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Table A2. Categories of Protection, Polanc <br />(Brauner, 1973) <br />Category Allowable Allowable <br />tilt strain <br />I 0.0025 1500µE <br />(0.143°) <br />I I 0.0050 3000µE <br />(0.286°) <br />Explanation <br />Slight damage allowable, such as hair <br />hair cracks in plaster. <br />Small reparable damage allowable. <br />III 0.0100 6000µE Building damage severe, but does not <br />(0.573°) does not destroy the building or impair <br /> its service. <br />IV 0.0150 9000µE Movements so severe that reinforced <br />(0.859°) structures are required to resist them. <br />Table A3. Tolerance of Structures to Differential Subsidence <br />(Hutchings, et a1,1978) <br />DIFFERENTIAL STRUCTURAL SIGNIFICANCE <br />SUBSIDENCE <br />(Strain - %) <br />0.1 % Limiting value for high continuous brick walls and brick-clad column frames <br />(1000µe) <br />0.1 %-0.2% Single story brick mill building, wall cracking <br />(1000-2000µE) <br />0.2%-0.4% Limiting value for steel and reinforced concrete frames <br />(2000-4000,uE) <br />0.7% Structural damage to buildings <br />(7000,uE) <br />0.8% Slight damage to 2-1/2 story brick veneer homes <br />(8000,uE) <br />2% Severe damage to 2-1/2 story brick veneer <br />(20000,uE) <br />