Analysis of Spread Footing Foundations as a Highway Bridge Alternative PDF Download
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Author: Jill L. Meranda
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 285
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Book Description
Author: Jill L. Meranda
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 285
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Book Description
Author: Sedtha Mahasantipiya
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 174
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Author: Shad M. Sargand
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 338
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Book Description
Spread footing foundations have been used to support various types of civil engineering structures over the years. However, one type of structure to which they have not seen much widespread application is highway bridges. This is because bridge engineers generally take a rather conservative approach and specify deep foundations, such as H-piles and drilled pier shafts, to support the bridge superstructure weight and live loads. In the current research project, the ORITE team continued to investigate several technical aspects related to spread footing foundations. Four additional spread footings constructed at two interstate highway construction sites were instrumented with modern sensors and monitored through construction stages and beyond. The spread footing design methods presented in the AASHTO LRFD Bridge Design Specifications (2004) were validated on the basis of the field performance data accumulated during the ORITE research project(s). Twelve SPT-based settlement prediction methods (for footings resting on cohesionless or slightly cohesive soils) were evaluated in light of the field performance data. General performance analysis of spread footing foundations at bridge construction sites was made to draw some guidelines concerning the use of spread footings for supporting highway bridge structures. Finally, detailed cost comparisons were made between spread footing and pile foundation options. Overall, the results of the research project indicated that: 1) spread footing can be a viable option as the highway bridge foundation; and 2) the design methods presented in the AASHTO LRFD Bridge Design Specifications (2004) appear to be satisfactory.
Author: Naresh C. Samtani
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 84
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Book Description
The FHWA believes that spread footings on soils are underutilized because designers encounter one or more of the following obstacles: (a) limited knowledge of AASHTO/FHWA technical references that pertain to spread footings on soils to support bridges; (b) limited knowledge of adequate performance data for spread footings; (c) unrealistic tolerable settlement criteria; (d) overestimation of loads used to calculate settlement; and (e) the use of conservative settlement prediction methods. These obstacles have resulted in institutional biases and overly conservative and excessively costly institutional processes that lead to the unnecessary use of costlier deep foundation systems. The primary goal of this report is to promote the use of spread footings bearing on competent natural soils, improved soils, and engineered fill materials as a routine alternative to deep foundations for support of bridges by addressing the factors identified above. Documented performance data is used to make this case. The report also presents powerful concepts such as construction-point analysis and angular distortions to demonstrate the efficacy of using spread footings. Implementation of these concepts requires only that conventional computations be taken one step further without any requirement for advanced computational skills. The report presents sources of information that agencies and designers can use as references in their project applications. The report contains comprehensive appendices that treat in detail many of the topics discussed in the report. For example, one such appendix provides an introduction to Load and Resistance Factor Design (LRFD) that permits a rational approach to the consideration of spread footings on soils as a feasible alternative to deep foundations.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 242
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Book Description
"A long-term study of the settlement performance of 21 bridge foundations supported on cohesionless soil-sand or silt- was completed to provide a reliable data base for engineering evaluation"--Abstract
Author:
Publisher: Transportation Research Board
ISBN: 0309154677
Category : Technology & Engineering
Languages : en
Pages : 149
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Book Description
This report develops and calibrates procedures and modifies the AASHTO LRFD Bridge Design Specifications, Section 10-Foundations for the Strength Limit State Design of Shallow Foundations. The material in this report will be of immediate interest to bridge engineers and geotechnical engineers involved in the design of shallow foundations.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 838
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Author: United States. Federal Highway Administration
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 516
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Author: J.-L. Briaud
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 272
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Book Description
Contains the results of a full scale load testing program used to predict and measure the behaviour of five spread footings on sand. This title presents the data upon which all predictions are based; describes methodologies and judgments used to make the predictions; and also summarizes the predictions and compares predicted responses.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 36
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Book Description
