doktorska disertacija
Jerneja Kolšek (Author), Igor Planinc (Mentor), Matjaž Mikoš (Thesis defence commission member), Sebastjan Bratina (Thesis defence commission member), Franc Kosel (Thesis defence commission member), Tomaž Hozjan (Thesis defence commission member)

Abstract

Požarna analiza dvoslojnih kompozitnih linijskih konstrukcij

Keywords

Grajeno okolje;gradbeništvo;disertacije;kompozitni nosilec;požarna analiza;zdrs;razmik;prenos toplote;prenos vlage;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.08 - Doctoral Dissertation
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [J. Kolšek]
UDC: 614.8:624.016:(043.2)
COBISS: 6222433 Link will open in a new window
Views: 2205
Downloads: 665
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Other data

Secondary language: English
Secondary title: Fire analysis of two-layered composite planar structures
Secondary abstract: Subject of the dissertation is a new numerical model for geometrical and material non–linear fire analysis of steel–concrete two–layered composite beams accounting for longitudinal and transversal partial interlayer interaction. The numerical procedure consists of three mathematically uncoupled phases. For the determination of the time–dependent development of temperatures in the fire compartment standard fire curves are used in the first phase. In the following hygro–thermal phase, coupled heat and moisture transfer in the analysed beam is determined. For the steel layer of the beam Fourier law of heat conduction is employed. In the reinforced concrete layer, the distributions of temperatures, pore pressures, and free water contents are defined by a system of mass and energy conservation equations and considering phenomena such as phase transitions (water evaporation and water vapour condensation), release of chemically bound water, capillary pressure and difussion of adsorbed water. For structures endangered by the concrete spalling phenomenon, the stress-strain state in the beam at room temperature is accounted for in the calculations of the time–dependent permeability of the concrete. The final mechanical part of the fire analysis deals with the time–dependent stress–strain state of the composite beam. The most important novelties of this part of the model are: (i) each of the layers of the composite beam is modelled separately by the kinematically exact planar beam theory of Reissner and the contact constitutive law is described in dependence on the longitudinal and the transversal slips between the layers and on the uplift; (ii) contact constitutive laws are described in an average base established from tangential and normal contact basis vectors; (iii) material non–linear and temperature–dependent behaviour of steel and concrete layers is described using the principle of additivity of strains where viscous creep of steel and creep and transient deformations of concrete are explicitly considered. In the zones of cyclic loading and reloading of the structure, hardening of the material is accounted for by the model of kinematic hardening. In the second part of the dissertation the new proposed model is validated against experimental data and the proposed numerical procedure is proven to be adequate and accurate for the fire analysis of stiffness, ductility, and bearing capacity of an arbitrary beam of this kind. All of the calculations of this as well as of the final part of the dissertation are performed using the computer softwares MoistureHeat2 and CompositeBeam both computed in the computing environment Matlab. An important finding of the verification chapter of the thesis shows that the impacts of the mechanical loading of the beam and the effects of restrained thermal dilatations are to be considered in the hygro-thermal part of the analysis if not only temperature but also pore pressure development is important (i.e. in an analysis
Secondary keywords: Built Environment;civil engineering;doctoral thesis;fire analysis;composite beam;slip;uplift;heat transfer;moisture transfer;
URN: URN:NBN:SI
File type: application/pdf
Type (COBISS): Doctoral dissertation
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo, Doktorski študijski program Grajeno okolje, smer gradbeništvo
Pages: XXVIII, 113 str.
Type (ePrints): thesis
Title (ePrints): Požarna analiza dvoslojnih kompozitnih linijskih konstrukcij
Keywords (ePrints): gradbeništvo;disertacije;kompozitni nosilec;požarna analiza;zdrs;razmik;prenos toplote;prenos vlage;
Keywords (ePrints, secondary language): civil engineering;thesys;fire analysis;composite beam;slip;uplift;heat transfer;moisture transfer;
Keywords (ePrints, secondary language): civil engineering;thesys;fire analysis;composite beam;slip;uplift;heat transfer;moisture transfer;
ID: 8312750