07-02-2011, 03:25 AM
11-10-2012, 05:36 PM
Design of Pile Foundations
Design of Pile Foundations.pdf (Size: 906.32 KB / Downloads: 211) INTRODUCTION This manual provides information, foundation exploration and testing procedures, load test methods, analysis techniques, design criteria and procedures, and construction considerations for the selection, design, and installation of pile foundations. The guidance is based on the present state of technology for pile-soil-structure-foundation interaction behavior. This manual provides design guidance intended specifically for geotechnical and structural engineers and essential information for others interested in understanding construction techniques related to pile behavior during installation. The understanding of pile foundation behavior is actively expanding by ongoing research, prototype, model pile, and pile group testing and development of more refined analytical models. However, this manual is intended to provide examples and procedures of proven technology. This manual will be updated as changes in design and installation procedures are developed. GENERAL CONSIDERATIONS 2-1. General. Many factors must be considered when selecting an appropriate foundation for a hydraulic structure. This chapter presents criteria and methods for selecting the best type of foundation. Information is presented to identify the feasible foundation alternatives for more detailed study. The final selection should be based on an evaluation of engineering feasibility and comparative costs for the potential alternatives considering such factors as safety, reliability, constructability, and life cycle performance. This chapter also presents general criteria for feature design. Such criteria pertain to the type and function of the structure, the nature of the applied loads, and the type of foundation material. The requirements for a subsurface investigation program are also presented. Nature of Loadings. a. Usual. Usual loads refer to conditions which are related to the primary function of a structure and can be reasonably expected to occur during the economic service life. The loading effects may be of either a long term, constant or an intermittent, repetitive nature. Pile allowable loads and stresses should include a conservative safety factor for such conditions. The pile foundation layout should be designed to be most efficient for these loads. Foundation Material. a. Known Data. After a general site for a project is selected, the designer should make a site visit to examine the topography at the site. Rock outcrops or highway cuts on or near the site may provide valuable information of the subsurface conditions. An examination of existing structures in the vicinity may also provide information. A visit to the local building department may provide foundation information and boring logs for nearby buildings. The highway department may have soil and geological information in the area for existing roads and bridges. Valuable soil and geological information can be obtained from other governmental agencies, such as the United States Geological Survey (USGS), Soil Conservation Service (SCS), Bureau of Records, etc., for even remotely located areas. Colleagues may be able to provide information on projects they have worked on in the area. Check the files for previous jobs your office might have built or explored in the area. |
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