The Design and Construction of Electronic Deflection Gauges to Measure the Movement of Floor Assemblies in a Fire

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TypeTechnical Report
Series titleResearch Report, NRC Institute for Research in Construction; Issue 202
Physical description7 p.
Subjectassemblies in a fire; Fire
AbstractThe purpose of this apparatus is to measure the distance that a typical house floor assembly deflects during a fire. The floor structure weakens as it sags with a fire beneath it. It is important to know how much deflection to expect before structural failure occurs. This can be related to the time allowed to safely egress the building. Deflection is the movement of a structure from a fixed position resulting from stress. In this application, the floor assembly is deflected from its fixed horizontal position as a result of stress from the fire beneath it. Deflection gauges were constructed to measure the distance the floor was deflecting from the fixed horizontal plane located on the floor above the test floor. The method for constructing a deflection gauge is described in this report as well as the electrical circuit used for the measurement, the calibration procedure, and the test results from an actual fire.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number17628
NPARC number20377913
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Record identifier0c4c4ffb-827c-476a-ab60-bb0af82a7c92
Record created2012-07-24
Record modified2016-10-03
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