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Slip modeling in timber-framed walls with wood-based or fibre-plaster sheathing boards
Miroslav Premrov, Peter Dobrila, Branko Bedenik, Igor Špacapan, 2007, izvirni znanstveni članek

Opis: The paper provides mathematical modelling for prefabricated timber-framed walls composed of a timber frame and two different types of sheathing boards. Since by wood-based boards (WBB) the tensile strength is similar to the compressive one, there are practically no cracks appearing in the boards. On the other hand, in case of fibre-plaster sheathing boards (FPB) the tensile strength is approximately 10-times lower than the compressive one and therefore cracks in the tensile diagonal boardćs direction usually appear. Based on analysis of experimental research results [1] special approximate mathematical models have been developed. The models enable simultaneously to consider the flexibility of mechanical fasteners in the connecting areas, as well as possible cracks appearing in the tensile area of the sheathing boards.
Ključne besede: civil engineering, timber structures, walls, CFRP strips, carbon fibre-reinforced polymer, mathematical modelling
Objavljeno: 31.05.2012; Ogledov: 1323; Prenosov: 28
URL Povezava na celotno besedilo

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Solving exterior problems of wave propagation based on an iterative variation of local DtN operators
Miroslav Premrov, Igor Špacapan, 2004, izvirni znanstveni članek

Opis: This paper discusses the problem of wave reflection from the fictitious boundary, with particular regard to the higher harmonic modes. This problem occurs when solving the wave equation in exterior domains using an asymptotic local low-order Dirichlet-to-Neumann (DtN) map for computational procedures applied to a finite domain. We demonstrate that the amplitudes of the reflected fictitious harmonics depend on the wave number, the location of the fictitious boundary, as well as on the local DtN operator used in the computations. Moreover, we show that a constant value of the asymptotic local low-order operator cannot sufficiently eliminate the amplitudes of all reflected waves, and that the results are poor especially for higher harmonics. We propose therefore an iterative method, which varies the tangential dependence of the local operator in each computational step. We only discuss some logical and interesting choices for the operators although this method permits several possibilities on how to vary the operator. The method is simple to apply and the presented examples demonstrate that the accuracy is considerably improved by iterations.
Ključne besede: wave motion, infinite domains, fictitious boundary, radiation condition, finite element method, Dirichlet-to-Neumann map
Objavljeno: 01.06.2012; Ogledov: 1078; Prenosov: 56
URL Povezava na celotno besedilo

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Wave motion in infinite inhomogeneous waveguides
Igor Špacapan, Miroslav Premrov, 2003, izvirni znanstveni članek

Opis: The analysis of wave motion in infinite homogeneous waveguides, having a complicated cross-section and/or an irregular inclusion, is a rather difficult task for the majority of available methods, especially when striving for accurate results. In contrast, this presented procedure performed in the frequency domain, is simple to apply. It yields correct results because the radiation conditions are considerably accurately satisfied, and it offers a clear parametric insight into wave motion. This procedure uses the FE modelling of an analysed section of the waveguide. It is based on the decomposition of wave motion, distinguishing propagating and non-propagating wavemodes by solving the eigenvalue problem. The presented examples demonstrate the effectiveness of this procedure, whilst a comparison between computed and analytical results demonstrates its accuracy.
Ključne besede: waves, wavemodes, waveguides, inhomogeneity, finite element method, parametric analysis, radiation conditions, eigenvalue problem, frequency domain
Objavljeno: 01.06.2012; Ogledov: 1479; Prenosov: 42
URL Povezava na celotno besedilo

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Tehniška mehanika : osnove statike in statično določene linijske konstrukcije
Igor Špacapan, 2003, univerzitetni, visokošolski ali višješolski učbenik z recenzijo

Ključne besede: tehniška mehanika, sile, podpore, linijski elementi, linijske konstrukcije
Objavljeno: 01.06.2012; Ogledov: 1729; Prenosov: 127
URL Povezava na celotno besedilo

8.
Tehniška mehanika : osnove statike in statično določene linijske konstrukcije
Igor Špacapan, 2003, univerzitetni, visokošolski ali višješolski učbenik z recenzijo

Opis:
Ključne besede: tehniška mehanika, sile, podpore, linijski elementi, linijske konstrukcije
Objavljeno: 01.06.2012; Ogledov: 2232; Prenosov: 230
URL Povezava na celotno besedilo

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