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Browsing by Author "Laefer, Debra F."

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America's Research-Active, Geotechnical Faculty Members: An Investigation of National Science Foundation Funding Trends

Laefer, Debra F. ; Akter, S. ; McHale, C. (ASCE, 2011-03-13)

This paper is an investigation of the National Science Foundation (NSF) funding trends within America’s research-active tenured and tenure-track, civil engineering community from 50 major, doctoral-granting institutions, ...
America’s research-active, geotechnical faculty members – a snapshot of the community

Laefer, Debra F. ; McHale, C. (2010-02)

This paper is a snapshot in time of the personal backgrounds, educational training, professional ranking, and productivity levels of those individuals with respect to Compendex-listed journal paper. Important questions are ...
Application of the Wavelet Multi-resolution Analysis and Hilbert transform for the prediction of gear tooth defects

Djebala, A. ; Ouelaa, N. ; Benchaabane, C. ; Laefer, Debra F. (Springer Verlag, 2012-10-01)

In machine defect detection, namely those of gears, the major problem is isolating the defect signature from the measured signal, especially where there is significant background noise or multiple machine components. This ...
Assessment and code considerations for the combined effect of seismic base-isolation and viscoelastic dampers

Erkal, Aykut ; Tezcan, Semih S. ; Laefer, Debra F. (Hindawi Publishing Corporation, 2011)

To propose an initial formulation for the passive control section of the Turkish Earthquake Code, the impact of base isolation and viscoelastic dampers on a four-story reinforced concrete (RC) frame building was considered ...
Assessment of excavation-induced building damage

Laefer, Debra F. ; Cording, Edward J. ; Long, James L. ; Son, Moorak ; Ghahreman, Bidjan (American Society of Civil Engineers, 2010-08)

Ground movements during excavation have the potential for major impact on nearby buildings, utilities and streets. Increasingly ground movements are controlled at the source. They are assessed by linking the ground loss ...
Blast-induced liquefaction : a probable field case

Laefer, Debra F. ; Green, J. ; Roberts, K. (2008-12)

Increasingly, industrial operations adjoin residential communities. As the demand for natural resources increases, this problem is only more likely to exacerbate in coming decades. Thus, it is imperative to fully understand ...
Building reuse assessment for sustainable urban reconstruction

Laefer, Debra F. ; Manke, Jonathan P. (American Society of Civil Engineering (ASCE), 2008-03)

Building reuse is a linchpin to managing solid waste. Despite the various benefits beyond contributing to sustainability that can be realized through building reuse, including direct and indirect cost savings, truncated ...
Challenges and solutions to model-scale testing for composite deep foundations and existing foundation enhancement

Laefer, Debra F. ; Manke, Jonathan P. ; Tucker, Jason E. ; Batten, Yuri (American Society of Civil Engineering (ASCE), 2007)

Laboratory testing for foundation design offers advantages over field-testing, especially, where existing installations preclude easy accessibility. Advantages include a homogeneous soil, ability to place instrumentation ...
Combining an Angle Criterion with Voxelization and the Flying Voxel Method in Reconstructing Building Models from LiDAR Data

Truong-Hong, Linh ; Laefer, Debra F. ; Hinks, Tommy ; Carr, Hamish (Wiley-Blackwell, 2013-02)

Traditional documentation capabilities of laser scanning technology can be further exploited for urban modeling through the transformation of resulting point clouds into solid models compatible for computational analysis. ...
Cost-effective decision making for blast mitigation

Princehorn, Molly ; Laefer, Debra F. (American Society of Civil Engineers, 2005-04)

Since the September 11, 2001 terrorist attacks in the United States (U.S.), there has been a marked increase in both public and private sector demand for increased blast-mitigation for existing buildings. To adequately ...
Determining minimum data input levels for reliable three-dimensional soil profiling

Laefer, Debra F. ; O'Neill, James ; Williams, Derek (American Society of Civil Engineering (ASCE), 2009-03)

The ultimate goal of the project reported herein was to determine whether or not a readily quantifiable threshold data density could be established to accurately predict subsurface lithology. A study area in Dublin Ireland ...
Dewatering induced settlement of a historic landmark

Laefer, Debra F. ; Frazier, Jon ; Evans, Ashely (ASV Publishers, 2003-09)

Construction related dewatering in urban areas often induces damage of existing structures. The following forensic investigation highlights the complexities of such a phenomenon. Somerset plantation, a national historic ...
Dynamic analysis of a beam resting on an elastic half-space with inertial properties

Laefer, Debra F. ; Guenfoud, S. ; Bosakov, S. V. (Elsevier, 2009-08)

This work gives a semi-analytical approach for the dynamic analysis of beams and plates rest-ing on an elastic half-space with inertial properties. Such calculations have been associated with significant mathematical ...
Emergence, development, and prevalence of brick nogging in American vernacular architecture

Laefer, Debra F. (Taylor and Francis, 2004-11)

Despite being considered one of many seventeenth century American wall insulation systems, brick nogging emerges as a prevalent construction type throughout all of original colonies. Used in both framed and hewn-log ...
Engineering properties of historic brick – variability considerations as a function of stationary versus nonstationary kiln type

Laefer, Debra F. ; Boggs, Justin ; Cooper, Nicole (American Institute of Conservators, 2004)

Brick produced prior to the mid-twentieth century exhibit high levels of variability in appearance, geometry, and mechanical properties. Understanding historic brick variability is important for accurate performance ...
Evacuation route selection based on tree-based hazards using LiDar and GIS

Laefer, Debra F. ; Pradhan, Anu (American Society of Civil Engineering (ASCE), 2006-04)

Falling trees pose a great hazard to the safe and uninterrupted use of the road transportation system, during storm events. The present process of manually identifying potentially hazardous trees is laborious and inefficient. ...
Expansive cements and soundless chemical demolition agents : state of technology review

Huynh, Minh-Phuoc ; Laefer, Debra F. (2009-10)

Expansive cements and soundless chemical demolition agents (SCDAs) were first introduced in the early 1970s but failed to gain widespread adoption for selective removal of rock and concrete due to their proprietary nature ...
Expansive fracture agent behaviour for concrete cracking

Laefer, Debra F. ; Ceribasi, Seyit ; Wortman, John ; Abrozevitch-Cooper, Nicole ; Huynh, Minh-Phuoc ; Midgette, J. (Institution of Civil Engineers/Thomas Telford Publishing, 2010-06)

Increasing concerns regarding litigation and terrorism provide a strong dual motivation to decrease high explosives usage in the construction industry. This paper provides parameter considerations and initial guidelines ...
Experimental investigation of grouted helical piers for use in foundation rehabilitation

Bian, Yueying ; Hutchinson, Tara C. (Tara Crystal) ; Wilson, Dan ; Laefer, Debra F. ; Brandenberg, Scott (American Society of Civil Engineering (ASCE), 2008-09)

Building rehabilitation is critical for numerous older urban areas, many of which have inadequate foundations to support new demands. Consequently, development of practical methods to strengthen existing foundations is ...
Experimental investigation of grouted helical piers for use in foundation rehabilitation

Bian, Yueying ; Hutchinson, Tara C. (Tara Crystal) ; Wilson, Dan ; Laefer, Debra F. ; Brandenberg, Scott (2007-06)

Building rehabilitation is critical for numerous older urban areas, many of which have inadequate foundations to support new demands. Consequently, development of practical methods to strengthen existing foundations is ...