LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures (2010) / Chapter Skim
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Pages 52-56
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From page 52... ...
Unit II(a) addresses the effort required for the development of resistance factors for shallow foundations constructed on granular soils, outlined in Figure 43.
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From page 53... ...
6, Kimmerling, 2002 FHWA Spread Footings of Highway Bridges, Gifford et al., 1987 FHWA Soils & Foundations Workshop Manual, Cheney & Chassie, 1982 NCHRP Project 24-31 Questionnaire Determination of DOT Design Methods and Construction Practices of Shallow Foundations UDE Institute of Soil Mechanics & Foundation Engineering Examination of Load Ranges and Statistics of Horizontal and Vertical Loading for the Typical Design Examples and Case Histories Available Questionnaires of Foundations Design Methods and Construction Practices NCHRP Report 507, Paikowsky et al., 2004 NCHRP Project 12-66, Paikowsky et al., 2005 Established: AASHTO/FHWA and DOTs' Design Methods Complementary and/or Alternative Design Methods Typical Structures under Common Construction Practices Design Cases Load Ranges and their Distributions Determination of Alternative Design Methods Design Cases in Manuals FHWA GEC No. 6, Kimmerling, 2002 FHWA Soils & Foundation Workshop Manual, Cheney & Chassie, 1982 FHWA RD-86/185, Gifford et al., 1987 Examination of Lateral Loads Data on Structures Gifu Univ., Japan Japan Geotech.
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From page 54... ...
β used in NCHRP Project 24-17 & Other Codes Worldwide Resistance Factors for BC Load Ranges and Distributions Unit I(a) Examine Typical Structures/Case Histories Final Resistance Factors and Conditions for Implementation AASHTO Modified Specification Notes: BC – Bearing Capacity β – Target Reliability SLS – Serviceability Limit State ULS – Ultimate Limit State Establish the Uncertainty of the Models Database III β Figure 44.
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From page 55... ...
Simplified example of a beam design and associated sources of uncertainty. Soil sampling and testing for engineering material parameters Uncertainty due to site, material and testing variability, and estimation of parameters Uncertainty in the assumptions made in the model development leaves unknown analysis versus actual performance FOUNDATION DESIGN Sources of Uncertainty Material properties and strength parameters Resistance model Loading Code of practice Traditional design, although developed over many years and used as a benchmark, has undocumented, unknown uncertainty Analysis model Assumed Failure Pattern under Foundations Loading Method of Approach LOAD Use the load uncertainty from the structures (until better research is done)
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From page 56... ...
limit state equations to be evaluated. Section 3.1 outlines the findings for establishing the state of practice in design and construction leading to Section 3.4 presenting the selected bearing capacity methodology for soils and Section 3.8 the bearing capacity methodology for foundations on rock.
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