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Strength and Stiffness of Strong Double-Sided Wood-Frame Shear Walls with Continuous Steel Rod Hold-Downs in Mid-rise Timber Structures
Strong wood-frame shear walls comprising double-sided sheathing, small nail spacing, and continuous rod anchorage systems have recently attracted attention in high seismic regions such as Chile and New Zealand. Although a wide range of experimental research has been conducted on the lateral response of conventional high-capacity shear walls with discrete hold-downs, investigations on the lateral response of stronger wood-frame shear walls with continuous steel rods are quite limited. This paper presents a comprehensive study aimed to provide a better understanding of the response of such strong shear walls under very large lateral design loads (over 50 kN) in the context of the Canadian Standard (CSA O86-2019). The strength, stiffness, and lateral deflection of shear walls with discrete hold-downs and continuous steel rods were estimated using the design equations in the standard and compared with a wide range of test data reported in the literature. Comparative assessment of strong versus conventional shear walls showed that factored strength of shear walls was underestimated on average by 53% for strong shear walls with continuous steel rods. In terms of deflection, shear walls with continuous steel rods exhibited up to 23% less deflection compared to those with discrete hold-downs under the same lateral loads. Unlike conventional wood-frame shear walls, the CSA fourth-term deflection equation overpredicted the stiffness of some strong walls with special configurations. Although continuous rod hold-downs showed a significant effect on both maximum strength and initial stiffness of the strong shear walls examined in this study, further numerical studies validated by testing data are suggested to better understand the behaviour of strong shear walls in practice. Virtual testing of different wall configurations under seismic loads is recommended to optimize the design of cost-effective mid-rise wood-frame buildings in the future.
Strength and Stiffness of Strong Double-Sided Wood-Frame Shear Walls with Continuous Steel Rod Hold-Downs in Mid-rise Timber Structures
Strong wood-frame shear walls comprising double-sided sheathing, small nail spacing, and continuous rod anchorage systems have recently attracted attention in high seismic regions such as Chile and New Zealand. Although a wide range of experimental research has been conducted on the lateral response of conventional high-capacity shear walls with discrete hold-downs, investigations on the lateral response of stronger wood-frame shear walls with continuous steel rods are quite limited. This paper presents a comprehensive study aimed to provide a better understanding of the response of such strong shear walls under very large lateral design loads (over 50 kN) in the context of the Canadian Standard (CSA O86-2019). The strength, stiffness, and lateral deflection of shear walls with discrete hold-downs and continuous steel rods were estimated using the design equations in the standard and compared with a wide range of test data reported in the literature. Comparative assessment of strong versus conventional shear walls showed that factored strength of shear walls was underestimated on average by 53% for strong shear walls with continuous steel rods. In terms of deflection, shear walls with continuous steel rods exhibited up to 23% less deflection compared to those with discrete hold-downs under the same lateral loads. Unlike conventional wood-frame shear walls, the CSA fourth-term deflection equation overpredicted the stiffness of some strong walls with special configurations. Although continuous rod hold-downs showed a significant effect on both maximum strength and initial stiffness of the strong shear walls examined in this study, further numerical studies validated by testing data are suggested to better understand the behaviour of strong shear walls in practice. Virtual testing of different wall configurations under seismic loads is recommended to optimize the design of cost-effective mid-rise wood-frame buildings in the future.
Strength and Stiffness of Strong Double-Sided Wood-Frame Shear Walls with Continuous Steel Rod Hold-Downs in Mid-rise Timber Structures
Lecture Notes in Civil Engineering
Desjardins, Serge (editor) / Poitras, Gérard J. (editor) / El Damatty, Ashraf (editor) / Elshaer, Ahmed (editor) / Afshari, Zahra (author) / Cheraghi-Shirazi, Najmeh (author) / Ni, Chun (author) / Estrella, Xavier (author) / Malek, Sardar (author)
Canadian Society of Civil Engineering Annual Conference ; 2023 ; Moncton, NB, Canada
2024-09-26
12 pages
Article/Chapter (Book)
Electronic Resource
English
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