Methods for practice-oriented linear analysis in seismic design of Cross Laminated Timber buildings

Abstract

In the context of innovative seismic-resistant structures, Cross Laminated Timber (CLT) construction holds an important position at a global level, supported by important full-scale tests and studies of the non-linear behaviour of these structures for severe events, demonstrating excellent performance. The present study aims to transfer current knowledge in the form of modelling approaches applicable to design engineers presenting tools and methodologies pertinent to the daily procedures of professional practice, thus relating to linear static and dynamic analyses. Two different approaches of structural modelling are presented, validated and compared; one that is based on a distributed representation of the connections between the structural panels and a second that is based on a discrete representation. Both models are validated by comparing the time-history responses with the full-scale shake-table test results of a 3-storey CLT structure under three earthquakes, showing in both cases a reliable estimate of the structural response. Finally, a parametric study for the damping coefficient of the structural response is presented and the typical value of 5% is evaluated. It is shown that values greater than 5% can be more applicable in order to compensate for the influence of the friction developed primarily between wall and floor panels on the global energy dissipation capacity of the structure.