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1.
Mathematical modelling of timber-framed walls strengthened with CFRP strips
Miroslav Premrov, Peter Dobrila, 2008, izvirni znanstveni članek

Opis: 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.
Ključne besede: civil engineering, timber structures, frame walls, fibre-plaster boards, steel reinforcement, CFRP strips, mathematical modelling
Objavljeno: 01.06.2012; Ogledov: 1105; Prenosov: 31
URL Povezava na celotno besedilo

2.
Modelling of fastener flexibility in CFRP strengthened timber-framed walls using modified [gamma]-method
Miroslav Premrov, Peter Dobrila, 2008, izvirni znanstveni članek

Opis: 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.
Ključne besede: civil engineering, timber structures, frame walls, fibre-plaster boards, steel reinforcement, CFRP strips, carbon fibre-reinforced polymer, mathematical modelling
Objavljeno: 01.06.2012; Ogledov: 1225; Prenosov: 12
URL Povezava na celotno besedilo

3.
Approximate analytical solutions for diagonal reinforced timber-framed walls with fibre-plaster coating material
Miroslav Premrov, Peter Dobrila, Branko Bedenik, 2004, izvirni znanstveni članek

Opis: 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.
Ključne besede: civil engineering, timber structures, panel walls, fibre-plaster boards, steel reinforcement, steel diagonals, mathematical modelling
Objavljeno: 01.06.2012; Ogledov: 1150; Prenosov: 23
URL Povezava na celotno besedilo

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

Opis: 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.
Ključne besede: civil engineering, timber structures, panel walls, fibre-plaster boards, steel reinforcement, carbon fibres
Objavljeno: 01.06.2012; Ogledov: 1439; Prenosov: 39
URL Povezava na celotno besedilo

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