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  1. Crack Measurement: New Approach to Addressing Blasting Complaints

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    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
    Rights: All rights reserved
    Resource Type: Article
  2. Micro-Meter Measurement of Cracks to Compare Blast and Environmental Effects

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    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: Michael Louis and Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2003
    Rights: All rights reserved
    Resource Type: Article
  3. Response of Cracks to Construction Vibrations and Environmental Effects

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    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: Mickey L. Snider and Charles H. Dowding
    Owner: Chris Diaz
    Publisher: American Society of Civil Engineers
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2004
    Rights: All rights reserved
    Resource Type: Part of Book
  4. Blast Induced Micrometer Response of Cracks in Concrete Block Structures

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    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
    Rights: All rights reserved
    Resource Type: Research Paper
  5. Comparison of Micro-inch In-Plane and Out-of-Plane Response of Cracks to Blast Vibration and Weather

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    Description: Most studies of crack response have focused on opening and closing of a crack in the plane of the wall in which the crack occurs. Crack movement also occurs perpendicular or normal to the plane of the wall. This paper will examine and compare the in-plane and out-of-plane (normal) response...
    Keyword: civil engineering
    Creator: Jeffrey E. Meissner, Charles H. Dowding, and Mike J. Waldron
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2010
    Rights: All rights reserved
    Resource Type: Research Paper
  6. Response of Uncracked Drywall Joints and Panels to Blast Vibration and Weather

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    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: Jeffrey E. Meissner and Charles H. Dowding
    Owner: Chris Diaz
    Date Uploaded: 08/14/2017
    Date Modified: 08/14/2017
    Date Created: 2011
    Rights: All rights reserved
    Resource Type: Research Paper
  7. Real Time Monitoring of Infrastructure Using TDR Technology: Principles

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    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: Structural health monitoring and Time-domain reflectometry
    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
    Rights: All rights reserved
    Resource Type: Report
  8. Real Time Monitoring of Infrastructure Using TDR Technology: Case Histories

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    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: Structural health monitoring and Time-domain reflectometry
    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
    Rights: All rights reserved
    Resource Type: Report
  9. Real Time Monitoring of Infrastructure of Subsidence Along I-70 in Washington, PA

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    Description: Two longwall coalmine panels were mined at a depth of approximately 156 m (510 ft) beneath I-70 east of Washington, Pennsylvania such that it crossed the width of one panel at two locations. The Pennsylvania Department of Transportation (PennDoT) assumed responsibility for real time monitoring of both ground deformation and...
    Keyword: Structural health monitoring
    Creator: David J. Whitlatch , Ronald J. Clark, Charles H. Dowding, and Kevin M. O'Connor
    Owner: Nurganym Agzamova
    Publisher: Northwestern University Libraries
    Language: English
    Date Uploaded: 07/05/2017
    Date Modified: 08/14/2017
    Date Created: 2001
    Rights: All rights reserved
    Resource Type: Report
  10. Geo-Measurements with Metallic TDR Cable Technology for Infrastructure Surveillance

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    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
    Rights: All rights reserved
    Resource Type: Research Paper