| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

Search the digital library catalog Help

Query: search in
search in
search in
search in
* old and bologna study programme

Options:
  Reset


1 - 10 / 47
First pagePrevious page12345Next pageLast page
1.
Dimenzioniranje armiranobetonskih konstrukcij po metodi mejnih stanj
Peter Dobrila, 2024

Abstract: Publikacija predstavlja zelo obširen spekter dimenzioniranja armirano-betonskih (AB) elementov, tako linijskih, kot ploskovnih elementov. Posamična poglavja so tematsko zasnovana tako, da so najprej predstavljene osnovne teoretične osnove osnovnih mehanskih mehanizmov posameznega obremenitvenega problema konstrukcijskih elementov, v drugem delu pa nato še aplikacije na specifični primer uporabe veljavnih Evrokod standardov. V posameznih poglavjih so na koncu podani tudi posebni konkretni računski primeri, ki bralcu približajo uporabo Evrokod standardov na posameznih izbranih vzorčnih primerih. Dodatno pa bo publikacija lahko zelo koristen učni in uporabniški pripomoček tudi za projektante armirano-betonskih konstrukcij v projektivnih birojih, ter v določeni meri tudi za izvajalce gradbenih del. Publikacija je sicer tematsko razdeljena v 14 ločenih samostojnih poglavij.
Keywords: beton, konstrukcije, mehanika konstrukcij, evrokod standardi, metoda mejnih stanj
Published in DKUM: 15.03.2024; Views: 364; Downloads: 44
.pdf Full text (16,82 MB)
This document has many files! More...

2.
Reinforced prefabricated timber shear walls
Miroslav Premrov, Peter Dobrila, 2002, original scientific article

Abstract: The paper presents results of shear-bending experiments performed on panel shear walls used as load-carrying capacity walls in the construction of prefabricated timber structures. The aim of research is to determine the difference in resistance and ductility between panel shear walls, reinforced with two different methods. While the first, reinforcing with additional fiberboard, was not improve resistance and especially ductility in the contended sense, we tried to find a solution by inserting diagonal steel strips, which were fixed to the timber frame. Additionally, analytical solutions of those by mathematical modeling with the fictive thickness and height of fiber-plaster boards are proposed. Presented design models are simple and show a good coincidence with the measured results.
Keywords: timber structures, shear walls, shear bending tests, mathematical modelling
Published in DKUM: 01.06.2012; Views: 3064; Downloads: 40
URL Link to full text

3.
Reinforcing methods for composite timber frame-fiberboard wall panels
Peter Dobrila, Miroslav Premrov, 2003, original scientific article

Abstract: This paper presents different possibilities on how to reinforce timber frame wall panels, which are mainly used as load-carrying capacity elements in the construction of prefabricated timber structures. These walls can be treated as composite elements composed of a timber frame and fiber-plaster boards. As the boards are the weaker part of the system they need to be somehow reinforced in order to assure the resistance and ductility of the elements especially in multi-level buildings located in seismic or windy areas. The aim of this research is to determine the differences in resistance and ductility between elements, reinforced using two different methods. Whilst the first, using additional fiberboards, does not improve the resistance and especially the ductility in the contended sense, it is more convenient for finding a solution when inserting diagonal steel strips, which are fixed to the timber frame.
Keywords: timber structures, stene, fiber-plaster boards, steel diagonals, mathematical models
Published in DKUM: 01.06.2012; Views: 2461; Downloads: 106
URL Link to full text

4.
Analysis of timber-framed walls coated with CFRP strips strengthened fibre-plaster boards
Miroslav Premrov, Peter Dobrila, Branko Bedenik, 2004, original scientific article

Abstract: This paper provides an experimental analysis of timber-framed walls, coated with carbon fibre-reinforced polymers (CFRP) strengthened fibre-plaster boards, usually used as main bearing capacity elements in the construction of prefabricated timber structures. The tensile strength of the fibre-plaster boards is lower than the strength of timber frame, therefore it is convenient to strengthen boards with high-strength materials in order to gain a higher capacity. It has been shown that the inclusion of CFRP diagonal strip reinforcement on the load-carrying capacity can be quite high and that it is maximized when the carbon strips are connected to the timber frame. On the other hand, the ductility itself was not significantly improved. The test samples proved an important distinction in behaviour in timber frame-fibreboard connecting area, dependant on the boundary conditions between inserted CFRP strips and timber frame. It has been shown that proposed simplified Eurocode 5 methods, applicable for wood-based sheathing boards, could be unsuitable for the problems presented.
Keywords: civil engineering, timber structures, panel walls, fibre-plaster boards, steel reinforcement, carbon fibres
Published in DKUM: 01.06.2012; Views: 2471; Downloads: 99
URL Link to full text

5.
Approximate analytical solutions for diagonal reinforced timber-framed walls with fibre-plaster coating material
Miroslav Premrov, Peter Dobrila, Branko Bedenik, 2004, original scientific article

Abstract: This paper provides approximate analytical solutions for diagonally reinforced timber-framed panel walls usually used as main bearing capacity elements in the construction of prefabricated timber structures. These walls can be mathematically treated as composite elements made of a timber frame and fibre-plaster boards as a coating material. As boards are the weakest part of the system they are reinforced with steel diagonals. The proposed approximate analytical models with the fictitious thickness and width of fibre-plaster boards enable simultaneously to consider the influence of inserted steel diagonals, flexibility of mechanical fasteners between the boards and the timber frame and any appearing cracks in the tensile area of the fibre-plaster boards. The obtained numerical results show good agreement with the measured experimental results.
Keywords: civil engineering, timber structures, panel walls, fibre-plaster boards, steel reinforcement, steel diagonals, mathematical modelling
Published in DKUM: 01.06.2012; Views: 2405; Downloads: 92
URL Link to full text

