Abstract
Reconstruction of Pennsylvania Avenue in Washington DC provided a unique opportunity to instrument the historic Blair House to determine its response to construction vibrations. To that end three cracks in the house, two on the interior and one on the exterior were instrumented with a micro-meter crack displacement sensor capable of measuring changes in crack width as small as 0.4 micro meters. This one sensor was employed to measure the micro-meter response of the crack to both dynamic (construction vibration) as well as the long term (weather) effects. As has been found with many other structures, the long term climatological effects produce greater crack response than do construction vibrations at levels that can be perceived and at times can be described as annoying.
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