What materials should be used for the columns and roof load-bearing elements in Class A warehouses?
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Table 3.3.2 of the Code for Fire Protection Design of Buildings specifies the fire resistance ratings for Class A warehouses: for items 3 and 4, the fire resistance rating must be Grade 1, while for items 1, 2, 5, and 6, the fire resistance rating can be Grade 1 or Grade 2. According to 4.2.2.2 of the \"Technical Requirements for the Storage and Maintenance of Flammable and Explosive Goods\" (GB17914-2013), liquids with low or medium flash points, Class 1 flammable solids, self-igniting substances, compressed gases, and liquefied gases should be stored in warehouses located in buildings with Class 1 fire resistance. In that case, Class A flammable liquids can only be stored in warehouses with a fire resistance rating of level 1; in other words, for storage of Class A items, a fire resistance rating of level 1 is required. For warehouses with this rating, the columns must have a fire resistance duration of 3 hours. If steel columns are used, they need to be coated with fireproof paint to a thickness of 50 mm, which is not practical. Roof load-bearing members are required to have a fire resistance rating of 1.5 hours; steel beams covered with wire mesh plaster do not meet this requirement either, as a protective layer thickness of 30 mm is insufficient to achieve a 1.5-hour fire resistance period. In that case, the load-bearing elements of the roof can only be made of concrete frames. I wonder how you take into account the fire resistance requirements in the design of Class A warehouses, and how you choose materials for the columns and roof load-bearing elements
Is the forum that deserted these days?:P
Today, many manufacturers of fireproof coatings are able to produce coatings that meet the requirements for a first-class fire resistance rating. The thickness requirements for fireproof coatings in the building code appendices are outdated
Is Grade 1 fire resistance for steel structures acceptable as well?
Sure, I have just completed a primary steel structure project
The fire resistance rating is determined by the fire-resistant materials used; it is possible to use materials with a high fire resistance rating. In addition, a tortoise-shell mesh must also be installed.
How thick does the exterior fireproofing material need to be?
It varies from manufacturer to manufacturer, and the prices are different as well. All are products that have passed testing. Design documents cannot specify a fixed thickness, as that is meaningless given the different properties of various products.
Does that mean the design drawings only specify the fire resistance requirements, leaving it up to the owner to make the choice?
Indicate the fire resistance rating of the building, the required fire resistance limits for various structural components, whether a thick or thin coating is needed, and whether the material is weather-resistant or not. Specify the design requirements clearly; the owner can then make their own choices for the rest