A Dissipative Connector for CLT Buildings: Concept, Design and Testing

Area of Science:

• Structural Engineering
• Materials Science
• Timber Construction

Background:

• Cross-laminated timber (CLT) structures are susceptible to shear sliding failure, especially with large horizontal panels.
• Traditional connectors may not provide adequate dissipative capacity for seismic resilience in CLT.
• There is a need for innovative connections to improve the seismic performance of CLT buildings.

Purpose of the Study:

• To design and characterize a novel connection, the X-bracket, for enhancing the seismic performance of CLT panels.
• To evaluate the dissipative capacity and ductility of CLT structures utilizing the X-bracket.
• To assess the seismic resilience of CLT walls anchored with X-brackets.

Main Methods:

• Numerical parametric analyses were employed for the theoretical design of the X-bracket.
• Experimental cyclic tests were conducted to verify the connector's behavior.
• Numerical simulations of CLT walls with X-brackets were performed to evaluate seismic performance.

Main Results:

• The X-bracket was successfully designed and characterized, demonstrating adequate dissipative capacity.
• Experimental tests confirmed the cyclic behavior of the X-bracket, outperforming traditional connectors.
• Simulations showed improved seismic performance of CLT walls anchored with X-brackets, including squat walls.

Conclusions:

• The developed X-bracket connection significantly enhances ductility and energy dissipation in CLT structures.
• This innovative connector is effective even for large horizontal CLT panels and single-panel shear walls.
• The X-bracket offers a viable solution for improving the seismic resilience of timber construction.