Evaluation and Improvement of Existing Bridge Foundations

摘要

Studies were conducted to develop recommended guidelines for: (1) techniques for evaluating, and (2) design guides and construction methods for improving existing bridge substructures for replacement or rehabilitated bridges. Part I of the report deals with deterioration of bridge substructures, effects of loading and unloading on the foundations, time effects on soil properties, and bearing capacity and settlement of foundations. Part II deals with current methods of inspection, substructure analysis, new methods for evaluating soundness and bearing capacity of foundations, and instrumenting foundations for future performance. Repair methods and techniques to increase the capacity of existing foundations by strengthening the foundation and/or soil and methods for reducing loads on the substructure are covered in Part III. Case histories of bridge substructures, and recommendations for research in the subject area comprise Part IV of the report.