Addendum I: Direct Measurement of Crack Response of Four OSM Study StructuresPublic Deposited
This appendix synthesizes micrometer changes in crack width in response to both long term (environmental) and transient (blast vibration) of four of the structures in the main body. The appendix begins with a description of the genesis of the study and instruments employed. Response of the distressed wood-framed structure in Indiana is then employed to describe a typical suite of measurements. Long term crack response over periods of days to weeks is compared to changes in the temperature and humidity. Transient crack response to blast and occupant induced motions is then compared to peak velocity ground motions and structural response (the traditional approaches to investigation of cracking potential). Finally, the transient and long term changes in crack width are compared.
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