1. The assesment of pile shaft resistance based on axial strain measurements during the loading testAndrej Štrukelj, Stanislav Škrabl, Ksenija Štern, Janko Logar, 2005, izvirni znanstveni članek Opis: Near Maribor, a new bridge over the Drava river is being under construction. Before the main works actually started, static and dynamic loading tests of piles were performed. The goal of the static loading test was to determine the bearing capacitiy of the test pile. It was also interesting to determine the share of the axial load distributed on the shaft and pile toe. In order to measure the distribution of the axial force along the pile, a specially made steel canal was built in the pile before concreting. Inside this canal the strain gauges were distributed evenly at the distance of one meter. The strains were measured for each loading phase in all measuring points. The distribution of the axial force was assessed from the obtained results and based on the distribution of the axial force the shaft resistance could be determined. The unexpectedly high bearing capacity of the pile shaft made the obtained results highly interesting. In this paper, measuring methods and measuring results are discussed. Behaviour of the pile and the soil during the loading test were also modelled by axial symmetric and three dimensional models. The calculated and measured results show a very good agreement.
Ključne besede: civil engineering, bridges, soil mechanics, pile shaft resistance, loading test, strain measurements, elastoplastic soil modelling, finite element method
Objavljeno v DKUM: 16.05.2018; Ogledov: 1430; Prenosov: 80
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2. Development of courseware modules for engineering mechanics educationBoštjan Harl, Nenad Gubeljak, Marko Kegl, Jožef Predan, 2012, izvirni znanstveni članek Opis: This paper discusses a pilot course introduced in mechanical engineering education. Since computers nowadays can provide enormous benefits in the learning process, it is important to study which techniques are the best for a particular subject. In our model the students still attend the lectures and tutorials, but these conventional techniques are enriched by parallel, fully computerized, homework assignments and virtual laboratory testing. For the purpose of homework assignments, a new software called ASDN was developed. ASDN enables automatic generation of individual homework tasks, their distribution via e-mail and automatic collecting and processing of results. For a better understanding of the numerical tasks, the LAB-3D module was developed, which enables a detailed visualization of prerecorded laboratory tests. These tests comprise the whole testing process, from the visualization of the physical test, to the analysis of the measured data and comparison with numerically obtained results.
Ključne besede: engineering mechanics, e-teaching, e-learning, homework
Objavljeno v DKUM: 10.07.2015; Ogledov: 1400; Prenosov: 109
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3. The advance engineering methods to plan the behaviour of fused panelSimona Jevšnik, Jelka Geršak, Ivan Gubenšek, 2005, izvirni znanstveni članek Opis: The purpose of this paper is to analyse some mechanical properties and parameters of drapability using different methods from two different points of research area: knowledge bases and numerical modelling using the finite element method. The approach consists of analysing some mechanical properties and parameters of drapability using different methods from two different points of research areaČ knowledge bases and numerical modelling using the finite element method. The knowledge bases, named FP_B-1 and FPO_B-2, were used to analyse the bending rigidity of fused panels. The numerical model of fused panel NMFP is used to analyse parameters of drapability. Findings - Based on the analyses of bending rigidity and draping of fused panels the conclusions indicate the significance of interaction between mechanical properties and parameters of drapability of thefused panel to garment appearance. Furthermore, the methods used present a computer approach to the study of the fused panel properties important for thecomputer-based engineering and the presentation of real behaviour of all aspects of clothes. This numerical model of a fused panel enables a 3D observation of this aspect of clothes which is a behaviour, very important contribution to the computer planning of the behaviour of produced clothes. Originality is in a better understanding of how to construct fused panels in clothing.
Ključne besede: clothing engineering, fabric mechanics, fusible interlining, fused panels, drapability, knowledge base, FEM
Objavljeno v DKUM: 01.06.2012; Ogledov: 1931; Prenosov: 110
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4. Evaluation of Green`s function for vertical point-load excitation applied to the surface of a semi-infinite elastic mediumAndrej Štrukelj, Tomaž Pliberšek, Andrej Umek, 2006, izvirni znanstveni članek Opis: The topic of this paper is to show that the integrals of infinite extent representing the surface displacements of a layered half-space loaded by a harmonic, vertical point load can be reduced to integrals with finite integration range. The displacements are first expressed through wave potentials and the Hankel integral transform in the radial coordinate is applied to the governing equations and boundary conditions, leading to the solutions in the transformed domain. After the application of the inverse Hankel transform it is shown that the inversion integrands are symmetric/antimetric in the transformation parameter and that this characteristic is preserved for any number of layers. Based on this fact the infinite inversion integrals are reduced to integrals with finite range by choosing the suitable representation of the Bessel function and use of the fundamental rules of contour integration, permitting simpler analytical or numerical evaluation. A numerical example is presented and the results are compared to those obtained by the CLASSI program.
Ključne besede: civil engineering, soil mechanics, Green`s function, layered half-space, vertical point load
Objavljeno v DKUM: 31.05.2012; Ogledov: 2472; Prenosov: 42
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