Finite element analysis of alternative load paths to prevent disproportionate collapse in platform-type CLT floor systems

Multi-storey buildings require mitigation of consequences unexpected or accidental events, to prevent disproportionate collapse after an initial damage. Cross-laminated timber (CLT) in platform-type construction is increasingly used for multi-storey buildings, however, the behaviour and alternative load paths (ALPs) are not fully understood. A 3D non-linear component-based finite element model was developed a CLT floor system study ALPs internal wall loss, pushdown analysis. The model, which accounted connection failure, crushing large displacements, calibrated experimental results then adapted boundary conditions corresponding typical residential office buildings. Subsequently, five parameters (floor span, type, vertical location floor, tying level, horizontal stiffness) were varied, their effects on 80 models. showed that three occurred, catenary action most dominant. Collapse resistance mainly affected by followed axial strength, stiffness ductility floor-to-floor connection, weight level above panel thickness. This provides approach design resistant