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- Charles H. Dowding[remove]17
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-
- 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
-
- 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
-
- Description:
- In this paper vibratory crack response is compared to that produced by volumetric changes in foundation soils induced by natural events. These natural phenomena include changes in the water table, changes in soil moisture, and formation of ice lenses to name a few. Previous papers have compared vibratory responses of...
- Keyword:
- Structural health monitoring and Cracking of concrete
- Creator:
- V. Rosenhaim, Catherine Aimone-Martin, 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:
- Research Paper
-
- 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
-
- Description:
- Construction is omnipresent in modern-day America. It's the sound and vibration of a nation scrambling to keep up with its burgeoning population. In most states, allowable construction-induced ground motions range from 0.5 to 1.0 inches per second (in/sec) and under certain conditions up to 2.0 in/sec. However, ground motion as...
- Keyword:
- Structural health monitoring
- 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:
- 2001
- Resource Type:
- Report
-
- Description:
- Mining near the town of Blanford, Indiana for a number of years has led to an opportunity for Peabody Coal Company to study and compare environmental and blast effects. Such a comparison allows description of any blast effects relative to those caused by common environmental changes, which should be familiar...
- Keyword:
- Structural health monitoring
- Creator:
- Charles H. Dowding and Spencer W. Lucole
- Owner:
- Nurganym Agzamova
- Publisher:
- Northwestern University Library
- Language:
- English
- Date Uploaded:
- 07/05/2017
- Date Modified:
- 08/14/2017
- Date Created:
- 1988-01-28
- Resource Type:
- Report
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
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
-
- 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
-
- 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
-
- 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
-
- 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