Angle bracket connections for CLT structures: Experimental characterization and numerical modelling

Pozza, Luca; Saetta, Anna; Savoia, Marco; Talledo, Diego

doi:10.1016/j.conbuildmat.2018.09.112

Cited by 43 publications

(17 citation statements)

References 23 publications

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“…The complicated behaviour of the angle bracket connections has also been studied by numerical simulations. For example, a finite-element based model was developed to simulate angle bracket connections under combined axial-shear loading conditions (Schneider et al 2014), and was further validated against destructive test results of a different angle bracket type subjected to the same loading condition (Pozza et al 2017, Pozza et al 2018. Nailed hold-down connections are commonly used to provide uplifting restraints for CLT shear walls.…”

Section: Introductionmentioning

confidence: 99%

Ductility and overstrength of nailed CLT hold-down connections

Dong

Ottenhaus

et al. 2020

Engineering Structures

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The structural performance of nailed hold-down connection systems used for cross-laminated timber (CLT) shear walls under monotonic and cyclic loading was experimentally evaluated. Critical connection performance parameters, including strength, stiffness, ductility, and overstrength, were derived from the testing of 68 hold-down connection specimens. The nailed CLT hold-down connections achieved moderate to high ductility when fracture failures of their metal brackets were avoided. The hold-down connection systems with 3 mm thick commercial brackets achieved ductility factors ranged from 2.7 to 4.3, while the hold-down connection systems composed of 10 mm thick steel plates and longer nails achieved larger ductility factors which ranged from 4.7 to 6.3. The overstrength factors of the holddown systems ranged from 1.45 to 1.62 except the one composed of the 10 mm thick brackets and 100 mm long nails installed at wide spacing. It was also found that the yield strength of the nailed hold-down connections under monotonic loading was similar to that obtained by cyclic loading.

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Section: Introductionmentioning

confidence: 99%

Ductility and overstrength of nailed CLT hold-down connections

Dong

Ottenhaus

et al. 2020

Engineering Structures

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“…In the early 2000s, the first research studies were conducted to investigate the monotonic and quasi-static mechanical behavior of CLT diaphragm and their corresponding joints in Europe and later in North America (Ceccotti et al 2006;Follesa et al 2010;Hossain et al 2015;Reynolds et al 2017). The vast majority of studies have focused on hold down or bracket connections, which are mostly used in low-rise buildings (Flatscher et al 2014;Gavric et al 2011Gavric et al , 2015aLatour and Rizzano 2015;Mahdavifar et al 2018;Pozza et al 2018;Schneider et al 2013Schneider et al , 2015. Additional studies have investigated CLT shear connections such as SS, HL, BJ, and HL connections were found to exhibit a higher loading capacity and ductility compared to SS connections with the same fastener type, fastener spacing, and CLT species and layers (Sullivan et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Characterization of Monotonic and Cyclic Performance of Cross-Laminated Timber Dowel-Type Connections

2021

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An immeasurable amount of greenhouse gas emissions during the process of steel purification and concrete production has attracted environmentally friendly engineers' attention to extend and enhance the use of wood as a structural material. During the last two decades, cross-laminated timber (CLT) has emerged as a high-strength engineered wood product to improve resistance and performance of timber structures, and is being used as a replacement for some mid and low-rise commercial buildings made of concrete and steel in the US. Due to the fact that CLT is a relatively new engineered wood product, there is a lack of knowledge on the mechanical behavior of CLT members and connections. The goal of the present study is to characterize the mechanical properties (specifically shear resistance) of three common types of CLT diaphragm connections including surface spline, half lap, and butt joint, and estimate the behavior of those connections in ultimate limit states, such as earthquake loads, and also serviceability limit states. In doing so, an experimental schedule was developed for a total of 56 tests accounting for different test variables including fastener orientation, type, length, and spacing. More specifically, two types of dowel-type fasteners, namely nail and screw, were considered, while the effect of fastener spacing and inclination was considered by changing the spacing of nails and driven angle of screws. The exerted force and displacement were recorded generating hysteresis curves to assess the failure mechanisms, shear modulus of elasticity, ultimate allowable shear strength and displacement, and energy dissipation of the various connections studied. A finite-element model based on elastoplastic behavior of CLT for a half-lap connection was also developed to estimate the shear behavior of this type of connection numerically and compare it with the experimental findings. Finally, the experimental results were used to compute the optimized hysteretic parameters (and their statistics) for the CUREE-SAWS hysteretic model for further adoption in modeling of diaphragm components by practicing engineers and researchers.

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“…Steel angle brackets (for horizontal sliding forces) and hold-downs (for vertical uplift forces) are the most common types of such connectors (Tomasi and Smith, 2014). Considerable experimental and numerical studies have been conducted on the mechanical behaviour of angle bracket and hold-down systems (Casagrande et al, 2017(Casagrande et al, , 2016Gavric et al, 2015;Pozza et al, 2018;Tamagnone et al, 2018). Experimental analyses show that both tensile and shear strength of angle brackets are considerably high.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling Analysis of Angle Bracket Connections Used in Cross Laminated Timber Constructions

Rezvani

Zhou

2019

mocs

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Connections are arguably one of the most critical components controlling the structural performance and failure modes of mass timber structures. Over the last two decades, demands for stronger and energy dissipative connections have been raised with increased application of mass timber products in larger and taller buildings. This paper presents numerical analyses of novel mass timber connections used in cross laminated timber structures. The connections are developed by MyTiCon with BB Stanz- und Umformtechnik GmbH angle bracket. Despite being relatively thin, these angle brackets could show comparable load resistance with thicker ones due to the reinforced web and folded edges. The commercially available finite element software ABAQUS was used to develop three dimensional (3D) numerical models to simulate the performance of angle bracket connections under different load combinations. The modelling analysis involves two phases: (1) to determine the most efficient fastener type and setup for the angle brackets connected to CLT wall and floor panels, and (2) to evaluate the capacity of angle brackets connected to CLT wall and floor panels in various loading scenarios. The findings of this study provide an insight into the behaviour of this new angle bracket connections and will be used in the design of the experimental tests in the next phase.

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Angle bracket connections for CLT structures: Experimental characterization and numerical modelling

Cited by 43 publications

References 23 publications

Ductility and overstrength of nailed CLT hold-down connections

Ductility and overstrength of nailed CLT hold-down connections

Experimental and Numerical Characterization of Monotonic and Cyclic Performance of Cross-Laminated Timber Dowel-Type Connections

Numerical Modelling Analysis of Angle Bracket Connections Used in Cross Laminated Timber Constructions

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