Researchers at the National Institute of Standards and Technology (NIST) have developed five innovative new connection designs to improve the resilience of precast concrete structures. Precast concrete, where components like beams and columns are cast in a controlled factory setting and assembled on-site, offers many benefits including reduced construction costs and improved quality control. However, connection points between precast pieces are often the weakest links in a structure, and ensuring these connections can withstand sudden stress such as earthquakes or explosions is critical for building safety and durability.
NIST’s new connectors include a variety of robust designs such as welded metal plates, bolted brackets, and peg-in-hole steel rod systems. These were physically tested under rigorous conditions with sensors measuring forces and cracks, proving that they can better prevent disproportionate collapse—a dangerous failure mode where local damage leads to widespread structural failure. Collaborative efforts with the Precast Concrete Institute ensured the connections are not only stronger but also practical for manufacturing and assembly.
By balancing performance, cost, and constructability, these new connection methods promise to make precast concrete buildings more resilient to unexpected extreme forces, providing critical time during disasters for evacuation and injury prevention. This advancement builds on decades of research to mitigate catastrophic collapses seen in historical events, offering the precast concrete industry vital pathways toward safer, more reliable construction.
Read the entire article on the NIST website here.