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LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures, National Cooperative Highway Research Program (NCHRP) Report 651

机译：公路桥梁结构浅基础LRFD设计与施工，国家合作公路研究计划（NCHRp）报告651

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NCHRP Project 24-31, LRFD Design Specifications for Shallow Foundations was initiated with the objective to develop recommended changes to Section 10 of the AASHTO LRFD Bridge Design Specifications for the strength limit state design of shallow foundations. The AASHTO specifications are traditionally observed on all federally aided projects and are generally viewed as the national code of U.S. highway practice; hence, they influence the construction of all foundations of highway bridges throughout the United States. This report represents the results of the studies and analyses conducted for NCHRP Project 24-31. The current AASHTO specifications, as well as other existing codes employing reliabilitybased design (RBD) principles, were calibrated using a combination of reliability theory, fitting to allowable stress design (ASD) (also called working stress design (WSD)), and engineering judgment. The main challenges of the project were, therefore, the compilation of large, high-quality databases of tested foundations to failure and the development of a procedural and data management framework that would enable Load and Resistance Factor Design (LRFD) parameter evaluation for the strength limit state of shallow foundations. The presented research is the first to introduce large-scale, RBD calibration of shallow foundations utilizing databases.

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