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Comparison of floor area ratio (FAR) or floor space index (FSI) and building coverage ratio (BCR) Floor area ratio (FAR) is the ratio of a building's total floor area (gross floor area) to the size of the piece of land upon which it is built. It is often used as one of the regulations in city planning along with the building-to-land ratio. [1]
In architecture, the slenderness ratio, or simply slenderness, is an aspect ratio, the quotient between the height and the width of a building. In structural engineering, slenderness is used to calculate the propensity of a column to buckle.
For buildings with one or two floors, h is the height of the building and A is the flow area of the openings. For multi-floor, high-rise buildings, A is the flow area of the openings and h is the distance from the openings at the neutral pressure level (NPL) of the building to either the topmost openings or the lowest openings.
Building codes determine the maximum deflection, usually as a fraction of the span e.g. 1/400 or 1/600. Either the strength limit state (allowable stress) or the serviceability limit state (deflection considerations among others) may govern the minimum dimensions of the member required.
New building regulations that came in force in 2020, limited the height of buildings on cities depending on population in China.Cities with less than 3 million population cannot have structures rising above 250 m (820 ft); cities with populations greater than 3 million can have buildings up to a height of 500 m (1,600 ft).
Hong Kong law Chapter 123F, Building (Planning) Regulations, Regulation 23 sect 3 sub-paragraph (a) defined that: Subject to sub-paragraph (b), for the purposes of regulations 19, 20, 21 and 22, the gross floor area of a building shall be the area contained within the external walls of the building measured at each floor level (including any floor below the level of the ground), together with ...
Use Newton's law of gravitation to calculate the radial altitude of both the ground and the roof. The difference will be the height of the building. Tying a piece of string to the barometer, which is as long as the height of the building, and swinging it like a pendulum, and from the swing period, calculate the pendulum length.
Some building codes also specify a minimum riser height, often 5 inches (127 mm). [37] Riser-Tread formula: Sometimes the stair parameters will be something like riser plus tread equals 17–18 inches (432–457 mm); [38] another formula is 2 times riser + tread equals 24.6 inches (625 mm), the length of a stride. [14]