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Geomechanics and Engineering
  Volume 11, Number 2, August 2016 , pages 211-234

Characterization and uncertainty of uplift load-displacement behaviour of belled piers
Xian-long Lu, Zeng-zhen Qian, Wei-feng Zheng and Wen-zhi Yang

    A total of 99 full-scale field load tests at 22 sites were compiled for this study to elucidate several issues related to the load-displacement behaviour of belled piers under axial uplift loading, including (1) interpretation criteria to define various elastic, inelastic, and "failure" states for each load test from the load-displacement curve; (2) generalized correlations among these states and determinations to the predicted ultimate uplift resistances; (3) uncertainty in the resistance model factor statistics required for reliability-based ultimate limit state (ULS) design; (4) uncertainty associated with the normalized load-displacement curves and the resulting model factor statistics required for reliability-based serviceability limit state (SLS) design; and (5) variations of the combined ULS and SLS model factor statistics for reliability-based limit state designs. The approaches discussed in this study are practical and grounded realistically on the load tests of belled piers with minimal assumptions. The results on the characterization and uncertainty of uplift load.displacement behaviour of belled piers could be served as to extend the early contributions for reliability-based ULS and SLS designs.
Key Words
    belled piers; uplift; load tests; reliability-based design; model uncertainty; normalized load-displacement curve; hyperbolic curve-fitting parameters
(1) Xian-long Lu, Wei-feng Zheng, Wen-zhi Yang:
China Electric Power Research Institute, No. 15, Xiaoying East Road, Haidian District, Beijing, 100192, China;
(2) Zeng-zhen Qian:
School of Engineering and Technology, China University of Geosciences, No. 29 Xueyuan Road, Haidian District, Beijing, 100083, China.

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