【法规名称】
【法规编号】 79807 什么是编号？
【正 文】
第5页 CAP 123B BUILDING (CONSTRUCTION) REGULATIONS
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[接上页] (d) For factories and workshops designed for a distributed imposed load of 7.5 kPa or more the total imposed load shall not be reduced below that obtained if all the floors had been designed for a distributed imposed load of 7.5 kPa without the reduction specified in Table 2. (e) No reduction of the imposed loads shall be applied with respect to- (i) plant or machinery which is specifically allowed for; or (ii) floors of factories and workshops designed for a distributed imposed load of less than 7.5 kPa; or (iii) floors used by vehicles and floors used for storage purposes; or (iv) office areas used for storage and filing purposes; or (v) forces produced by dynamic effects. TABLE 2 REDUCTIONS OF TOTAL DISTRIBUTED IMPOSED LOADS Number of floors (including the roof) carried by the member under consideration Percentage reduction of total distributed imposed load on load on all floors (including the roof) carried by the member under consideration 1 2 3 4 5 or more 0 10 20 30 40 (3) Protective barriers installed to restrict or control the movement of persons shall be designed to resist the minimum horizontal imposed loads specified in Table 3 when separately applied or the wind load (where applicable), whichever shall produce the more adverse effects. TABLE 3 MINIMUM HORIZONTAL IMPOSED LOADS ON PROTECTIVE BARRIERS TO RESTRICT OR CONTROL THE MOVEMENT OF PERSONS Usage Uniformly distributed load to be applied at a height of 1.1m above floor level Uniformly distributed load applied on the infill between floor and top rail Concentrated load applied on any part of the infill between floor and top rail kN/m run kPa kN Areas where crowd load is not expected 0.75 1.0 0.5 Places of assembly and all panic barriers 3.0 1.5 1.5 (4) (a) Except as provided in paragraphs (b), (c) and (d), vehicle barriers for car parks shall be designed to withstand an impact force of [10M / (100 + db)] kN uniformly distributed over any length of 1.5 m and acting at bumper height, where M is the gross mass of the vehicle in kg and db is the deflection of the barrier in millimetres. (b) Vehicle barriers for car parks which have been designed on the basis that any vehicle using them will not exceed a weight of 2500 kg shall be designed to withstand an impact force of [15000 / (100 + db)] kN uniformly distributed over any length of 1.5 m and acting at 375 mm above the floor level, where db is the deflection of the barrier in millimetres. (c) Vehicle barriers for access ramps of car parks shall be designed to withstand 1/2 of the appropriate impact force determined in accordance with paragraph (a) or (b) acting at a height of 610 mm above the ramp. (d) Opposite the lower end of any straight ramp intended for downward travel which exceeds 20 m in length the vehicle barrier shall be designed to withstand twice the appropriate impact force determined in accordance with paragraph (a) or (b) acting at a height of 610 mm above the ramp. (e) Vehicle barriers in areas other than those covered by paragraphs (a) to (d) shall be designed to withstand the impact force appropriate to the vehicles using such areas. (5) (a) Forces produced by dynamic effects shall be considered as additional imposed loads in the design of buildings, streets, building works and street works. (b) The forces produced by dynamic effects in any workshop, factory or other building for industrial use may be determined on the basis of information about the particular building, but if not so determined shall be presumed- (i) for the purpose only of determining the design of slabs and beams, to be an additional vertical imposed load of 2.5 kPa; and (ii) for the purpose of determining the design of structural frames and foundations, to be an additional horizontal force (which may be assumed not to act together with the wind load) of 10% of the vertical imposed load specified in subparagraph (i) acting simultaneously on the N number of floors which will produce the most adverse effects, where N is a whole number not less than 0.2 times the total number of floors subject to dynamic effects. (Enacted 1990) Cap 123B reg 18 Wind loads The wind load on any building, street, building works or street works shall be based on the response of that building, street, building works or street works to the velocity and gust effect of winds from any direction suitably determined from a return period of not less than 50 years. (Enacted 1990) Cap 123B reg 19 Notice as to load (1) In every storey of every industrial building or warehouse, there shall be exhibited by the owner, at each staircase or at some other appropriate place, permanently and conspicuously, a notice in English and Chinese incised or embossed, of metal, plastic or other suitable material, in letters and figures not less than 15 mm high, stating the distributed imposed load (not including dynamic effects) for which the floor has been designed in terms of weight per square metre, in the following form- |
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