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<br />.~. <br />~:. <br />~- <br />1 <br />~_ <br />~ .- <br />i_ <br />1 I. <br />(~ <br />'I <br />r- <br />~:-- <br />i <br />i <br />• <br />-43- <br />TABLE - SUBSIDENCE DAMAGE DESCRIPTION FOR HORIZONTAL STRAIN <br />Class of damage Change of ]ength Description of typical <br /> of structure damage <br />Very slight Up to 0.1 ft Hair cracks in plaster. Perhaps iso- <br />or negligib]e laced slight fracture in the building, <br /> not visible on outside. <br />Example: 50-ft Tong building <br />extended 50 u - in./in. <br />Slight 0.1 ft-0.2 ft Several slight fractures showing inside <br /> the building. Doors and windows may <br /> stick slightly. Repairs to decoration <br /> probably necessary. <br />Example: 110-ft l ong building <br />extended 1,600 u - in./in. <br />Appreciable 0.2 ft-0.4 ft Slight fractures showing on outside of <br /> building (or one main fracture). Doors <br /> and windows sticking; service pipes may <br /> fracture. <br />Example: 90 ft lo ng building <br />extended 3,700 u - in./in. <br />Severe 0.4 ft-0.6 ft Service pipes disrupted. Open fractures <br /> requiring rebonding and allaying weather <br /> into the structure. Window and door <br /> frames distorted; floors sloping notice- <br /> ably. Same loss of bearing in beams. If <br /> compressive damage, overiappirtq of roof <br /> joints and lifting of brickwork with open <br /> horizontal fractures. <br />Example: 220 ft l ong apartment <br />house un der compression 2,300 u - in./in. <br />Very severe More than 0.6 ft As above, but worse, and requiring partial <br /> or canplete rebuilding. Roof and floor <br /> beams lase bearing and walls lean badly <br /> and need shoring up. Windows broken with <br /> distortion. Severe slopes on floors. If <br /> compressive damage, severe buckling and <br /> bulging of the roofs and walls. <br />Example: 180 ft long apartment <br />house with extertsiort <br />of 6,000 u - in./in. <br />