Browsing by Author "Montaño Castañeda, Jairo Alonso"

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    New enhanced hybrid glulam-framed OSB wall for tall timber buildings
    (Elsevier Ltd, 2024) Carrero, Tulio; Montaño Castañeda, Jairo Alonso; Pérez, Luis; Doudak, Ghasan; Santa María Oyanedel, Hernan; Chacón de la Cruz, Matías Fernando Nicolas; Guindos Bretones, Pablo
    The article covers the cyclic lateral performance of a new hybrid timber shear wall called GLUlam-Frame OSB (GLUFO), composed of glulam frames connected to OSB (Oriented-Strand Board) sheathing panels and conventional nails. The key constructive detail of this new wall relies in that the OSB sheathings are embedded at grooved glulam members, which largely enhance the lateral strength capacity and stiffness of the element than the conventional light-frame timber or Cross-Laminated Timber (CLT) walls. The experimental campaign includes the Framing-to-Panel (F2P) connections and full-scale wall testing under cyclic loads. The wall failed due to a horizontal tensile fracture along the top beam, mainly caused by insufficient nail spacing. However, the wall reached a lateral drift of 1.48 % and a ductility of 5.8, which could have been higher if the failure had not occurred. Moreover, the proposed wall is three times stronger and stiffer than a conventional CLT wall and comprises one-fourth of the wood amount (0.89 m3) compared to a CLT wall of similar strength capacity. Finally, the proposed wall was characterized by a nonlinear macro-Finite Element (FE) model, whose F2P connections were simulated with the MSTEW hysteretic model, and three Single-Degree-Of-Freedom (SDOF) models, each with a different hysteretic model from the literature (MSTEW, DowelType, and ASPID). All numerical models show an error of up to 8 % for the lateral strength capacity, while the SDOF models are more precise for the energy dissipation prediction, with a error lower than 4.3 % and R2 for their history over 99.5 %. Hence, both numerical models provide a feasible alternative to simulate this new wall prototype.
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    Static and dynamic performance of direct hybrid connections of cross-laminated timber with steel, concrete and laminated strand lumber composites
    (2020) Carrero Roa, Tulio Enrique; Montaño Castañeda, Jairo Alonso; Santa María Oyanedel, Hernán; Guindos Bretones, Pablo
    Hybrid multistory buildings are every day more common in the construction industry. However, there is little understanding of the performance of the hybrid connections. In this research, the static and dynamic response of cross-laminated timber (CLT) composites combined with reinforced concrete (RC), hollow steel profiles and laminated strand lumber (LSL) has been investigated. In addition, the effects of posttensioning stresses as well as distinct types of connectors such as nails, self-tapping screws and self-tapping dowels has been accounted for. After experimental work, numerical modelling for simulating the static and dynamic behavior for these hybrid connections was also investigated. Results indicate that such massive timber composite connections behave reasonably similar to conventional timber connections, except in that inelastic deformations may increase up to 200%. In addition, it has been found that existing hysteretic models like the modified Stewart hysteretic model (MSTEW) fit for modelling purposes except that very asymmetric hysteretic behavior can be found for timber-concrete hybrid connections.
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    Testing of strong multi-layered wood frame shear walls with non-structural layers
    (Springer International Publishing, 2023) Valdivieso Cascante, Diego Nicolas; López-García González, Diego; Montaño Castañeda, Jairo Alonso; Guindos Bretones, Pablo
    In areas of high seismic activity it is important to provide Light Frame Timber Buildings (LFTBs) with enhanced levels of lateral stiffness and strength, as well as to prevent excessive levels of non-structural (NSC) damage. Chilean wood-frame shear walls are usually sheathed at both sides with OSB and covered by one/two-ply type X gypsum wallboard (GWB) fastened to the frame with narrow patterns of nails or screws. The result is a multi-layered strong shear wall (MLSSW), which is not considered as such by design codes and mechanical models. The objective of this paper is to report an experimental evaluation of typical Chilean MLSSWs, with emphasis on the influence of NSCs. Connection-level and assembly-level of 1:1 aspect ratio shear walls were evaluated through experimental tests. Results showed increments of 53% and 160% in elastic stiffness and maximum capacity, respectively, while keeping virtually the same deformation capacity and energy dissipation of equivalent bare (non-GWB finished) shear walls. It is postulated that such increases may arise from the high embedment strength of the GWB, and that the deeply screwed GWB may prevent nails from pulling out during hysteresis cycles. It is concluded that GWBs have a significant structural influence on MLSSWs, and such influence should be taken into account in structural design.
