1. Cost estimation, optimization and competitiveness of different composite floor systemsUroš Klanšek, Stojan Kravanja, 2006, izvirni znanstveni članek Opis: This paper presents selfmanufacturing cost estimation, cost optimization and competitiveness of different composite floor systems: composite I beams, composite trusses produced from rolled channel sections and composite trusses made from cold formed hollow sections. Part 1 of this twopart series of papers presents the estimation of the selfmanufacturing (direct production) costs for composite and steel structures. The selfmanufacturing costs are proposed to be defined as the sum of the material, the power consumption and the labour costs. The material costs of the structural steel, concrete, reinforcement, the shear connectors, electrodes, the anticorrosion, fire protection and top coat painting, the formwork floorslab panels and gas consumption are presented in detail. The power consumption costs comprise costs of sawing the steel sections, edge grinding, drilling, welding, stud welding and vibrating the concrete. The labour costs (times) presented define the costs of metal cutting, edge grinding, preparation, assembling and tacking, welding, welding of shear connectors, steel surface preparation and protection, drilling, cutting, placing and connecting the reinforcement, concreting, consolidating and curing the concrete. New approximation functions are proposed for the calculation of some manufacturing times and material consumptions. As the discussed costs vary significantly around the world, the proposed cost expressions are given in the open form to be used for cost estimation in different economic conditions. A numerical example of the estimation of the selfmanufacturing costs for a composite I beam floor system shows the suitability of the proposed approach. On the basis of the defined selfmanufacturing costs, introduced in Part 1, the cost optimization and the competitiveness of different composite floor systems are discussed in Part 2. Ključne besede: cost estimation, selfmanufacturing costs, material costs, power consumption costs, labour costs, steel structures, composite structures, welded structures Objavljeno: 30.05.2012; Ogledov: 1459; Prenosov: 21 Povezava na celotno besedilo 
2. Mathematical modelling of timberframed walls strengthened with CFRP stripsMiroslav Premrov, Peter Dobrila, 2008, izvirni znanstveni članek Opis: This paper provides mathematical modelling for prefabricated timberframed walls composed of a timber frame and fibreplaster boards. Because the tensile strength of the fibreplaster boards is approximately 10times lower than the compressive one, it is convenient to strengthen the boards in their tensile diagonal direction with carbon fibrereinforced 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. Ključne besede: civil engineering, timber structures, frame walls, fibreplaster boards, steel reinforcement, CFRP strips, mathematical modelling Objavljeno: 01.06.2012; Ogledov: 1357; Prenosov: 66 Povezava na celotno besedilo 
3. Modelling of fastener flexibility in CFRP strengthened timberframed walls using modified [gamma]methodMiroslav Premrov, Peter Dobrila, 2008, izvirni znanstveni članek Opis: The paper provides semianalytical modelling for prefabricated timberframed 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 10times lower than the compressive one, it is convenient to strengthen the boards in their tensile diagonal direction with carbon fibrereinforced 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. Ključne besede: civil engineering, timber structures, frame walls, fibreplaster boards, steel reinforcement, CFRP strips, carbon fibrereinforced polymer, mathematical modelling Objavljeno: 01.06.2012; Ogledov: 1431; Prenosov: 17 Povezava na celotno besedilo 
4. Approximate analytical solutions for diagonal reinforced timberframed walls with fibreplaster coating materialMiroslav Premrov, Peter Dobrila, Branko Bedenik, 2004, izvirni znanstveni članek Opis: This paper provides approximate analytical solutions for diagonally reinforced timberframed 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 fibreplaster 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 fibreplaster 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 fibreplaster boards. The obtained numerical results show good agreement with the measured experimental results. Ključne besede: civil engineering, timber structures, panel walls, fibreplaster boards, steel reinforcement, steel diagonals, mathematical modelling Objavljeno: 01.06.2012; Ogledov: 1450; Prenosov: 60 Povezava na celotno besedilo 
5. Analysis of timberframed walls coated with CFRP strips strengthened fibreplaster boardsMiroslav Premrov, Peter Dobrila, Branko Bedenik, 2004, izvirni znanstveni članek Opis: This paper provides an experimental analysis of timberframed walls, coated with carbon fibrereinforced polymers (CFRP) strengthened fibreplaster boards, usually used as main bearing capacity elements in the construction of prefabricated timber structures. The tensile strength of the fibreplaster boards is lower than the strength of timber frame, therefore it is convenient to strengthen boards with highstrength materials in order to gain a higher capacity. It has been shown that the inclusion of CFRP diagonal strip reinforcement on the loadcarrying 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 framefibreboard 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 woodbased sheathing boards, could be unsuitable for the problems presented. Ključne besede: civil engineering, timber structures, panel walls, fibreplaster boards, steel reinforcement, carbon fibres Objavljeno: 01.06.2012; Ogledov: 1698; Prenosov: 72 Povezava na celotno besedilo 
6. Reinforcing methods for composite timber framefiberboard wall panelsPeter Dobrila, Miroslav Premrov, 2003, izvirni znanstveni članek Opis: This paper presents different possibilities on how to reinforce timber frame wall panels, which are mainly used as loadcarrying capacity elements in the construction of prefabricated timber structures. These walls can be treated as composite elements composed of a timber frame and fiberplaster 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 multilevel 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. Ključne besede: timber structures, stene, fiberplaster boards, steel diagonals, mathematical models Objavljeno: 01.06.2012; Ogledov: 1435; Prenosov: 78 Povezava na celotno besedilo 
7. Buckling behavior of coldformed studs with thermal perforationsMarsel Garifullin, Alexey Sinelnikov, Maria Bronzova, Boštjan Kovačič, Rok Kamnik, 2016, objavljeni znanstveni prispevek na konferenci Opis: Studies have shown that the optimal structural scheme for lowrise buildings that meets all regulatory requirements is a frame system. In this connection, thinwalled coldformed steel (CFS) profiles seem to be the best material for constructing light steel framed (LSF) walls. The framework of LSF walls is usually constructed from CFS Cshaped profiles. To increase the thermal effectiveness of a wall, CFS profiles usually have thermal perforations and thus are called thermoprofiles. However, these openings have a negative impact on bearing capacity of profiles and require accurate evaluation. In this article a relatively new reticularstretched thermoprofile with diamondshaped openings is considered. The article deals with the buckling analysis of perforated CFS Csections subjected to compression. Ključne besede: structural engineering, steel structures, computer simulations, nonlinear model Objavljeno: 29.08.2016; Ogledov: 615; Prenosov: 285 Celotno besedilo (2,85 MB) Gradivo ima več datotek! Več...
