Critical Infrastructure Group Research Collection [223]

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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 ...
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 ...
Semi-analytical determination of natural frequencies and mode shapes of multi-span bridge decks

Rezaiguia, Abdelouahab ; Laefer, Debra F. (Elsevier, 2009-12)

The determination of the natural frequencies and mode shapes of structures requires an analytical, semi-analytical or numerical method. This paper presents a new semi-analytical approach to determine natural frequencies ...
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 ...
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 ...