Calibration of region-specific gates pile driving formula for LRFD : final report 561.

Tavera, Eduardo A.; Burnworth, Gabriel H.; Rix, Glenn J.; Jung, Jongwon; GeoStellar Engineering, LLC; GeoSyntec Consultants; Louisiana State University (Baton Rouge, La.)

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Calibration of region-specific gates pile driving formula for LRFD : final report 561.

2016-05-01
By Tavera, Eduardo A. ; Burnworth, Gabriel H. ; Rix, Glenn J. ; ...

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Creators:

Tavera, Eduardo A. ; Burnworth, Gabriel H. ; Rix, Glenn J. ; Jung, Jongwon

Tavera, Eduardo A. ; Burnworth, Gabriel H. ; Rix, Glenn J. ; Jung, Jongwon Less -
Corporate Creators:

GeoStellar Engineering, LLC ; GeoSyntec Consultants ; Louisiana State University (Baton Rouge, La.)

GeoStellar Engineering, LLC ; GeoSyntec Consultants ; Louisiana State University (Baton Rouge, La.) Less -
Corporate Contributors:

Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration

Louisiana. Dept. of Transportation and Development ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

BOR Calibration EOID FHWA Modified Gates Implementation Load Tests LRFD Monte Carlo Method Pile Driving Pile Driving Formula Recommendations Regression Analysis Reliability Analysis
Publication/ Report Number:

FHWA/LA.16/561 ; LTRC Project Number: 14-1GT

FHWA/LA.16/561 ; LTRC Project Number: 14-1GT Less -
Resource Type:

Tech Report
Geographical Coverage:

United States ; Louisiana

United States ; Louisiana Less -
Edition:

Final Report, January 2014 - February 2016
Corporate Publisher:

Louisiana Transportation Research Center
Abstract:

This research project proposes new DOTD pile driving formulas for pile capacity verification using pile driving blow

counts obtained at either end-of-initial driving (EOID) or at the beginning-of-restrike (BOR). The pile driving

formulas were developed using a regional database containing 252 static load tests and 934 dynamic load tests (DLT)

collected from DOTD projects. The DLTs were conducted on blow counts taken at EOID (183 CAPWAPs) and BOR

(751 CAPWAPs). The pile driving formulas were developed by conducting a nonlinear regression analysis of the

generic Gates formula. The LRFD resistance factors (ɸ) were calibrated using the Monte Carlo Simulation (MCS)

method for the Strength I limit state with a reliability index (βT) of 2.33 as recommended for pile groups in AASHTO

specifications. The current LADOTD pile driving formula (FHWA Gates Formula) used to evaluate blow counts

taken at EOID was evaluated; results show a best fit ratio of 0.80 with a resistance factor of 0.67—higher than the

AASHTO specifications resistance factor (ɸ) of 0.40 for the same pile driving formula. The new EOID LADOTD

Modified pile driving formula has a best fit ratio 0.91 with a resistance factor of 0.59. This study recognizes pile

capacity setup can significantly affect pile driving formulas ability to predict pile capacity when using blow counts

obtained at BOR. Pile capacity setup was evaluated by computing the Skov-Denver pile setup factors (AQ) using total

pile capacity (Q). A minimum of two pile setup categories (A and B) were identified in Louisiana. Pile setup

category A is located in the coastal marshes along the gulf coast of Louisiana with setup factors (AQ) ranging from

0.135 to 0.428. Pile setup category B was assigned to the remainder of the state with AQ pile setup factors ranging

from 0.021 to 0.108. An evaluation of the pile setup curves using the Skov-Denver model indicates that more than

90% of the long-term pile capacity (load test conducted at t = 14 days) can be obtained at t ≥ 6 days for pile setup

category A and t ≥ 3 days for pile setup category B. A BOR pile driving formula was developed for setup category A

with restrikes conducted at t ≥ 1 days with a best fit ratio of 0.93 and a corresponding resistance factor (ɸ) of 0.64. A

different BOR pile driving formula was developed for pile setup category B with restrikes conducted at t ≥ 1 days

with a best fit ratio of 0.92 and a corresponding resistance factor (ɸ) of 0.605. Recommendations on the

implementation of these EOID and BOR pile driving formulas have been included in this study.
Format:

PDF
Funding:

State Project Number: SIO #30001424
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:76a7476f7779d85cc1e006cc3b3718c9646cf69e3b00cca9df044f04ed34a200
Download URL:

https://rosap.ntl.bts.gov/view/dot/30895/dot_30895_DS1.pdf
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Calibration of region-specific gates pile driving formula for LRFD : final report 561.

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