Index Catalog // Arch : Northwestern University Institutional Repository

1. Geo-Measurements with Metallic TDR Cable Technology for Infrastructure Surveillance

Description:: This paper reviews the new field of geo-measurement with metallic cable time domain reflectometry (TDR) for surveillance of transportation facilities. TDR is radar in a coaxial cable, and is especially advantageous for remote monitoring because of its inherently digital nature. Advances can be separated into those that leverage use of...
Keyword:: Structural health monitoring and Time-domain reflectometry
Creator:: Charles H. Dowding
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2011-07-27
Resource Type:: Research Paper

2. Blast Induced Micrometer Response of Cracks in Concrete Block Structures

Description:: Blasting and climatological response of cracks are compared for structures constructed of concrete block typical of home construction in Europe. While much has been written comparing micrometer crack response of wood frame structures typical of residential construction in North America, little has been written concerning response of structures more typical...
Keyword:: vibration and climatological crack
Creator:: Charles H. Dowding
Owner:: Chris Diaz
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2007
Resource Type:: Research Paper

3. Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

Description:: This paper describes qualification of devices to measure sub micro-meter changes in crack width, which is the basis of autonomous crack monitoring for control of blasting vibrations. Performance of LVDT, eddy current and potentiometer sensors to monitor long-term and transient displacements will be described. Potentiometers are attractive for wireless measurement,...
Keyword:: Structural health monitoring
Creator:: Hasan Ozer, Charles H. Dowding, and Dan Marron
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2007
Resource Type:: Research Paper

4. Crack Measurement: New Approach to Addressing Blasting Complaints

Keyword:: crack response and vibration-induced cracking
Creator:: Charles H. Dowding
Owner:: Chris Diaz
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2001
Resource Type:: Article

5. Micro-Meter Measurement of Cracks to Compare Blast and Environmental Effects

Description:: Concern over construction vibration-induced cracking has led to development of a new approach to vibration monitoring called autonomous crack measurement (ACM) and illustrated in Figure 1. This paper describes the concept as well as sensor performance in the first test house fitted an ACM system. Response of three cracks in...
Keyword:: concrete masonry unit
Creator:: Charles H. Dowding and Michael Louis
Owner:: Chris Diaz
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2003
Resource Type:: Article

6. Response of Cracks to Construction Vibrations and Environmental Effects

Description:: This paper summarizes micro-inch response of cosmetic cracks in a typical slab-ongrade ranch style house to both construction equipment-induced vibration and environmental (weather) effects. This structure was instrumented, and its response studied as part of the development of an Autonomous Crack Measurement (ACM) system. ACM systems are intended to record...
Keyword:: Autonomous Crack Measurement
Creator:: Charles H. Dowding and Mickey L. Snider
Owner:: Chris Diaz
Publisher:: American Society of Civil Engineers
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2004
Resource Type:: Part of Book

7. Response of Uncracked Drywall Joints and Panels to Blast Vibration and Weather

Description:: Cracking is one of the most common concerns cited by owners of structures adjacent to construction or mining blasting. While a large database of case studies documenting the relative insignificance of ground motion induced by responsible blasting compared to weather effects on cracks in nearby structures has been established, the...
Keyword:: Autonomous Crack Measurement
Creator:: Charles H. Dowding and Jeffrey E. Meissner
Owner:: Chris Diaz
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2011
Resource Type:: Research Paper

8. Real Time Monitoring of Infrastructure Using TDR Technology: Principles

Description:: This presentation is intended to provide background on the principles involved in geotechnical and infrastructure applications of Time Domain Reflectometry (TDR). TDR is basically radar in which a voltage pulse is launched along a coaxial cable. A reflection of the voltage pulse occurs at every location where the cable is...
Keyword:: Time-domain reflectometry and Structural health monitoring
Creator:: Charles H. Dowding and Kevin M. O'Connor
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Library
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2000
Resource Type:: Report

9. Real Time Monitoring of Infrastructure Using TDR Technology: Case Histories

Description:: Time Domain Reflectometry (TDR) is a versatile technology amenable to a variety of measurements and nondestructive monitoring of infrastructure conditions. It can be utilized to monitor deformation of soil/rock and structures, monitor changes in fluid levels, and monitor water content of soils. Furthermore, this monitoring can be automated using systems...
Keyword:: Time-domain reflectometry and Structural health monitoring
Creator:: Charles H. Dowding and Kevin M. O'Connor
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Library
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2001
Resource Type:: Report

10. Addendum I: Direct Measurement of Crack Response of Four OSM Study Structures

Description:: This appendix synthesizes micrometer changes in crack width in response to both long term (environmental) and transient (blast vibration) of four of the structures in the main body. The appendix begins with a description of the genesis of the study and instruments employed. Response of the distressed wood-framed structure in...
Keyword:: Structural health monitoring
Creator:: Charles H. Dowding and Laureen M. McKenna
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2003
Resource Type:: Other

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1. Geo-Measurements with Metallic TDR Cable Technology for Infrastructure Surveillance

2. Blast Induced Micrometer Response of Cracks in Concrete Block Structures

3. Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

4. Crack Measurement: New Approach to Addressing Blasting Complaints

5. Micro-Meter Measurement of Cracks to Compare Blast and Environmental Effects

6. Response of Cracks to Construction Vibrations and Environmental Effects

7. Response of Uncracked Drywall Joints and Panels to Blast Vibration and Weather

8. Real Time Monitoring of Infrastructure Using TDR Technology: Principles

9. Real Time Monitoring of Infrastructure Using TDR Technology: Case Histories

10. Addendum I: Direct Measurement of Crack Response of Four OSM Study Structures

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1. Geo-Measurements with Metallic TDR Cable Technology for Infrastructure Surveillance

2. Blast Induced Micrometer Response of Cracks in Concrete Block Structures

3. Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

4. Crack Measurement: New Approach to Addressing Blasting Complaints

5. Micro-Meter Measurement of Cracks to Compare Blast and Environmental Effects

6. Response of Cracks to Construction Vibrations and Environmental Effects

7. Response of Uncracked Drywall Joints and Panels to Blast Vibration and Weather

8. Real Time Monitoring of Infrastructure Using TDR Technology: Principles

9. Real Time Monitoring of Infrastructure Using TDR Technology: Case Histories

10. Addendum I: Direct Measurement of Crack Response of Four OSM Study Structures