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Journal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.3, No. 45)

Publication Date:

Authors : ; ; ; ;

Page : 277-283

Keywords : fire test; fire resistance; fire resistance class; FDTD method; insulating ability; thermal conductivity; heat capacity.;

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The paper presents a methodology for evaluating the fire resistance of non-bearing walls. A methodology of calculation methods boundaries fire based on FDTD method using the example of fire resistance evaluation outer wall is created. The requirements for the initial data base for materials, boundary conditions, construction of settlement schemes and grid models, but also by criteria framework for identifying the limiting conditions of loss of insulation capacity and loss of integrity on the results of calculation are developed. The estimated fire resistance rating is more effective. The alternative calculation methods, which are lower cost, complexity, does not require expensive and cumbersome experimental equipment. The technique is based on the standards harmonized with appropriate methodological and regulatory framework of the European Union. To estimate the fire resistance is analyzed a wall of ceramic bricks that is built on the edges of the slab. The impact of fire on the wall can be seen as unilateral thermal effects on infinite plate with a given thickness. To solve the heat conduction equation temperature dependence of thermal characteristics of materials according to the Eurocodes is used. For the calculation wall mesh reinforcement models were constructed. Work fragment in the whole wall is taken into account by setting the boundary conditions of symmetry on its sides. The temperature distribution on the section of the wall at different time station of thermal fire effect is received. Signs of integrity loss are difficult to control according to the calculated data, so circumstantial evidences are used. These characteristics include the possibility of brittle fracture. The walls of ceramic bricks are not regulated by current standards of integrity calculation. The most dangerous place in the masonry of ceramic bricks is brick joint. The condition of the bearing capacity of storage is the storage integrity of joints. Analyzing the data, we can see that the temperature on the boundary walls and insulation cover over the control time 150 min value reaches 140 °C. This makes it possible to assert that class of fire resistance of the outer wall is not less than EI 150, outer wall conforms to the standards of fire walls and type. To ensure the appropriate class of fire resistance of external walls and elements of its reference node fireproof system design is required. The criteria for assessing fire stone walls set on calculated data when identifying the limiting conditions of loss of insulation capacity and integrity.

Last modified: 2016-07-26 15:33:00