1. Preiskave lesenih okvirnih stenskih panelov s cementno-ivernimi obložnimi ploščamiMeta Kržan, Tomaž Pazlar, Ivan Grašič, Boštjan Ber, 2020, izvirni znanstveni članek Povzetek: V članku so predstavljeni rezultati eksperimentalnih preiskav študije obnašanja lesenih okvirnih stenskih panelov s cementno-ivernimi obložnimi ploščami pri horizontalnih obremenitvah. Posebnost predstavljene preiskave je uporaba cementno-ivernih plošč pri proizvodnji okvirnih stenskih panelov, saj njihovo obnašanje še ni dobro raziskano. Preiskave so bile izvedene v dveh fazah. Ker je za strižno obnašanje panela bistveno pritrjevanje obložnih plošč na leseni okvir, so se na manjših vzorcih najprej določile nosilnosti zvez s kovinskimi paličastimi sponkami ter analiziral vpliv debelin plošč in razmika med sponkami. Nadalje so bile zasnovane in izvedene monotone in ciklične strižne preiskave različnih izvedb stenskih panelov. Preskušani so bili trije osnovni tipi panelov, med drugim tudi panel z različnima debelinama obložnih plošč. Rezultati preiskave kažejo ugoden duktilen odziv sten pri strižnih obremenitvah ter potrjujejo, da nosilnost sten zaradi različnih debelin obložnih plošč ni dodatno zmanjšana, kot to pri izračunu nosilnosti predvideva SIST EN 1995-1-1. Ključne besede: leseni okvirni stenski paneli, cementno-iverna plošča, strižni preskus, nosilnost sponke v eni strižni ravnini.
Ključne besede: leseni okvirni stenski paneli, cementno-iverna plošča, ciklični strižni preskus, nosilnost sponke v eni strižni ravnini
Objavljeno v DiRROS: 04.12.2023; Ogledov: 219; Prenosov: 89
 Celotno besedilo (1,84 MB)
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2. Improved seismic response of light-frame-timber panels with cement-particle-board sheathing of various thicknesses and different configurations of fastenersMeta Kržan, Tomaž Pazlar, Boštjan Ber, 2022, izvirni znanstveni članek Povzetek: Due to their comparable fire characteristics and surface preparation, light-frame timber panels using cement-particle boards (CPB) as a sheathing material present a potential alternative to gypsum-fibre boards. An experimental campaign was conducted to evaluate the behaviour of CPB light-frame-timber panels under in-plane lateral loading. Monotonic and cyclic in-plane shear tests were conducted on full-size panels, following preceding tests on the stapled sheathing-to-timber connections used in the panels. The influence of the boards’ thickness and staple geometry on the response of connections and panels was studied, also on panels with an asymmetrical CPB layout, which proved not to have a negative influence on the panels’ lateral load-bearing capacity. Furthermore, in order to improve the seismic response, panels, which had almost twice the number of staples compared to the basic panel, were tested; one variation with two rows of staples, and the other with the staples spaced closer together, such that the spacing distance was halved. The tests revealed a significant, though not proportional, increase in lateral resistance in the strengthened panels. Fastening the CPB with two rows of staples proved the better option, since subsequent failure of the CPB along the connections, as opposed to ductile failure of the staples in the basic panels, proved not to reduce the panels’ deformation capacity. The paper also compares the test results of the connections and panels to analytical results according to Eurocode 5 (EC5), the European code provision for the design of timber structures.
Ključne besede: light-frame timber panels, cement-particle board sheathing, cyclic shear tests, sheathing-to-timber connection, asymmetrical panel, staple spacing distance, EN 1995–1-1, open access
Objavljeno v DiRROS: 31.05.2023; Ogledov: 403; Prenosov: 192
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3. Composite beams made of waste wood-particle boards, fastened to solid timber frame by dowel-type fastenersMeta Kržan, Tomaž Pazlar, Boštjan Ber, 2023, izvirni znanstveni članek Povzetek: To increase the sustainability of prefabricated timber buildings and constructions, composite timber beams with “box” cross-sections were developed in collaboration with an industry partner. They were constructed from a solid timber frame and from webs made of residual waste wood- particle boards from prefabricated timber buildings production. The developed beams’ design concepts presented in this paper were governed by architectural features of prefabricated timber buildings, geometrical limitations, available production technology, and structural demand related to various possible applications. The paper presents the results of experimental bending tests of six variations of the developed composite timber beams constructed by mechanical fasteners only. The developed design concept of composite timber beams without adhesives is beneficial compared to glued beams in terms of design for deconstruction and lower VOC emissions. The tests were conducted to study the influence of the following parameters on the beams’ mechanical behavior: (i) web material (oriented strand boards (OSBs) vs. cement-particle boards); (ii) the influence of beam timber frame design (flanges and web stiffeners vs. flanges, web stiffeners, and compressive diagonals), and (iii) the influence of stiffener–flange joint design. Besides the beams’ load-bearing capacities, their linear and non-linear stiffness characteristics were the main research interest. While adding compressive timber diagonals did not prove to significantly increase the stiffness of the beams in the case of cement-particle board webs, it increased their load-bearing capacity by enabling the failure of flanges instead of prior webs and stiffener–flange joints failure. For beams with OSB webs, failure of the bottom flange was achieved already with the “basic” timber frame design, but timber diagonals proved beneficial to increase the stiffness characteristics. Finally, mechanical characteristics of the developed beams needed in structural design for their application are provided together with further development guidelines.
Ključne besede: composite timber beam, box beam, OSB, cement-particle boards, innovative engineered wood product, experimental tests, flexural performance, mechanical fasteners, open access
Objavljeno v DiRROS: 29.05.2023; Ogledov: 256; Prenosov: 154
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