Calibration of Load and Resistance Factors in LRFD Foundation Design Specifications
1 INTRODUCTION 1.1 Background
Since October 2007, all state departments of transportation in the U.S. have been mandated to use the AASHTO load and resistance factored design (LRFD) specifications (2007) in their federally funded bridge projects. In Missouri, these specifications, including the effects of foundation settlement in bridge designs, had not been calibrated with its load conditions and environmental factors. As a critical part of a bridge system, the foundation not only affects the safety and stability of the overall system, but also constitutes a significant portion of bridge construction costs. Therefore, better calibrations with field data are imperative.
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