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Evaluation Of Unknown Foundations
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Book Synopsis Evaluation of Unknown Foundations by : Ronald W. Florkowski
Download or read book Evaluation of Unknown Foundations written by Ronald W. Florkowski and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: In recent years, bridge foundations have been in the spotlight throughout the nation. Bridges built over running water are susceptible to erosion or scour around their foundations. The reduction in load capacity to piers and abutments pose a safety risk to highway motorists. It has become necessary for engineers to examine and monitor these "scour critical" bridges. The difficulty arises with subsurface foundations of which very little is known about their construction. Hence, the methods applied to analyzing "Unknown Foundations" have become a necessary topic of research. This thesis explores a method to determine foundation lengths. Similar to Sonic Echo / Impulse Response, this procedure measures reflected shock waves sent through concrete pilings. The technique is non-destructive in nature and is performed near the surface of the foundation. The test is performed on the side of the exposed piling. Current methods are limited by the fact that the tops of most pilings are inaccessible due to pilecaps or beams. Often times, pilings are embedded in stiff soils, which have a dampening effect on the stress waves. This thesis employs a method of analysis that will overcome such limitations and provide engineers with another tool to determine subsurface foundation lengths.
Book Synopsis Evaluation of Resistivity Imaging (RI) Method for Determining Unknown Deep Foundation Depth by : Mohammad Sadik Khan
Download or read book Evaluation of Resistivity Imaging (RI) Method for Determining Unknown Deep Foundation Depth written by Mohammad Sadik Khan and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There are approximately 580,000 highway bridges in the National Bridge inventory and 104,000 of these bridges are estimated to have unknown foundations type and/or depth. Determining unknown foundation length and type of bridge foundation is becoming an important issue for State DOTs to ensure the safety of the bridge. There are several methods available to determine unknown foundation depth based on specific site conditions and type of foundation to be tested. Resistivity Imaging (RI) is a non destructive method to investigate the subsurface condition. The objective of current study was to determine unknown bridge foundation depth of three bridges at North Texas using RI method. Two of the investigated bridges were supported by driven steel H-pile and the other bridge had drill shaft as foundation. Based on RI results, unknown foundation depth were determined from the variation of resistivity below the foundation. Parallel Seismic (PS) and Sonic Echo (SE) method were also utilized for one bridge site supported by steel H pile to verify the depth determined by RI method. PS method was performed in two casing backfilled with sand and cement grout. The investigated unknown bridge foundation depths using RI method were compared with the actual foundation depth. The determined unknown foundation depths from RI method were found very close to actual foundation depth for two steel H-pile sites. However, no significant variation of resistivity was observed below the foundation of third bridge supported by drill shaft and the determined foundation depth for third bridge site did not match the actual foundation depth. PS method also predicted the depth of the foundation very close to actual foundation depth. However, the SE test was determined to be not suitable for determining the unknown steel H-pile foundation depth.
Book Synopsis Guideline for Nondestructive Evaluation of Unknown Subsurface Bridge Foundation Depths by : Olson Engineering Inc
Download or read book Guideline for Nondestructive Evaluation of Unknown Subsurface Bridge Foundation Depths written by Olson Engineering Inc and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FHWA Unknown Foundations Summit Program by :
Download or read book FHWA Unknown Foundations Summit Program written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a forum for discussing techniques available to manage bridges with unknown foundations, and for evaluating the capability, reliability, and probable cost of nondestructive methods for determining unknown bridge foundation components.
Book Synopsis Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods by : Behnoud Kermani
Download or read book Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods written by Behnoud Kermani and published by . This book was released on 2013 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proper design of bridge structures requires an appreciation for the possible failure mechanisms that can develop over the lifetime of the bridge, many of which are related to natural hazards. For example, scour is one of the most common causes of bridge failures. Scour occurs due to the erosion of soil and sediment within a channel with flowing water. During a flood event, the extent of scour can be so great that it can destabilize an existing bridge structure. In order to evaluate the scour potential of a bridge, it is necessary to have information regarding the substructure, particularly the bridge foundations. However, as of 2011 there are more than 40,000 bridges across United States with unknown foundations. Generally for these bridges there are no design or as-built plans available to show the type, depth, geometry, or materials incorporated into the foundations. Several non-destructive testing (NDT) methods have been developed to evaluate these unknown foundations. The primary objective of this research is to identify the most current and widely used NDT methods for determining the embedment depth of unknown bridge foundations and to compare these methods to an ultrasonic P-wave reflection imaging system. The ultrasonic P-wave reflection system has tremendous potential to provide more information and address several short-comings of other NDT methods. A laboratory study was initiated to explore various aspects related to the P-wave system performance, in order to characterize the limitations of the system in evaluation of unknown foundations prior to deployment in field studies. Moreover, field testing was performed using the P-wave system and a number of the current NDT methods at two selected bridge foundations to allow comparison between the results.
