Computer modelling of fire resistant solutions for structures in high-rise buildings with using of new fire-retardant materials

The article describes possibilities of computer modeling of fire resistance for structures in high-rise buildings, which include new fire-resistant plaster compositions. As an example of program complex, “Sofistik” (Germany) was chosen for the calculation of reinforced concrete structures of tier buildings. The characteristics of fire protection compounds and their regulation, which are usually used, also are shown. According to the new code “Highrise buildings and complexes. Fire safety requirements”, limits of fire resistance for walls of not less than 240 minutes. Skyscraper “Lakhta center” with a height of 462 m and limits of fire resistance of load-bearing reinforced concrete structures 180 and 240 minutes is built up in Russia. The article investigates the means of fire protection in the business center. Moreover, modern form of cladding in Mada Residences building (Dubai, UAE) is concerned to make some conclusions about future fire resistant solutions.

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Fire Protection of Steel and Reinforced Concrete Structures of Industrial Buildings and Structures

Occupational Safety in Industry ◽

10.24000/0409-2961-2021-9-50-56 ◽

2021 ◽

pp. 50-56

Author(s):

V.I. Golovanov ◽

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A.V. Pekhotikov ◽

V.V. Pavlov ◽

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...

Keyword(s):

Reinforced Concrete ◽

Fire Resistance ◽

Fire Protection ◽

Temperature Regime ◽

Fire Retardant ◽

Steel Structures ◽

Reinforced Concrete Structures ◽

Building Structures ◽

Industrial Buildings ◽

Temperature Regimes

Variants of progressive solutions for the use of efficient fire protection means for steel and reinforced concrete structures of the industrial buildings and structures are considered for the purpose of increasing the actual fire resistance and ensuring the requirements of fire safety norms. Distinctive features of the temperature regimes in the initial phase of a real fire from a standard fire were established when assessing the fire resistance of building structures. It is proposed to use such standardized temperature regimes of fire for assessing the fire resistance of building structures, as standard — in the industrial buildings; temperature regime of hydrocarbons combustion — for oil and gas, petrochemical enterprises, offshore stationary platforms; tunnel temperature regime — in the road and railway tunnels. Considering the operating conditions and performance of work on fire protection, the degree of aggressiveness of the environment, the structural and methodological scheme was developed for selecting passive fire protection for steel structures. Recommendations are given on limiting the use of intumescent paints for load-bearing steel structures involved in the overall stability of buildings, with the required fire resistance limit of no more than 30 minutes. To calculate the temperature over the section of the structure during its heating, the dependences of the change in the coefficients of thermal conductivity and heat capacity of fire-retardant linings under fire were obtained. Experimental studies were conducted related to the fire resistance of reinforced concrete floor slabs and slabs with an external reinforcement system based on the carbon composite material with various types of fire-retardant materials. The issue of protecting the lining blocks of road and railway tunnels from brittle (explosive) destruction of concrete in a fire is considered. It is experimentally confirmed that the addition of polypropylene fibers to the concrete mixture replaces the use of fire protection for the tunnels enclosing structures.

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Increase of Temperature and Fire Resistance for Reinforced-Concrete Structures by Surface Treatment with Protective Coating

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.788.36 ◽

2018 ◽

Vol 788 ◽

pp. 36-44

Author(s):

Liudmyla Demydchuk ◽

Dmytro Sapozhnyk

Keyword(s):

Reinforced Concrete ◽

Fire Resistance ◽

Protective Coating ◽

Concrete Structures ◽

Fire Retardant ◽

Reinforced Concrete Structures ◽

Building Structures ◽

Fire Tests ◽

Normative Documents ◽

Concrete Building

The normative documents of Ukraine (DBN V.1.1.7 ̶ 2016) [1] establish that the limit of fire resistance of reinforced-concrete building structures is determined by the calculation method or by fire tests, and shall be at least 45 minutes. Taking into account the modern construction technologies, namely, the reduction of the section of the main building reinforced-concrete structures, it is expedient to use fire-retardant coatings to provide the necessary fire resistance limit.

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Increase of fire resistance of reinforced concrete structures with polypropylene microfiber

MATEC Web of Conferences ◽

10.1051/matecconf/201824503005 ◽

2018 ◽

Vol 245 ◽

pp. 03005 ◽

Cited By ~ 1

Author(s):

Marina Gravit ◽

Elena Golub

Keyword(s):

Reinforced Concrete ◽

Fire Resistance ◽

Concrete Structures ◽

Point Of View ◽

Reinforced Concrete Structures ◽

Fibrous Materials ◽

Reinforced Concrete Structure ◽

Explosive Spalling ◽

High Rise ◽

Concrete Mix

The increase in the construction of high-rise, technically complex buildings and structures is a prerequisite for the widespread use of structures of heavy concrete. In this work, a special type of destruction of this type of concrete is considered in the fire action explosive spalling. One method of protection is polypropylene microfiber, the objective of which is to increase the fire resistance of concrete and reinforced concrete structures. The fire resistance tests of the reinforced concrete structure with the use of microfiber and without it have been carried out. It is shown that polypropylene microfiber can completely prevent explosive spelling of concrete. In addition, the introduction of additives in the form of fibrous materials into the concrete mix is the most optimal from the point of view of labor intensity and material costs.

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