Index Catalog // Arch : Northwestern University Institutional Repository

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

Comparison of Micro-inch In-Plane and Out-of-Plane Response of Cracks to Blast Vibration and Weather

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:: Charles H. Dowding, Mike J. Waldron, and Jeffrey E. Meissner
Owner:: Chris Diaz
Date Uploaded:: 08/14/2017
Date Modified:: 08/14/2017
Date Created:: 2010
Resource Type:: Research Paper

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 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

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

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

2008-2009 Report: Test House in Franklin, WI

Description:: Cosmetic and structural cracks are a large concern for homeowners. Although these cracks can develop from a variety of causes: differential foundation settlement, occupant activity, climatological effects, as well as dynamic events, people tend to look to dynamic events like blasting, construction, or traffic vibrations to be the culprit. This...
Keyword:: Crack responses , Structural integrity assessment , and Ground motions
Creator:: Jeffrey Meissner and Charles H. Dowding
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2009
Resource Type:: Report

Response of Concrete Block Structure to Quarry Induced Ground Motion and Weather

Description:: The notion of blasting, even in a controlled setting such as a limestone quarry, can be alarming to residents and business owners within earshot. Because humans are inherently sensitive to blast-induced vibrations, they perceive that the structures in which they live in are equally sensitive. The goal of this project...
Keyword:: Ground motion, Concrete block structure, and Structural health monitoring
Creator:: Charles H. Dowding and Jeffrey E. Meissner
Owner:: Nurganym Agzamova
Publisher:: Northwestern University Libraries
Language:: English
Date Uploaded:: 07/05/2017
Date Modified:: 08/14/2017
Date Created:: 2009
Resource Type:: Report

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

Response of Cracks to Construction Vibrations and Environmental Effects

Comparison of Micro-inch In-Plane and Out-of-Plane Response of Cracks to Blast Vibration and Weather

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

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

Geo-Measurements with Metallic TDR Cable Technology for Infrastructure Surveillance

Potentiometers for Measuring Micro-inch Crack Displacements with Wireless Systems

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

2008-2009 Report: Test House in Franklin, WI

Response of Concrete Block Structure to Quarry Induced Ground Motion and Weather

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