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Review of the content of the previous issue [building fire prevention] dry goods test site for building height calculation! Today’s sharing content: Calculation of building floors, fire resistance limit and combustion performance of building components, with oral formula memory! Test site summary z19.
Calculation of building floors (★) is generally calculated according to natural floors, but it is not included in the number of floors (1) Basement or semi basement with the height of indoor top plate ≤ 1.5m higher than the outdoor design ground; bicycle garage, storage room and open space set at the bottom of the building with the indoor height ≤ 2.2m (2) local equipment room protruding on the building roof, staircase out of the roof, etc.
(shaved head) z20.
Fire resistance and combustion performance of building components (★★) Fire resistance rating of building components: class I, class II, class III and class IV firewall 3.00 load-bearing components, load-bearing wall 3.002 502.00 0.50 column beam 2.001 501.00 difficult 0.50 floor 1.501 000.50 [0.75] Kenan [0.50] roof bearing member 1.501 00 can be 0.50 difficult [0.50] can be non load-bearing components, the wall between residential building units and household wall, the wall of staircase and front room, and the wall of elevator shaft 2.001 50 difficult 0.50 non load bearing exterior wall 1.00 [0.75] 1.00 [0.50] 0.50 difficult [0.50] can be difficult [0.25] room partition 0.750 50 difficult 0.50 difficult 0.25 ceiling (including ceiling grid) 0.25 difficult, 0.25 difficult, 0.15 evacuable stairs 1.501.000.50 [0.75] partition walls on both sides of evacuable walkway 1.000.50 difficult, 0.25 description 1.
[] is an industrial building 2.
The fire resistance of building components is based on the fire resistance limit of the floor 3.
Formula for combustion performance: class I is completely incombustible, class II ceiling is difficult, class III partition lifting is difficult, and the roof is combustible 4.
Combustion is not indicated before the fire resistance limit in the table Burning performance, which are “incombustible” consolidation exercise 1 A construction company has built a high-rise building.
In the fire prevention inspection of the building, it is necessary to check the number of floors and verify the building classification.
The number of building floors is determined according to the number of natural floors of the building.
When checking the number of building floors, The cases that can not be included in the number of building floors are ().
A.
local equipment room protruding on the roof of the building B.
bicycle garage, storage room and open space with an indoor height of no more than 2.2m set at the bottom of the building C.
staircase out of the roof on the roof of the building D.
the height of the roof surface of the basement of the building above the outdoor design ground is no more than 1.5me.
The height of the roof surface of the semi basement of the building above the outdoor design ground is no more than 1.8m a Click the blank space below to get the answer ABCD [analysis] the basement and semi basement with the height of the indoor top plate not more than 1.5m higher than the outdoor design ground, the self-propelled garage, storage room and open space with the indoor height not more than 2.2m set at the bottom of the building, as well as the local equipment room protruding on the building roof and the staircase out of the roof, are not included in the building floors.
2.
The following materials are non combustible materials ().
A.
gypsum board B.
asphalt concrete C.
concrete D.
particleboard answer click the blank space below to get the answer B [analysis] gypsum board belongs to class A; concrete belongs to class A; particleboard belongs to class B2.
Note that cement particleboard is Class B1.
3.
If the combustion performance grade of a building material is marked as gb8624b1 (b-s1, d0, T1), the smoke toxicity grade of the building material is ().
A.
B1 ， B.
S1C.
D0 ， D.
T1 answer click the space below to get the answer d [analysis] example: gb8624b1 (b-s1, d0, T1) indicates that it belongs to Class B1 fire-resistant building materials and products.
The combustion performance is classified as class B, the smoke production characteristic is classified as class S1, the combustion droplets / particles are classified as class d0, and the smoke toxicity is classified as class T1.
The above is today’s content.
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