work

5)

Displacement and Slope Retaining wall on top or toe of slope condition

Soil Type Since most of our work is with cohesive soil, use the silt Option (Phi-C Soil) The other parameters you will need are: Soil Parameters From Table 3.3 in Lpile Users Manual Clays Cohesion (C, Unconfined Consistency SPT Blow count, Ave Undrained Shear Strength lbs/ft^2) where Compression Max (N60, Max (Cu, lbs/ft^2) C= 0.5*qu Strength (qu, blows/ft) ref. lbs.ft^2) NAVFAC 7.01 Very Soft 250 260 2 520 Soft 4 500 520 1040 Medium 8 1000 1040 2090 Stiff 15 2000 2100 4180 Very Stiff 30 4000 4200 8350 Hard >30 8000 * 16700

Soil Modulus, K, Static (lbs/in^3)

30 100 500 1000 2000

Soil Modulus Strain, e 50 K, Cyclic ref. Table (lbs/in^3) 3.4 and 3.5 Lpile users * * 200 400 800

0.02 0.01 0.006 0.005 0.004

Sands

Very Loose Loose Medium Dense Very Dense

Max SPT (N'70) ref. Bowles, 1988 3 7 20 40 >40

Strain Value of strain at 50% of maximum stress, Value from Consol Curve Plate

Above WT

Submerg ed Not needed

25 90 225

20 60 125