Proposal for an equivalent strut model for Cross Laminated Timber infills in Reinforced concrete frames

In the field of seismic retrofitting, a recent development suggests introducing cross-laminated timber panels as infill within reinforced concrete frames. These panels are connected by metal dowels to improve the in-plane response of the structure. Comprehensive quantification of the mechanical behavior of the system has yet to be accomplished, as has the construction of simplified models for structural analysis, which is critical for wider use and comprehension of this technology. In this regard, the current study presents a framework for developing force-displacement relationships for single strut models of cross-laminated timber panels infilled in moment-resisting reinforced concrete frames using results from a detailed finite element model. Finally, a genetic algorithm-based optimization approach is implemented to calibrate two equivalent truss elements and preliminary results are presented.