Load and Resistance Factor Design Calibration to Determine a Resistance Factor for the Modification of the Kansas Department of Transportation-Engineering News Record Formula, Technical Summary.

摘要

KDOT has used the Pile Driving Analyzer (PDA) in the field since 1986 for at least 246 pile-driving operations. It was consistently noted that the PDA- and CAPWAP-predicted capacity was significantly greater than KDOT-ENR-predicted capacity. Therefore, the objective of this analysis was to compare available KDOT-ENR data to PDA and CAPWAP data in order to arrive at a revised version of the KDOT-ENR formula. If the current KDOT-ENR formula consistently under-predicts pile capacity in the field, piles are being driven to a capacity that is overly conservative. By applying a calibrated factor to the existing formula, piles will be credited with reaching the design resistance at shallower depths, resulting in savings on materials and labor.