Current Design and Construction Practices of Bridge Pile Foundations with Emphasis on Implementation of LRFD
Current Design and Construction Practices of Bridge Pile Foundations with Emphasis on Implementation of LRFD
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DOI：
10.1061/(asce)be.1943-5592.0000118
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发表时间：
2010-11
影响因子：
3.6
通讯作者：
S. AbdelSalam;S. Sritharan;M. Suleiman
中科院分区：
文献类型：
--
作者：
S. AbdelSalam;S. Sritharan;M. Suleiman
联邦公路管理局（FHWA）规定，2007年9月以后，美国所有新建桥梁均应采用荷载和抗力系数设计（LRFD）方法。本文介绍了通过2008年全国30多个DOT的调查建立的桥梁深基础实践。这项研究强调的是LRFD的好处，以及如何在设计实践中利用其使用的灵活性。这项研究收集了有关当前基础实践、桩分析和设计、桩可打入性、桩设计验证和质量控制的信息。由于这是在FHWA授权后对LRFD主题进行的第一次全国性研究，因此还检查了LRFD在桥梁基础设计中的实施情况。研究发现：（1）超过50%的运输署署长正在使用长桩参考图进行桩柱设计，而30%的运输署署长仍在过渡使用长桩参考图;及（2）约30%的运输署署长在使用长桩参考图进行桩柱基础设计时，正在使用经地区校正的阻力系数，以减低基础成本。
The Federal Highway Administration (FHWA) mandated the use of the load and resistance factor design (LRFD) approach in the U.S. for all new bridges initiated after September 2007. This paper presents the bridge deep foundation practices established through a nationwide survey of more than 30 DOTs in 2008. Highlighted by this study are the benefits of the LRFD as well as how the flexibility of its usage is being exploited in design practice. The study collected information on current foundation practice, pile analysis and design, pile drivability, pile design verification, and quality control. Since this is the first nationwide study conducted on the LRFD topic following the FHWA mandate, the status on the implementation of LRFD for bridge foundation design was also examined. The study found that: (1) more than 50% of the responded DOTs are using the LRFD for pile design, while 30% are still in transition to the LRFD; and (2) about 30% of the DOTs, who use the LRFD for pile foundations, are using regionally calibrated resistance factors to reduce the foundation costs.