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    Testing of strong multi-layered wood frame shear walls with non-structural layers
    (2023) Valdivieso Cascante, Diego Nicolas; López-García González, Diego; Montaño Castañeda, Jairo Alonso; Guindos Bretones, Pablo
    In areas of high seismic activity it is important to provide Light Frame Timber Buildings (LFTBs) with enhanced levels of lateral stiffness and strength, as well as to prevent excessive levels of non-structural (NSC) damage. Chilean wood-frame shear walls are usually sheathed at both sides with OSB and covered by one/two-ply type X gypsum wallboard (GWB) fastened to the frame with narrow patterns of nails or screws. The result is a multi-layered strong shear wall (MLSSW), which is not considered as such by design codes and mechanical models. The objective of this paper is to report an experimental evaluation of typical Chilean MLSSWs, with emphasis on the influence of NSCs. Connection-level and assembly-level of 1:1 aspect ratio shear walls were evaluated through experimental tests. Results showed increments of 53% and 160% in elastic stiffness and maximum capacity, respectively, while keeping virtually the same deformation capacity and energy dissipation of equivalent bare (non-GWB finished) shear walls. It is postulated that such increases may arise from the high embedment strength of the GWB, and that the deeply screwed GWB may prevent nails from pulling out during hysteresis cycles. It is concluded that GWBs have a significant structural influence on MLSSWs, and such influence should be taken into account in structural design.
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    Testing the influence of 3D coupling effects on the lateral response of non-planar T-shape wood frame shear walls
    (Springer International Publishing, 2023) Valdivieso Cascante, Diego Nicolas; López-García, González Diego; Almazán Campillay, José Luis; Montaño Castañeda, Jairo Alonso; Guindos Bretones, Pablo
    Cumulative shear wall overturning (CSWO) is a common response of structural models of multistory Light-Frame Timber Buildings (LFTBs) under lateral loads. Governed by holdown uplift and shear wall (SW) bending, large CSWO occurs in LFTBs due to the light self-weight of wood and the dominant rocking flexibility of stiff SWs. Even though CSWO is paramount in seismic design because of its effect on the flexibility of LFTBs (making hard to achieve the inter-story drift limits), this phenomenon is not incorporated into the structural models of LFTBs. For instance, in the design of LFTBs for lateral loads it is assumed that SWs behave as planar isolated elements. However, CSWO may be influenced by 3D coupling effects (3D-SWCE) in non-planar SWs such as T or L assemblies. This paper describes a large full-scale experiment of a 7.32 m x 5.1 m assembly, performed to gather insight into 3D-SWCEs through the cyclic evaluation of a non-planar T-shape SW. Results showed an asymmetric behaviour of the T-shape SW with increments of 20% and 98% in elastic stiffness and maximum capacity, respectively, with respect to those of a planar SW. It is concluded that 3D-SWCEs have a significant structural influence on the response of LFTBs.
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    Testing the influence of 3D coupling effects on the lateral response of non-planar T-shape wood frame shear walls
    (2023) Valdivieso Cascante, Diego Nicolas; López-García, González Diego; Almazán Campillay, José Luis; Montaño Castañeda, Jairo Alonso; Guindos Bretones, Pablo
    Cumulative shear wall overturning (CSWO) is a common response of structural models of multistory Light-Frame Timber Buildings (LFTBs) under lateral loads. Governed by holdown uplift and shear wall (SW) bending, large CSWO occurs in LFTBs due to the light self-weight of wood and the dominant rocking flexibility of stiff SWs. Even though CSWO is paramount in seismic design because of its effect on the flexibility of LFTBs (making hard to achieve the inter-story drift limits), this phenomenon is not incorporated into the structural models of LFTBs. For instance, in the design of LFTBs for lateral loads it is assumed that SWs behave as planar isolated elements. However, CSWO may be influenced by 3D coupling effects (3D-SWCE) in non-planar SWs such as T or L assemblies. This paper describes a large full-scale experiment of a 7.32 m x 5.1 m assembly, performed to gather insight into 3D-SWCEs through the cyclic evaluation of a non-planar T-shape SW. Results showed an asymmetric behaviour of the T-shape SW with increments of 20% and 98% in elastic stiffness and maximum capacity, respectively, with respect to those of a planar SW. It is concluded that 3D-SWCEs have a significant structural influence on the response of LFTBs.