Charles H. Dowding
United States Bureau of Mines
Time domainInstrumentation (computer programming)GeologyEngineeringCivil engineeringSeismologyMining engineeringGeotechnical engineeringMaterials scienceVibrationReflectometryComputer scienceRock mass classificationFracture (geology)Rock blastingDisplacement (vector)CrackingStructural engineeringForensic engineeringRock mechanics
188Publications
20H-index
2,085Citations
Publications 185
Newest
#1Kevin M. O'ConnorH-Index: 7
#2Charles H. Dowding (USBM: United States Bureau of Mines)H-Index: 20
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#1Kevin M. O'ConnorH-Index: 1
#1Kevin M. O'ConnorH-Index: 7
Last. Charles H. DowdingH-Index: 20
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Introduction Basic Physics Monitoring Soil Moisture Field Experience and Verification of Soil Moisture Measurement Monitoring Localized Deformation in Rock Field Experience and Verification of Rock Deformation Measurement Monitoring Soil Deformation Monitoring Structural Deformation Air-Liquid Interfaces Electronics Software Appendices
136 Citations
#1Charles H. Dowding (NU: Northwestern University)H-Index: 20
Last. Essaieb Hamdi (Tunis University)H-Index: 4
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Abstract This paper describes measurement and interpretation of response of two, multiple story, older, urban structures to small charge weight, ultra-high frequency rock blast excitation from contiguous excavation. Time correlated responses were measured at the ends, top and bottom of the structures as well as in the foundation rock below the bottom. Observations based on the ten, instrumented positions during eight blast events provided over seventy time histories for analysis. The case study ...
3 CitationsSource
#1Charles H. Dowding (NU: Northwestern University)H-Index: 20
#2Essaieb Hamdi (Tunis University)H-Index: 4
Last. C. T. Aimone-MartinH-Index: 2
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This paper describes measurement and interpretation of strains induced in two, multiple story, older, urban structures by ultra-high frequency rock blast excitation from contiguous excavation. These strains are obtained from relative displacements found by integrating time correlated velocity time histories from multiple positions on the structures and foundation rock. Observations are based on ten instrumented positions on the structures and in the foundation rock during eight blast events, whi...
6 CitationsSource
#1Charles H. Dowding (NU: Northwestern University)H-Index: 20
#2Mathew P Kotowsky (NU: Northwestern University)H-Index: 2
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This paper describes the details of installation and operation of a commercially available wireless system to measure response of interior cosmetic cracks in a residential structure over a period of a year. Wireless data loggers managed the response of low-power-draw potentiometers that measured micrometer changes in crack width. Systems like those studied herein are useful to describe the performance of any component of a constructed facility that involves existing cracks such as bridges, build...
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AbstractThis paper describes instrumentation and autonomous, Web-enabled remote monitoring of in-service structures to resolve concerns. Structures were subject to dynamic excitation from blasting, construction equipment, and passing trains. An integrated approach to sensing, data acquisition, communication, data aggregation, and display was developed and successfully applied to structures ranging from bridges to homes. Challenges encountered and best practices developed over many multiyear cont...
1 CitationsSource
#1Xuan Sheng Cheng (Lanzhou University of Technology)H-Index: 1
#2Charles H. Dowding (NU: Northwestern University)H-Index: 20
Last. Rui Rui Tian (Lanzhou University of Technology)H-Index: 1
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The objective of this work is to obtain the seismic safety coefficient and fracture surface and proceed with the seismic safety evaluation for the rock mass or soil mass surrounding a tunnel, and the limitation of evaluating seismic stability is considered using the pseudo-static strength reduction. By using the finite element software ANSYS and the strength reduction method, new methods of seismic safety evaluation for the rock mass or soil mass surrounding a tunnel are put forward, such as the...
7 CitationsSource
#1Charles H. DowdingH-Index: 20
Last. P Abeel
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Establishment of the fragility of historic structures near rights of way often produces costly delays in construction. Autonomous Crack Measurement (ACM) of micro meter response of cracks can be employed to assess the potential for adjacent construction activities to cause cosmetic cracking in both historic and non-historic structures. ACM measurement of micro meter crack width changes caused by long term climatological and vibratory roller compaction adjacent to an adobe (native mud brick) stru...
#1Charles H. Dowding (NU: Northwestern University)H-Index: 20
#2P Abeel (NU: Northwestern University)
This paper compares more than two years of micro meter crack displacement response and structural velocity response of a wood frame house adjacent to an operating aggregate quarry. The same transducers that monitor long term, climatologically induced micro inch crack response also measure dynamic responses induced by blast-induced ground motions, occupant activities and wind gusts. The two story house has been expanded several times, is founded on an irregular basement, framed in wood and clad w...
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#1Xuansheng Cheng (Lanzhou University of Technology)H-Index: 1
#2Weiwei Xu (Lanzhou University of Technology)H-Index: 2
Last. Charles H. Dowding (NU: Northwestern University)H-Index: 20
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Abstract In this study, the seismic response of the fluid–structure interaction (FSI) of an undersea tunnel in a broken fault zone during a bidirectional earthquake is examined. An undersea tunnel FSI model that accounts for the effects of the viscoelastic artificial boundary, seepage, and dynamic liquid pressure, and considers the rock mass as a saturated porous medium, is created through finite element analysis software ADINA. The seismic response of the undersea tunnel is determined by consid...
23 CitationsSource