Optimising welded connections

Unpacking the complexity of welded connections.

Our research aims to optimise welded joint details in order to make fabrication more cost-effective while ensuring adequate performance of the connection in-service and specifically under seismic loading. 

The main challenge is the high level of complexity involved in some welded connections of which proposed partial penetration butt welds instead of the traditional full penetration welds are explored.

This research introduces the “effective full penetration butt weld” (EFPBW), a new type of partial penetration weld that offers the same performance as CPBWs but at a significantly lower cost. The EFPBW can replace CPBWs in moment-resisting frames and similar connections, following the guidelines provided.

Review of bolts

Investigating how bolts can be better utilised.

Our research into welded connections is also exploring how high-strength bolts can be better utilised to enhance the performance and efficiency of structural connections. 

We’re investigating the installation of HSFG PC 8.8 bolts, particularly in moment end plates, which may lead to relaxed requirements in NZS 3404, simplifying installation without compromising safety. 

We’re also examining the use of classes higher than 8.8, such as 10.9 and 12.9 which are becoming more commonly used despite their installation and performance not having been researched thoroughly to be following the 8.8’s procedure.

Optimising eccentric cleats in MRFs

Providing guidance on eccentric cleats and beam column connections.

Designing effective beam-column connections is essential for ensuring the safety and performance of moment-resisting frames (MRFs). 

Our research delves into optimising eccentric cleats in compression and refining column stiffeners and panel zones based on the latest NZS 3404 amendment 2 standards. By providing step-by-step guidance and practical examples, this work equips engineers with the tools to enhance their skills, ensuring that structures are both cost-effective and resilient in seismic conditions.