A Contribution to Dynamic Characterisation of Ordered Blocky Systems
A Contribution to Dynamic Characterisation of Ordered Blocky Systems
Nina Čeh
In this work, dynamic characterisation of blocky structures is investigated. First, rocking of blocks is investigated. By this model, the behaviour of historical monuments, dry-stones, blocks in nuclear power plants, and masonry structures after the failure of the mortar may be described. Non-linear equations of motion are derived and solved numerically. The exact time of impact is detected and the kinematic contact conditions after the impact are derived. Experimentally obtained energy loss...
Importance of geotechnical cross-section unsaturated zone for landslide occurrence in flysch deposits
Importance of geotechnical cross-section unsaturated zone for landslide occurrence in flysch deposits
Josip Peranić
Factors primary controlling rainfall-induced slope failures are both rainfall characteristics and soil properties. Rainfall causes a transient infiltration process through the unsaturated part of the slope which affects sloping material by increasing the moisture content and pore-water pressure, changing the effective stress and hydro-mechanical properties of the soil. To study the physical process of rainfall infiltration and how it affects the slope stability state, the dependency between...
Linked Interpolation and Strain Invariance in Finite-Element Modelling of Micropolar Continuum
Linked Interpolation and Strain Invariance in Finite-Element Modelling of Micropolar Continuum
Sara Grbčić
At the core of this thesis is an alternative continuum theory called the micropolar (Cosserat) continuum theory, developed in order to describe the phenomena which the classical continuum theory is not able to describe. In this theory, in addition to the displacement eld, there also exists an independent microrotation eld and, in order to completely describe such a material, six material parameters are needed. In the framework of the nite-element method, new nite elements based on the ...
Model for Erosion Intensity and Sediment Production Assessment Based on Erosion Potential Method Modification
Model for Erosion Intensity and Sediment Production Assessment Based on Erosion Potential Method Modification
Nevena Dragičević
Erosion is a physical process, characterised by significant variations in its intensity and frequency all over the world. Erosion varies upon many elements, among which the most significant are climate parameters precipitation and temperature, as well as other parameters such as geology, topography, vegetation cover and anthropogenic influences. The topic of the dissertation is the analysis of erosion intensity and sediment production using Erosion Potential Method also known as Gavrilović...
Modeliranje betona armiranog čeličnim vlaknima
Modeliranje betona armiranog čeličnim vlaknima
Željko Smolčić
U disertaciji je prikazana eksperimentalna i 3D nelinearna numerička analiza betona armiranog čeličnim vlaknima s kukama. Eksperimentalna analiza provedena je savijanjem u tri točke zarezanih greda s različitim volumnim udjelima vlakana do Vf=1.5 %. Da bi se dobila efektivna veza posmično naprezanje-prokliznuće vlakna između vlakna i betona provedena je eksperimentalna analiza čupanja pojedinačnog vlakna iz betona. Numerička analiza betona armiranog vlaknima provedena je na mezo...
Multi-scale damage model of fiber-reinforced concrete with parameter identification
Multi-scale damage model of fiber-reinforced concrete with parameter identification
Tea Rukavina
In this thesis, several approaches for modeling fiber-reinforced composites are proposed. The material under consideration is fiber-reinforced concrete, which is composed of a few constituents: concrete, short steel fibers, and the interface between them. The behavior of concrete is described by a damage model with localized failure, fibers are taken to be linear elastic, and the behavior of the interface is modeled with a bond-slip pull-out law. A multi-scale approach for coupling...
One-dimensional numerical model for layered shallow water flow in highly stratified estuaries
One-dimensional numerical model for layered shallow water flow in highly stratified estuaries
Nino Krvavica
A numerical model for simulating freshwater and seawater flow in highly stratified estuaries was developed and validated. The governing equations for one-dimensional, two-layer, and time-dependant shallow water flow were derived from the laws of conservation of mass and linear momentum. The resulting equations are written as a system of non-linear, hyperbolic, partial differential equations. To solve this system, a finite volume method was used; specifically, a well-balanced...
Razvoj hidrološkog modela otjecanja s malih slivova temeljen na umjetnoj neuronskoj mreži
Razvoj hidrološkog modela otjecanja s malih slivova temeljen na umjetnoj neuronskoj mreži
Ivana Sušanj
U nekim je situacijama štetne pojave, koje su uzrokovane djelovanjem vode, moguće umanjiti ili spriječiti posljedice istih uz pomoć sustava za rano uzbunjivanje pravovremenom obznanom obavijesti o mogućnosti nastanka štetne pojave. Motivacija za izradu ove disertacije temelji se na istraživanju mogućnosti predviđanja štetnih pojava uzrokovanih vodom na malim slivovima u cilju implementacije sustava za rano uzbunjivanje. Istraživanja unutar rada obuhvaćaju uspostavu kontinuiranog...
Utjecaj ponašanja vijčanih priključaka na potresni odziv čeličnih okvira
Utjecaj ponašanja vijčanih priključaka na potresni odziv čeličnih okvira
Paulina Krolo
U doktorskom radu izrađen je matematički model histerezne anvelope priključka s obostrano produljenom čelnom pločom u vijčanoj izvedbi. Model histerezne anvelope razvijen je s ciljem što realnije procjene ponašanja čeličnih okvira u potresu primjenom nelinearne statičke metode. Modelom su definirani omjeri između monotonih svojstava priključaka i svojstava priključaka pri cikličkom deformiranju. Definirani omjeri određeni su kao funkcija dvaju parametara; debljina čelne...
Utjecaj trošenja na rezidualnu posmičnu čvrstoću sitnozrnastih litoloških članova fliša
Utjecaj trošenja na rezidualnu posmičnu čvrstoću sitnozrnastih litoloških članova fliša
Martina Vivoda Prodan
U ovom doktorskom radu prikazani su rezultati istraživanja utjecaja trošenja na rezidualnu posmičnu čvrstoću i postojanost sitnozrnastih litoloških članova flišne stijenske mase na području sjeverne Istre, doline Rječine i Vinodolske doline. Nekompetentni, sitnozrnasti litološki članovi flišnog kompleksa trošenjem značajno mijenjaju fizičko mehaničke značajke. U naslagama fliša cesta je pojava klizišta pri ćemu se klizna ploha formira ili na kontaktu pokrivača i...