Определение степени огнестойкости и материал перекрытий (Мифы и заблуждения пожарного дела)

#Fire #Tactics #Construction As you probably guessed from the title, we'll discuss how to determine a building's fire resistance rating based on the material used for its floors. The prevailing opinion is that if a building's floors are made of reinforced concrete, it has a fire resistance rating of at least 2, and conversely, if the floors are wooden, it has a fire resistance rating of 3 or lower. Is this true? Let's find out. 00:48 Let's turn to the main regulatory document in the field of fire safety in Russia, namely Federal Law No. 123 of July 22, 2008, "Technical Regulations on Fire Safety Requirements," commonly referred to simply as the Technical Regulations. 01:05 This document describes the procedure for classifying buildings into different fire resistance ratings. We'll need Table No. 21 from the Appendix to the Technical Regulations, which is called: 01:18 We see that the rows of this table list the fire resistance levels, while the columns indicate the minimum permissible fire resistance limits of building structures for each fire resistance level. 01:43 Limit States of Building Structures So, given what's written in this table, as applied to our question, we can draw the following conclusions: 02:14 1st - Fire resistance levels 2 and 3 do not differ in the fire resistance limit of the floors! 02:35 2nd - Fire resistance levels are determined not only by the floors, but also by other structures! 03:15 3rd - The fire resistance level of building structures cannot be determined solely by the building materials from which they are made! 04:24 Thus, it is obvious that it is impossible to determine the fire resistance rating based solely on the floor material! This is a misconception! 05:08 The original source of the misconception. In our case, the source of the misunderstanding was SNiP 2.01.02-85* "Fire Safety Standards," adopted, as can be seen from the index, back in the Soviet Union. Appendix No. 2 to this SNiP contains a table entitled "Approximate Structural Characteristics of Buildings Depending on Their Fire Resistance Rating." You can access it by following the link below the video. It was in this table that it was stated that: For floors of buildings with a fire resistance rating of 3rd degree, the use of wooden structures protected with plaster or fire-resistant sheet and slab materials is permitted. 06:18 However, this SNiP was long ago repealed. Moreover, the requirements set forth in it are fundamentally different from existing ones. Therefore, it cannot be cited as a regulatory document. --------- Even more information about fires, firefighters, and fire safety on the wiki-fire website: https://goo.gl/R1Zajj VKontakte Group: https://goo.gl/59T5XY Fire resistance ratings on the wiki-fire website: https://goo.gl/ShVGCC --------- Regulatory sources: Federal Law of June 22, 2008, No. 123-FZ, Technical Regulations on Fire Safety Requirements: http://base.consultant.ru/cons/cgi/on... SNiP 2.01.02-85*, Fire Safety Standards: http://files.stroyinf.ru/Data1/1/1885/