A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
CDOT Foundation Design Practice and LRFD Strategic Plan
The Colorado Department of Transportation (CDOT) has adopted the AASHTO LRFD Bridge Design Specifications for the design of all highway bridges. This prompt implementation of the LRFD code was possible because of the history of LFD and ASD designs and the uniformity of the structural materials, concrete and steel. The implementation of geotechnical LRFD is hampered by the non-uniformity of the geological materials, soils and rocks, which requires the evaluation of the state-specific resistance factors. The process of evaluation and calibration of resistance factors is complex and time-consuming. It is based on the theory of probability and reliability. It requires the creation of a property database through a long-term data collection, the evaluation of property statistics, the formulation of probability density function for each property of each geological material, the determination of probability of failure, and the selection of reliability of index. In civil engineering designs the failure probability is determined by a code committee and, in the AASHTO code, the failure probability is determined to be 1/10,000. Fostering a smooth process for the design of bridges and bridge foundations requires the implementation of both structural and geotechnical LRFD procedures. The FHWA has set the Year 2007 as the target time for the full implementation of the AASHTO LRFD Bridge Design Specifications and it is urgent for CDOT to devote effort to the implementation of geotechnical LRFD, which requires both financial and time commitment from all concerned parties, particularly the CDOT Central Administration. This study has found that the CDOT geotechnical practice is severely deficient in manpower and field test equipment. Without immediate remedial actions the quality of CDOT geotechnical services will be of great concern. The formation of an LRFD Committee with members from the CDOT Administration, Bridge Branch, Materials Laboratory (Geotechnical and Soil-Rockfall Programs), and Research Branch; structural and geotechnical engineering communities; and academia is recommended to strategize the implementation of the geotechnical LRFD procedures.
CDOT Foundation Design Practice and LRFD Strategic Plan
The Colorado Department of Transportation (CDOT) has adopted the AASHTO LRFD Bridge Design Specifications for the design of all highway bridges. This prompt implementation of the LRFD code was possible because of the history of LFD and ASD designs and the uniformity of the structural materials, concrete and steel. The implementation of geotechnical LRFD is hampered by the non-uniformity of the geological materials, soils and rocks, which requires the evaluation of the state-specific resistance factors. The process of evaluation and calibration of resistance factors is complex and time-consuming. It is based on the theory of probability and reliability. It requires the creation of a property database through a long-term data collection, the evaluation of property statistics, the formulation of probability density function for each property of each geological material, the determination of probability of failure, and the selection of reliability of index. In civil engineering designs the failure probability is determined by a code committee and, in the AASHTO code, the failure probability is determined to be 1/10,000. Fostering a smooth process for the design of bridges and bridge foundations requires the implementation of both structural and geotechnical LRFD procedures. The FHWA has set the Year 2007 as the target time for the full implementation of the AASHTO LRFD Bridge Design Specifications and it is urgent for CDOT to devote effort to the implementation of geotechnical LRFD, which requires both financial and time commitment from all concerned parties, particularly the CDOT Central Administration. This study has found that the CDOT geotechnical practice is severely deficient in manpower and field test equipment. Without immediate remedial actions the quality of CDOT geotechnical services will be of great concern. The formation of an LRFD Committee with members from the CDOT Administration, Bridge Branch, Materials Laboratory (Geotechnical and Soil-Rockfall Programs), and Research Branch; structural and geotechnical engineering communities; and academia is recommended to strategize the implementation of the geotechnical LRFD procedures.
CDOT Foundation Design Practice and LRFD Strategic Plan
N. Y. Chang (author)
2006
214 pages
Report
No indication
English
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