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Number of storeys below the level of the primary entrance, otherwise described as the number of basements or basement levels. This does not include the ground floor. If it is known that there are no storeys below ground floor, the number is zero. It includes storage and mechanical plant levels only if these cover over 50% of the plan area.
The number of storeys below ground can be recorded as an exact number, or as a range, or as an approximate number if the exact number is not known. It can also be recorded as unknown.
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Precast concrete slabs (e.g. hollow-core slabs) supported by steel beams.
Metal beams supporting precast concrete slabs, India (S. Brzev)
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It is clear that the structural material of the Lateral Load Resisting System is metal (and is not steel), but the type of metal is unknown. The material may be hidden or coated, or information about it is unavailable.
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The building is used by national or local government, and includes office buildings, and facilities involved in emergency management. Medical and educational facilities are not included in this category.
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A framework of posts and beams where posts are spaced several meters apart. If the posts do not cantilever from the foundations, lateral stability may be supplemented by infill walls or by small diagonal bracing members (knee braces) at post and beam connections that provide some rigidity against horizontal forces. Includes systems comprised of cantilevered posts and trusses with simple pin-jointed connections between them. If most of the seismic resistance is provided by walls or infill walls then the lateral load-resisting system should be described as Wall.
Note that posts and beams include vertically cantilevered posts or columns without rigidly connected beams that would otherwise transform this structural system into a moment frame. If these vertical members have a height to depth or length (measured in the direction they resist horizontal load) less than 3.0 they should be considered as Walls.
