Innovative technology helps buildings bounce back after earthquakes

New research from the University of Auckland has demonstrated that timber buildings can not only withstand major earthquakes but also return to their original position afterward – thanks to an innovative new technology designed to improve seismic resilience.

Researchers in the Faculty of Engineering and Design recently conducted a one-of-a-kind, full-scale earthquake test on a two-storey timber structure in New Zealand. The test demonstrated that buildings made entirely of wood can be designed to be both earthquake-resilient and sustainable.

PhD candidate Soheil Assadi says the study has significant real-world implications, particularly for essential infrastructure.

“If this were a school or a hospital, it could be used immediately after an earthquake. This solution could not only save lives, but also ensure that buildings remain functional, reducing economic losses and recovery time.”

The test incorporated a cutting-edge technology known as the Resilient Slip Friction Joint (RSFJ) developed at the University, a type of damper that not only absorbs seismic energy but also helps the building recentre itself after shaking.

A damper works similarly to a car's shock absorbers, reducing movement during an earthquake by dissipating energy. Most dampers only reduce shaking, but the RSFJ developed at the University also ensures the building returns to its original position, preventing it from remaining tilted or misaligned.

During the testing, the full-scale timber structure was subjected to extreme seismic forces, simulating a major earthquake. Remarkably, the structure withstood the shaking and showed no signs of damage.

Dr Ashkan Hashemi, who co-led the project, says that while Aotearoa New Zealand needs more sustainable and environmentally friendly construction to meet our net zero carbon targets, there is still a lack of confidence in the earthquake resilience of timber buildings.

“This research shows that with innovative design, we can build strong, sustainable and cost-effective timber structures that perform exceptionally well in earthquakes.

“It's amazing what you can achieve with a bit of innovation and thinking outside the box.”

The developed solution is now ready for adoption in industry and real-life projects, say the research team, which also includes Professor Pierre Quenneville and PhD candidate Setu Agarwal.

The project was funded by the Wood Industry Development and Education (WIDE) Trust, with support from Te Hiranga Rū QuakeCoRE (NZ Centre for Earthquake Resilience).