Embedded Data Collector (EDC) Phase II Load and Resistance Factor Design (LRFD).

摘要

A total of 16 static load test results was collected in Florida and Louisiana. New static load tests on five test piles in Florida (four of which were voided) were monitored with Embedded Data Collector (EDC) instrumentation and contributed to the total of 16. For the voided test piles, EDC instrumentation was placed in the piles at different locations relative to the void to compare the estimated resistances. In the four test piles, the measured top compressive stresses measured in the solid section of the pile were typically about 25% smaller than the measured values in the voided section of the pile. However, when the top stresses were adjusted by area (i.e., divide by 645 in2 / 900 in2 = 0.72), then the stresses were very comparable. Two methods were used to estimate the pile capacities: The UF method and the Tran et al. methods. The UF method (employed in SmartPile Review) uses the Case capacity equation with variable case damping, Jc, to assess total capacity and the Unloading Point Method for tip resistance, (i.e., skin friction = total – tip resistance). The Tran et al. method computes side friction using a segmental approach and tip resistance using conservation of force and energy. The Tran et al. method for side friction showed a smaller difference (6%) in predicted capacities between top solid and voided gauge sets than the UF method (23%) using the Case Equation for the four voided test piles.