Abstract
Pursuing current global trend to practice a reliability-based pile design methodology, most codes have calibrated resistance factors accounting for the strength limit, while the serviceability limit is still being assessed following a deterministic approach. Recently, the Load and Resistance Factor Design (LRFD) parameters were regionally developed by AbdelSalam et al. (2015) for the strength limit utilizing the electronic database “EGYptian Pile Test”. This database contained results from more than 320 pile load test, most of them for large diameter bored piles. In this study, the database was upgraded to include load-transfer outcomes for all the available data using finite difference program Allpile v.6.5, which provided separate skin- and end-bearing behaviors. In addition, the total load-displacement acquired from the load-transfer analysis was employed to develop the LRFD resistance factors for groups of piles sorted by pile diameter, length, and soil conditions. These resistance factors were calculated based on limited total settlement of 1% and 2.5% of the pile diameter, which indirectly accounts for the serviceability limits. A comparison between the strength- and the serviceability-based resistance factors was conducted, and it was found that designs based on the serviceability is more efficient in case of large diameter bored piles.
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The authors are grateful to the British University in Egypt (BUE) at which some of this research was conducted as part of final year graduation project.
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El-Naggar, H., Ahmed, M., AbdelSalam, S. (2018). Reliability of Load-Transfer Approach in the Design of Large Diameter Bored Piles. In: Abu-Farsakh, M., Alshibli, K., Puppala, A. (eds) Advances in Analysis and Design of Deep Foundations. GeoMEast 2017. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-61642-1_8
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