scholarly journals Reliability-Based Design of Driven Piles Considering Setup Effects

2021 ◽  
Vol 11 (18) ◽  
pp. 8609
Author(s):  
Xiaoya Bian ◽  
Jiawei Chen ◽  
Xuyong Chen ◽  
Zhijun Xu
Keyword(s):  
Significant Influence ◽  
Factor Of Safety ◽  
Resistance Factor ◽  
Live Load ◽  
Driven Piles ◽  
Reliability Based Design ◽  
Factor Design ◽  
Load And Resistance Factor ◽  
Ultimate Resistance ◽  
Selection Of

The total ultimate resistance (or bearing capacity) of driven piles considering setup effects is composed of initial ultimate resistance and setup resistance, and the setup effects of driven piles are mainly reflected by the setup resistance. In literature, a logarithmic empirical formula is generally used to quantify the setup effects of driven piles. This paper proposes an increase factor (Msetup) to modify the resistance factor and factor of safety calculation formula in accordance with the load and resistance factor design (LFRD) principle; here, the increase factor is defined as the ratio of the setup resistance (Rsetup) to the initial ultimate resistance (R0) of driven piles. Meanwhile, the correlation between R0 and Rsetup is fully considered in the resistance factor and factor of safety calculation. Finally, the influence of four key parameters (ratio of dead load to live load ρ = QD/QL, target reliability index βT, Msetup, correlation coefficient between R0 and Rsetup, ρR0,Rsetup) on the resistance factor and factor of safety are analyzed. Parametric research shows that ρ has basically no effect on the resistance factor, which can be taken as a constant in further research, and ρ has a significant influence on the factor of safety. The value of Msetup has almost no effect on the resistance factor and factor of safety. However, βT and ρR0,Rsetup have a significant influence on the resistance factor and factor of safety, so the value selection of βT and ρR0,Rsetup are crucial for reliability-based design of driven piles. Through this study, it is concluded that considering setup effects in reliability-based design of driven piles will greatly improve the prediction for design capacity.

Load and Resistance Factor Design (LRFD) for Driven Piles Using Dynamic Methods—A Florida Perspective

2000 ◽  
Vol 23 (1) ◽  
pp. 55 ◽  
Author(s):  
RC Chaney ◽  
KR Demars ◽  
MC McVay ◽  
B Birgisson ◽  
L Zhang ◽  
...  
Keyword(s):  
Resistance Factor ◽  
Driven Piles ◽  
Dynamic Methods ◽  
Factor Design ◽  
Load And Resistance Factor

Incorporating set-up into reliability-based design of driven piles in clay

2006 ◽  
Vol 43 (9) ◽  
pp. 946-955 ◽  
Author(s):  
Luo Yang ◽  
Robert Liang
Keyword(s):  
Resistance Factor ◽  
Driven Piles ◽  
Statistical Parameters ◽  
First Order Reliability Method ◽  
First Order ◽  
Axial Capacity ◽  
Reliability Method ◽  
Factor Design ◽  
Set Up ◽  
Load And Resistance Factor

A statistical database is developed to describe the increase in pile axial capacity with time, known as set-up, when piles are driven into clay. Based on the collected pile testing data, pile set-up is significant and continues to develop for a long time after pile installation. The statistical database shows that normal distribution can be used to properly describe the probabilistic characteristics of predicted set-up capacity by the Skov and Denver equation. The main objective of this paper is to incorporate the set-up effect into a reliability-based load and resistance factor design (LRFD) of driven piles. The statistical parameters for set-up effect combined with the previously documented statistics of load and resistance can be systematically accounted for in the framework of reliability-based analysis using the first-order reliability method (FORM). Separate resistance factors are obtained to account for different degrees of uncertainties associated with measured short-term capacity and predicted set-up capacity at various reliability levels. The incorporation of set-up effect in LRFD can improve the prediction of design capacity of driven piles. Thus, pile length or numbers of pile could be reduced and economical design of driven piles could be achieved.Key words: driven piles, set-up, reliability, load and resistance factor design (LRFD), first-order reliability method (FORM).

Incorporating setup into load and resistance factor design of driven piles in sand

2009 ◽  
Vol 46 (3) ◽  
pp. 296-305 ◽  
Author(s):  
Luo Yang ◽  
Robert Liang
Keyword(s):  
Design Procedure ◽  
Resistance Factor ◽  
Driven Piles ◽  
Pile Setup ◽  
Economical Design ◽  
Reliability Method ◽  
Long Time ◽  
Factor Design ◽  
Total Capacity ◽  
Load And Resistance Factor

A comprehensive database is developed for the setup for piles driven into sand. Based on the compiled pile-testing data, pile setup is significant and continues to develop for a long time after pile installation. The statistical analysis shows that a logarithm-normal distribution can be used to describe the probabilistic characteristics of the predicted setup capacity using the Skov and Denver equation. The main objective of this paper is to incorporate the setup effect into a reliability-based load and resistance factor design (LRFD) of driven piles in sand. The first-order reliability method (FORM) is used to derive separate resistance factors that would account for different degrees of uncertainties associated with measured short-term capacity and predicted setup capacity. The incorporation of setup effects in the LRFD helps improve the prediction of total capacity of driven piles, resulting in more economical design. A practical design procedure within the LRFD framework to incorporate the pile setup effects is outlined.

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