5607.19.1.2 Maximum allowable global tensile wall strain.
FC § 5607.19.1.2
Unless otherwise authorized by the department, the blast monitoring specialist shall ensure that appropriate equipment is utilized, in accordance with the rules, to enable the calculation of global tensile wall strain after each blast. If peak particle velocity (PPV) limits set forth in FC Table 5607.19.1 are exceeded, then measurements obtained from structure-mounted geophones shall be used to compute global shear wall strain and subsequently the maximum global tensile wall strain over the entire height of the building or structure for each of two perpendicular structure walls closest to the blast. Global tensile wall strain, computed from the maximum time-correlated differential displacement time histories measured between the upper and lower portions of the building or structure, shall not exceed: 1. 25 µ-strains in any one of two conjoined walls closest to the blast for structures consisting of fragile aged interior plaster and other vibration-sensitive materials, and landmark structures; and 2. 50 µ-strains for buildings constructed of modern drywall in or after 1950.
