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Silver Spring Transit Center Report


ADDENDUM TO “REPORT OF THE INDEPENDENT ADVISORY COMMITTEE REGARDING THE STATUS OF THE SILVER SPRING TRANSIT CENTER”
 
The following elaboration is provided in response to questions raised regarding aspects of the report cited above:
 
Bottom of page 7 (soffits)
If inspections are properly performed and appropriate repairs made, the likelihood of further failures from this particular cause is considered remote.
 
Bottom of page 5 (shear and torsion)
A failure stemming from combined shear and torsion stresses is likely to be sudden.  The consequence is unlikely to be a major structural collapse but rather will evidence itself by spalling of concrete in the local area.  This could pose a danger from falling concrete spall to individuals within that area.  The existence of cracks from causes unrelated to shear and torsion (some of which are already present) can increase the likelihood of a combined shear and torsion incident, as well as its extent; however, this compounding effect by itself can be minimized or eliminated by pursuing a rigorous inspection and repair protocol.  Notwithstanding the above, the probability of an eventual failure from combined shear and torsion stresses is considered to be not insignificant; however, when such a failure might occur, or over what area, is largely indeterminable, since it is dependent upon such factors as loading history.