Book Synopsis Strategies for Managing Unknown Bridge Foundations by : Victor Elias
Download or read book Strategies for Managing Unknown Bridge Foundations written by Victor Elias and published by . This book was released on 1994 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation for Foundations by : Council on Foundations
Download or read book Evaluation for Foundations written by Council on Foundations and published by Jossey-Bass. This book was released on 1993-05-04 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shows how foundations can use evaluation to strengthen their own and their grantees' programs. Introduces the concept of evaluation and offers practical, how -to advice for foundations interested in, or beginning to formulate a strategy for, evaluation. Part one describes the issues a foundation should consider and provides guidance for developing an evaluation plan and interpreting evaluation results. Part two uses nine case studies to illustrate how real foundations, faced with choices for evaluating projects or programs, made those choices; what kinds of evaluations were conducted, by whom, and what they found; and what the foundations and others thought of the results. The conclusion distills from the case studies thirty-five keys to effective evaluating for foundations. Includes a glossary of terms and an annotated bibliography.
Book Synopsis Model Uncertainties in Foundation Design by : Chong Tang
Download or read book Model Uncertainties in Foundation Design written by Chong Tang and published by CRC Press. This book was released on 2021-03-16 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model Uncertainties in Foundation Design is unique in the compilation of the largest and the most diverse load test databases to date, covering many foundation types (shallow foundations, spudcans, driven piles, drilled shafts, rock sockets and helical piles) and a wide range of ground conditions (soil to soft rock). All databases with names prefixed by NUS are available upon request. This book presents a comprehensive evaluation of the model factor mean (bias) and coefficient of variation (COV) for ultimate and serviceability limit state based on these databases. These statistics can be used directly for AASHTO LRFD calibration. Besides load test databases, performance databases for other geo-structures and their model factor statistics are provided. Based on this extensive literature survey, a practical three-tier scheme for classifying the model uncertainty of geo-structures according to the model factor mean and COV is proposed. This empirically grounded scheme can underpin the calibration of resistance factors as a function of the degree of understanding – a concept already adopted in the Canadian Highway Bridge Design Code and being considered for the new draft for Eurocode 7 Part 1 (EN 1997-1:202x). The helical pile research in Chapter 7 was recognised by the 2020 ASCE Norman Medal.
Book Synopsis Evaluating Scour at Bridges by : E. V. Richardson
Download or read book Evaluating Scour at Bridges written by E. V. Richardson and published by . This book was released on 1991 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document, Hydraulic Engineering Circular No. 18 (HEC-18), contains the state-of-knowledge and practice for dealing with scour at highway bridges. The procedures for designing new, replacement and rehabilitated bridges to resist scour are presented. Procedures are presented for evaluating the scour vulnerability of existing bridges as well as inspecting bridges for scour. The use of countermeasures to protect bridges evaluated as failure prone due to scour is also presented. This document replaces the Federal Highway Administration (FHWA) publication "Interim Procedures for Evaluating Scour at Bridges," which was issued with FHWA Technical Advisory 5140.20, "Scour at Bridges," in September 1988.
Author :United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Transportation and Related Agencies Appropriations Publisher : ISBN 13 : Total Pages :1036 pages Book Rating :4.0/5 (8 download)
Book Synopsis Department of Transportation and Related Agencies Appropriations for 2002 by : United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Transportation and Related Agencies Appropriations
Download or read book Department of Transportation and Related Agencies Appropriations for 2002 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Dept. of Transportation and Related Agencies Appropriations and published by . This book was released on 2001 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NUREG/CR. by : U.S. Nuclear Regulatory Commission
Download or read book NUREG/CR. written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1981 with total page 874 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Scour Evaluation by : John Kattell
Download or read book Bridge Scour Evaluation written by John Kattell and published by . This book was released on 1998 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nondestructive Evaluation of Bridges and Highways by :
Download or read book Nondestructive Evaluation of Bridges and Highways written by and published by . This book was released on 1996 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multihazard Considerations in Civil Infrastructure by : Mohammed M. Ettouney
Download or read book Multihazard Considerations in Civil Infrastructure written by Mohammed M. Ettouney and published by CRC Press. This book was released on 2016-11-30 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explains and presents the need for Multihazard Consideration (MH) in the management of civil infrastructure, what constitutes MH, and how to address MH in design and analysis. A generalized theory of MH will serve as the basis of the objective treatment of this volume. Use of MH in bridge management (inspection, maintenance, rehabilitation, and replacement) will serve as the basis for several examples, and numerous case studies will be presented throughout.
Book Synopsis Laterally Loaded Deep Foundations by : James A. Langer
Download or read book Laterally Loaded Deep Foundations written by James A. Langer and published by ASTM International. This book was released on 1984 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Developmental Evaluation by : Michael Quinn Patton
Download or read book Developmental Evaluation written by Michael Quinn Patton and published by Guilford Press. This book was released on 2010-06-14 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developmental evaluation (DE) offers a powerful approach to monitoring and supporting social innovations by working in partnership with program decision makers. In this book, eminent authority Michael Quinn Patton shows how to conduct evaluations within a DE framework. Patton draws on insights about complex dynamic systems, uncertainty, nonlinearity, and emergence. He illustrates how DE can be used for a range of purposes: ongoing program development, adapting effective principles of practice to local contexts, generating innovations and taking them to scale, and facilitating rapid response in crisis situations. Students and practicing evaluators will appreciate the book's extensive case examples and stories, cartoons, clear writing style, "closer look" sidebars, and summary tables. Provided is essential guidance for making evaluations useful, practical, and credible in support of social change.
Book Synopsis LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures by :
Download or read book LRFD Design and Construction of Shallow Foundations for Highway Bridge Structures written by and published by Transportation Research Board. This book was released on 2010 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
