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

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

Ämnesord

Engineering and Technology  (hsv)

Civil Engineering  (hsv)

Other Civil Engineering  (hsv)

Teknik och teknologier  (hsv)

Samhällsbyggnadsteknik  (hsv)

Annan samhällsbyggnadsteknik  (hsv)

Mechanical Engineering  (hsv)

Other Mechanical Engineering  (hsv)

Maskinteknik  (hsv)

Annan maskinteknik  (hsv)

Agricultural and Veterinary sciences  (hsv)

Agricultural Science, Forestry and Fisheries  (hsv)

Wood Science  (hsv)

Lantbruksvetenskap och veterinärmedicin  (hsv)

Lantbruksvetenskap, skogsbruk och fiske  (hsv)

Trävetenskap  (hsv)

Träteknik  (ltu)

Wood Science and Engineering  (ltu)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

mass timber buildings

structural robustness

high fidelity model

progressive collapse

structural integrity

component model