Building Separation Joint

Buildings that are large in horizontal extent should be divided into separate structural entities, each of which is compact enough so that it can react as a rigid unit to foundation settlement and other movements, thereby avoiding damage.

1. This drawing shows how building separation joints should be located at points of geometric weakness where cracking would otherwise be likely to occur. Notice how the joints divide the building into compact rectilinear volumes. At each joint plane, the structure of the building is cut completely through, with independent structural support on each side of the joint. Building separation joints arc often referred to as "expansion joints," but they are really intended to separate a large building into a set of smaller buildings so that the building can deal effectively with not only thermal expansion but also soil settlement, materials shrinkage, and seismic deflections. The locations, clear spacing between parts of the building, foundations, structural support, and detailing of building separation joints should be designed in consultation with the structural and foundation engineers so that combinations of thermal and moisture movement, foundation settlement, and the relative seismic motions of the adjoining parts of the building can be dealt with adequately. As a general guide, spacings between building separation joints should not exceed 150 to 200 ft (45 to 60 m).

2. Building separation joints must be covered to keep out the weather and to provide continuity to interior surfaces. This is a typical design for a separation joint cover for a low-slope roof. A flexible bellows keeps water and air from

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  • winta kinfe
    Why separation joint is given in building?
    2 months ago

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