A component approach for the hysteretic behaviour of connections in cross‐laminated wooden structures

Abstract

SUMMARY In this paper, a numerical model to estimate the dissipative capacity and describe the cyclic response of cross‐laminated (X‐lam) timber buildings is presented. The connections between panels and to the foundation (metal hold‐downs and angle brackets, and screwed connectors) are modelled with nonlinear hysteretic multispring elements taking into account the strength interaction between different degrees of freedom according to a predefined domain. The timber components (solid X‐lam floors and wall panels) are modelled using elastic shell elements. By calibration on experimental cyclic tests carried out on each degree of freedom, important features of timber connection behaviour such as post‐peak strength, pinching and stiffness degradation can all be considered. In addition, the effect of friction at the interface between panels and with foundation can be taken into account. These springs have been implemented as external subroutines in a widespread software package such as Abaqus. By comparison with the experimental results of cyclic tests carried out on single X‐lam walls, coupled X‐lam walls and a single‐storey X‐lam building, the accuracy of the proposed model is demonstrated. Copyright © 2013 John Wiley & Sons, Ltd.

Non-linear modelling of the in-plane seismic behaviour of timber Blockhaus log-walls

“…7a), which is proportional to the dissipated energy in the last full reversed cycle and can be set through the parameters a and c in Table 3. Further details can be found in [23]. The axial relationship needs only three parameters to be defined: tension and compression stiffnesses, and the ultimate compressive displacement, so that possible crushing mechanisms in the carpentry joints could be taken into account.…”

Cyclic behavior of typical screwed connections for cross-laminated (CLT) structures

“…Thus, understanding the cyclic behaviour of connections in CLT buildings is crucial for their seismic design. Experimental values are also needed to feed advanced (Rinaldin et al 2013) and simplified (Follesa et al 2013) numerical models for seismic analyses of CLT structures.…”

Performance of semirigid timber frame with Lagscrewbolt connections: experimental, analytical, and numerical model results

“…Modeling of the connection can be achieved with complex continuum or simplified spring models (e.g., Lowes et al 2004;Kouris et al 2014;Komatsu 2005a, b, 2006). The hysteretic model considered can vary from a full characterization of the embedment properties of the bolts (e.g., Foschi 2000;Nakatani and Komatsu 2006) to macroscopic phenomenological approach of the connections (e.g., Rinaldin et al 2013;Shen et al 2013). In this paper, first, analytical models for the details of the LSB connections, derived in Komatsu (2005a, b, 2006), are provided.…”