THE HIGH-DUCTILITY CLASS (DC3) DESIGN PROCEDURE IN THE NEW EUROCODE 8 FOR CLT BUILDINGS: A CASE STUDY

This study aims to discuss the high ductility (DC3) design procedure for Cross-Laminated Timber (CLT) multi-storey buildings included in the draft document of the second generation of Eurocode 8. Through the analysis of the individual steps, possible issues in the interpretation and application of the rules of the DC3 design protocol are highlighted and resolved. Furthermore, a new method for medium ductility design (DC2+) is proposed; the goal is to define a simplified calculation method for segmented walls that allows the use of a higher behaviour factor than the one proposed for the DC2 and a lower computational burden than the DC3. The main steps of this phase have been the verification of the proposed behaviour factor through a pushover analysis on various single wall structural archetypes, and the impact of the new method on the connection design and on the computational demand.