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Type

Work12

Resource type

Report5
Research Paper4
Article1
Other1
Part of Book1

Creator

Charles H. Dowding[remove]12
Kevin M. O'Connor3
Jeffrey E. Meissner2
Dan Marron1
David J. Whitlatch 1
more Creators »

Keyword

Structural health monitoring 4
Autonomous Crack Measurement2
Structural health monitoring2
Time-domain reflectometry 2
Concrete block structure1
more Keywords »

Language

English7
English 1

Publisher

Northwestern University Libraries 4
Northwestern University Libraries 2
Northwestern University Library 2
American Society of Civil Engineers1

Collection

Infrastructure Technology Institute Publications12

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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
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
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
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
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
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
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
Real Time Monitoring of Infrastructure of Subsidence Along I-70 in Washington, PA

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:

Charles H. Dowding, Kevin M. O'Connor, David J. Whitlatch , and Ronald J. Clark

Owner:

Nurganym Agzamova

Publisher:

Northwestern University Libraries

Language:

English

Date Uploaded:

07/05/2017

Date Modified:

08/14/2017

Date Created:

2001

Resource Type:

Report
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
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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