Investigation of the regularities of temperature regime of fire in cable tunnels depending on its parameters

Simulation, as a method of scientific research, makes it possible, without performing costly and labor-intensive field experiments on models, to carry out all necessary experiments to determine the temperature modes of fire in cable tunnels. The purpose of the research of this work was to determine the temperature regime of fire in a cable tunnel depending on its shape, size and fire load. Mathematical models of cable tunnels were created in one of the CFD software systems. Cable products are constantly evolving and improving. For tests on the fire resistance of building structures of cable tunnels, a standard temperature mode of fire is used which may not correspond to fire mode in a real cable tunnel. The computational experiments were carried out and the temperature regimes of fires in tunnels with different parameters were determined. The obtained results showed the parameters of cable tunnels, which influence the temperature regime of fire in tunnels most. In this paper the use of computational experiments for the study of heat and mass transfer processes in fires in cable tunnels was examined further. CFD Fire Dynamics Simulator 6.2 was used.

Download Full-text

Possibilities of modern software complexes in simulation fire protection of constructions structures with Sofistik

MATEC Web of Conferences ◽

10.1051/matecconf/201819303026 ◽

2018 ◽

Vol 193 ◽

pp. 03026 ◽

Cited By ~ 3

Author(s):

Marina Gravit ◽

Vladimir Lyulikov ◽

Alina Fatkullina

Keyword(s):

Fire Resistance ◽

Fire Protection ◽

Software Systems ◽

Building Structures ◽

Temperature Regimes

The review of modern software systems that allow producing modeling and calculation of fire resistance of building structures, as well as simulating fire protection, is given. Particular attention is paid to the software Sofistik, which allows you to synchronize with Autodesk Revit and calculate the fire protection of building structures for various temperature regimes.

Download Full-text

Calculation of fire resistance of building structures in software packages

E3S Web of Conferences ◽

10.1051/e3sconf/20199102007 ◽

2019 ◽

Vol 91 ◽

pp. 02007 ◽

Cited By ~ 1

Author(s):

Ivan Dmitriev ◽

Vladimir Lyulikov ◽

Olga Bazhenova ◽

Dmitry Bayanov

Keyword(s):

Fire Resistance ◽

Fire Regimes ◽

Point Of View ◽

Temperature Fields ◽

Software Systems ◽

Building Structures ◽

The Finite Element Method ◽

Fire Load ◽

Software Packages ◽

Intuitive User Interface

In the article a review of modern software systems allowing calculating the distribution of temperature fields in a structure in time, without loading and with it (the fire resistance limit of structures) under conditions of a special fire load has been given. The algorithm of the finite element method is used for the calculations, on which each of the considered complexes is based. Specifically: Sofistik, Abaqus, Normcad, Ansys, Robot structure. Comparative analysis has been made from the point of view of intuitive user interface, the possibilities of modeling various conditions and fire regimes, tools for communication with other software complexes and the format of output of results. The results demonstrating the capabilities of the post-processor Sofistik have been presented.

Download Full-text

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 ◽

◽

A.V. Pekhotikov ◽

V.V. Pavlov ◽

◽

...

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.

Download Full-text

Modelling wastewater transformation in sewers based on ASM3

Water Science & Technology ◽

10.2166/wst.2002.0093 ◽

2002 ◽

Vol 45 (6) ◽

pp. 51-60 ◽

Cited By ~ 7

Author(s):

J.L. Huisman ◽

W. Gujer

Keyword(s):

Activated Sludge ◽

Field Experiments ◽

Deterministic Model ◽

Model Parameters ◽

Sulphur Hexafluoride ◽

Quality Model ◽

Fast Calculation ◽

Activated Sludge Model ◽

Transfer Processes ◽

Mass Transfer Processes

A deterministic model for wastewater transformations in the sewer that includes activity in the wastewater and in the sewer wall biofilm was developed. It is based on the Activated Sludge Model No. 3 (ASM3). The mass transfer processes in the biofilm were modelled with the effectiveness approach. This approach allowed for fast calculation, required only a limited number of parameters and gave good results. The ASM3 related parameters were calibrated and validated with laboratory experiments. An equation for the aeration of the wastewater through the water surface was determined with a method based on the inert gas sulphur hexafluoride. The other model parameters such as wall roughness, attachment of particles to the biofilm and biofilm erosion were calibrated and validated with field experiments in a main sewer. The resulting model described the oxygen concentration and wastewater respiration well. It can be easily linked for integrated urban hydrology modelling with the WWTP Activated Sludge Model and the newly proposed River Water Quality Model No. 1.

Download Full-text