Рассмотрен конструктивный метод огнезащиты стальных несущих конструкций плитами PYRO-SAFE AESTUVER T и особенности расчета предела огнестойкости стальных стержневых элементов с целью обеспечения нормативных требований по огнестойкости. Получены расчетные теплофизические характеристики материалов, на основании которых рассчитаны номограммы - огнестойкости стальных конструкций с данными облицовками. Показано, что эти номограммы в сочетании с представленным ниже расчетным методом можно использовать для оценки огнестойкости стальных конструкций любой конфигурации при различных толщинах облицовки из плит PYRO-SAFE AESTUVER T; для решения обратных задач - поиска минимальной толщины плит PYRO-SAFE AESTUVER T для обеспечения заданного предела огнестойкости и поиска минимальной приведенной толщины металла конструкции для обеспечения заданного предела огнестойкости; для проектирования пассивных противопожарных систем на строительных объектах. Отмечено, что в сочетании с расчетным методом использование этих номограмм позволит сократить расходы огнезащитного материала при устройстве облицовки и тем самым повысить экономическую эффективность огнезащиты данного типа.
Providing required (statutory) parameters of fire resistance of R 60-R 180 steel beam structures involved in ensuring the overall sustainability of buildings and structures is not possible without the use of structural fire protection. Widespread method of structural fire protection involves the use of plate materials. The use of this type of fire protection allows for the production of works without the use of “wet processes”, which is very important for the Far North with a short period of time of positive temperatures. Fire-retardant treatment of steel structures with plate materials may also be carried out without stopping the production process in the reconstruction of buildings and structures. One of the members of the group of fire retardant materials are slabs PYRO-SAFE AESTUVER T, whose composition as a filler includes perlite, glass fiber, and as a binder - cement. The article describes current research aimed at obtaining baseline data to determine fire retardant efficiency of slabs PYRO-SAFE AESTUVER T and features of the calculation of fire resistance of coated steel rod elements in order to ensure regulatory requirements for fire resistance. The studies of fire resistance performance of coatings for steel structures allowed us to obtain the variation of thermal conductivity and heat capacity of fire retardant material, when impacted by fire. To obtain these dependencies, fire tests of steel-lined columns were conducted on the bench equipment for fire tests of building structures on the experimental base of VNIIPO of Emercom of Russia (All-Russian Research Institute for Fire Protection of Ministry of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters). Parameters of cladding, such as density, humidity, emissivity, thermal conductivity and thermal capacity under normal conditions were taken from reference literature. Then, in the presence of experimental data, thermo-physical characteristics (thermal conductivity and heat capacity) of the material at elevated temperatures were calculated with a computer program by solving the inverse heat conduction problem. The obtained parameters of the thermal characteristics for a given flame retardants, allowed to construct warm-up nomograms of unlimited steel plates, depending on the thickness of the steel and the thickness of cladding with PYRO-SAFE AESTUVER T slabs. As a result of the research, the obtained nomograms of fire resistance of steel structures with PYRO-SAFE AESTUVER T fire protection plates may be used for the design of passive fire protection systems at construction sites. In combination with the calculation method, these nomograms allow to reduce the usage of fire-retardant material in cladding thereby increasing the economic efficiency of fire protection of this type. In Federal State Budgetary Establishment VNIIPO the “Instruction on the calculation of the actual limit of fire resistance of steel structures with fire-retardant frameless facings made of PYRO-SAFE AESTUVER T slabs” was developed.
The authors declare that there are no conflicts of interest present.