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Description:: The segmental prestressed concrete box girder of Koror-Babeldaob (KB) Bridge in Palau, which had the record span of 241 m (791 ft.), presents a striking paradigm of serviceability loss due to excessive multi-decade deflections. The data required for analysis have recently been released and are here exploited to show how...
Keyword:: Nondestructive testing
Creator:: Qiang Yu, Zdenek P. Bazant , and Guang-Hua Li
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/26/2017
Date Modified:: 07/26/2017
Date Created:: 2009-12
Resource Type:: Report

Description:: Non-destructive evaluation (NDE) techniques have been used for a number of years to provide quality control of construction procedures for drilled shafts and driven concrete piles. In particular sonic echo and impulse response methods have been used extensively to check lengths and continuity of newly-installed foundations. In recent years, the...
Keyword:: Test section , Deep foundation , and Nondestructive testing
Creator:: Richard J. Finno , Peter W. Osborn, and Sarah L. Gassman
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/12/2017
Date Modified:: 08/14/2017
Date Created:: 1997-06
Resource Type:: Report

Description:: This paper presents the results of 159 finite element simulations conducted to define the effects of excavation geometry, i.e., length, width and depth of excavation, wall system stiffness, and factor of safety against basal heave on the 3-dimensional ground movements caused by excavation through clays. The results of the analyses...
Keyword:: Excavation, Three-dimensional analysis, and Nondestructive testing
Creator:: Jill Frances Roboski, James Tanner Blackburn, and Richard J. Finno
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/12/2017
Date Modified:: 08/14/2017
Date Created:: 2006
Resource Type:: Research Paper

Description:: Two numerical procedures are described that quantitatively identify a set of constitutive parameters that best represents observed ground movement data associated with a deep excavations in urban environments. This inverse problem is solved by minimizing an objective (or error) function of the weighted least-squares type that contains the difference between...
Keyword:: Ground control and Nondestructive testing
Creator:: Cecilia Rechea Bernal
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/12/2017
Date Modified:: 08/14/2017
Date Created:: 2007
Resource Type:: Research Paper

Description:: Performance monitoring of deep excavations typically includes slope inclinometers, optical surveying of soil deformation, tiltmeters and strain gages. Current monitoring data collection and processing requires time consuming site visits and manual data reduction by project engineers. Development of robotic and remote access geotechnical instrumentation conceptually allows processed data to be...
Keyword:: Excavation, Ground control, and Nondestructive testing
Creator:: Miltiadis Langousis
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/12/2017
Date Modified:: 08/14/2017
Date Created:: 2007-03
Resource Type:: Masters Thesis

Description:: This paper describes developments of integrated tools for predicting, monitoring, and controlling ground movements associated with excavations in urban areas. Successful use of monitoring data to update performance predictions of supported excavations depends equally on reasonable numerical simulations of performance, the type of monitoring data used as observations, and the...
Keyword:: Ground control and Nondestructive testing
Creator:: Richard J. Finno and Youssef M. A. Hashash
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/12/2017
Date Modified:: 08/14/2017
Date Created:: 2009
Resource Type:: Research Paper

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