Ductility in Timber Structures: Investigations on Over-Strength Factors

Brühl, Frank; Schänzlin, Jörg; Kuhlmann, Ulrike

doi:10.1007/978-94-007-7811-5_17

Cited by 9 publications

(9 citation statements)

References 1 publication

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“…This often leads to either unsafe or uneconomical design. So far, very limited studies have been conducted to establish overstrength factors for some timber connection types (Gavric et al 2015b, Brühl et al 2014, Ottenhaus et al 2018a, Ottenhaus et al 2018b).…”

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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“…Therefore, several researchers attempted to identify individual overstrength components and derived γ Rd,th for connections (Jorissen and Fragiacomo 2011, Schick at al. 2013, Brühl et al 2014, Gavric et al 2014, Vogt et al 2014, Izzi et al 2016, O'Ceallaigh and Harte 2019). An overview of some connection overstrength values in literature for connections in Glued Laminated Timber (Glulam) and Cross Laminated Timber (CLT) is given in Table 1.…”

Section: Overstrength Theory In Capacity Designmentioning

confidence: 99%

Analytical Derivation and Experimental Verification of Overstrength Factors of Dowel-type Timber Connections for Capacity Design

Ottenhaus

Smith

2020

Journal of Earthquake Engineering

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Analytical derivation and experimental verification of overstrength factors of dowel-type timber connections for capacity designIn timber structures, connections traditionally provide ductility and energy dissipation under seismic loading. Capacity design ensures that the global structural response is ductile by applying overstrength to the design demand of brittle elements. Overstrength is often derived experimentally which is costly and time consuming. This paper proposes an analytical method to estimate the overstrength of dowel-type timber connections based on inherent material properties, thereby reducing the need for experimental testing. The method is validated with data from previous experiments and literature for dowelled, bolted, and nailed timber connections, and provides reasonably accurate upper-bound overstrength estimates.

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“…Yielding of metal connectors together with compressive failure of the wood are the main sources of ductility in timber joints (Thelandersson and Honfi 2009). The ductility of metal fasteners in timber has been assessed by Kuhlmann et al (2006), Malo et al (2011) and Brühl et al (2011Brühl et al ( , 2014. Stehn and Börjes (2004) showed that the deformation and load-carrying capacity of timber trusses may be increased by using ductile steel connectors.…”

Section: Design For Structural Robustnessmentioning

confidence: 99%

“…plastic yielding in connections will occur before brittle failure of the members (Jorissen and Fragiacomo 2011;Lawrence 2014). In this context, an overstrength factor may be used to quantify how much stronger brittle elements are than ductile elements (Brühl et al 2014). Brühl et al (2011) have shown that it is possible to implement a desired level of fastener ductility in timber structures.…”

Section: Design For Structural Robustnessmentioning

confidence: 99%

Structural robustness and timber buildings – a review

Huber

Ekevad

Girhammar

et al. 2018

Wood Material Science & Engineering

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Timber buildings are increasing in their dimensions. Structural robustness is imperative for all buildings and specifically important for tall buildings. Lives can be saved if disproportionate collapse can be avoided after a catastrophic event (e.g. accident, terrorism). The literature about robustness is comprehensive concerning concrete and steel buildings, but is rather limited regarding timber. This paper reviews robustness in general and robustness of timber buildings in particular. Robustness is an intrinsic structural property, enhancing global tolerance to local failures, regardless of the cause. A deterministic approach to assess robustness is to remove certain loadbearing elements from the structure and compare the consequences to given limits. Design methods for robustness may be direct by assessing effects of local failure, or indirect by following guidelines. For robust timber buildings, the connections are the key aspects. Usually, metal connectors may provide the required joint ductility. For robust light timber-frame construction, rim beams may be designed. For timber posts and beams and cross laminated timber, guidance regarding robustness is scarce, but in some aspects they seem to be similar to steel frames and precast concrete. Future research should assess the capacity of connections, and evaluate the adequacy of seismic connectors for robust timber buildings.

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Ductility in Timber Structures: Investigations on Over-Strength Factors

Cited by 9 publications

References 1 publication

Ductility and overstrength of nailed CLT hold-down connections

Ductility and overstrength of nailed CLT hold-down connections

Analytical Derivation and Experimental Verification of Overstrength Factors of Dowel-type Timber Connections for Capacity Design

Structural robustness and timber buildings – a review

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