6.
Modelling of fastener flexibility in CFRP strengthened timber-framed walls using modified [gamma]-method
Miroslav Premrov, Peter Dobrila, 2008, original scientific article

Abstract: The paper provides semi-analytical modelling for prefabricated timber-framed walls using the modified ▫$/gamma$▫-method. The walls are composed of a timber frame and gypsum plasterboards (GPB) which are flexibly connected to the timber frame. Because the tensile strength of the GPB is approximately 10-times lower than the compressive one, it is convenient to strengthen the boards in their tensile diagonal direction with carbon fibre-reinforced polymer (CFRP) strips, which are glued to the boards. Additionally, in the proposed mathematical model the classical beam theory is used taking into account a fasteners' flexibility in the timber frame - GPB connecting area, as well as crack appearing in the GPB and an influence of the inserted CFRP strips. Therefore the CFRP strip contribution is considered with a modified slip modulus which results in the fictive increased stiffness coefficient of the fasteners.
Keywords: civil engineering, timber structures, frame walls, fibre-plaster boards, steel reinforcement, CFRP strips, carbon fibre-reinforced polymer, mathematical modelling
Published in DKUM: 01.06.2012; Views: 2275; Downloads: 31
URL Link to full text

7.
Mathematical modelling of timber-framed walls strengthened with CFRP strips
Miroslav Premrov, Peter Dobrila, 2008, original scientific article

Abstract: This paper provides mathematical modelling for prefabricated timber-framed walls composed of a timber frame and fibre-plaster boards. Because the tensile strength of the fibre-plaster boards is approximately 10-times lower than the compressive one, it is convenient to strengthen the boards in their tensile diagonal direction with carbon fibre-reinforced polymer (CFRP) strips, which are glued to the boards. Based on analysis of experimental research results [7] special approximate mathematical models have been developed. The models enable simultaneously to consider the influence of inserted CFRP strips, flexibility of mechanical fasteners in the connecting areas and any appearing of tensile cracks in the coating boards.
Keywords: civil engineering, timber structures, frame walls, fibre-plaster boards, steel reinforcement, CFRP strips, mathematical modelling
Published in DKUM: 01.06.2012; Views: 2240; Downloads: 96
URL Link to full text

8.
Analysis of composite T beam composed of timber, concrete and carbon strip
Matjaž Tajnik, Peter Dobrila, Miroslav Premrov, 2007, original scientific article

Abstract: This paper provides a mathematical model and numerical example of composite T-section composed of a concrete plate and a timber beam strengthened at the bottom tension side with a carbon fibre-reinforced polymer (CFRP) strip. Analysis is provided in accordance with the European standards for timber, steel and concrete structures. The tensile strength of the carbon strip as well as the compressive strength of the concrete plate are higher than the bending strength of the timber beam, therefore it is convenient to use such composition of material to gain a higher load bearing capacity. It has been shown that the inclusion of CFRP strip reinforcement on the increase of load carrying and bending stiffness capacity was not as high as expected. On the other hand, we realized the importance of variety of material grade and geometrical properties combinations between sub-components which can significantly improve load bearing capacity and stiffness of composed beam. Furthermore, the CFRP strip contribution to the bending resistance and stiffness of the element is presented as a function of the fastener spacing intervals between concrete plate and timber beam.
Keywords: composite structures, timber structures, carbon strip, load bearing capacity, modeling
Published in DKUM: 31.05.2012; Views: 2063; Downloads: 60
URL Link to full text

9.
Slip modeling in timber-framed walls with wood-based or fibre-plaster sheathing boards
Miroslav Premrov, Peter Dobrila, Branko Bedenik, Igor Špacapan, 2007, original scientific article

Abstract: 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.
Keywords: civil engineering, timber structures, walls, CFRP strips, carbon fibre-reinforced polymer, mathematical modelling
Published in DKUM: 31.05.2012; Views: 2032; Downloads: 41
URL Link to full text

10.
STATIČNA IN TRDNOSTNA ANALIZA ARMIRANOBETONSKEGA NOSILCA Z NEKONSTANTNIM PREREZOM
Aleš Ošep, 2010, undergraduate thesis

Abstract: V diplomskem delu je obravnavan statično določen armiranobetonski nosilec nekonstantnega prereza, dolžine 15 m. Nosilec je definiran kot primarni nosilec v sklopu montažnih konstrukcij. Dimenzionirana je potrebna armatura, in preverjeni so povesi nosilca. Zaradi spremenljive statične višine je vzdolžna armatura položena konstantno po celotni dolžini nosilca, razen 2 Ø16. Stabilnost nosilca na zvrnitev izven ravnine zagotavljajo II plošče, katere so definirane kot sekundarna konstrukcija. Nosilec je dimenzioniran na podlagi evropskih predpisov za dimenzioniranje konstrukcij -Evrokodov oziroma po slovenskih veljavnih predpisih SIST.
Keywords: betonske konstrukcije, montažne konstrukcije, statično določen nosilec nekonstantnega prereza, dimenzioniranje
Published in DKUM: 21.07.2010; Views: 3019; Downloads: 276
.pdf Full text (1,34 MB)

Search done in 0.3 sec.
Back to top
Logos of partners University of Maribor University of Ljubljana University of Primorska University of Nova Gorica