Lock-Up Device (LUD)

A Lock-up Device (LUD) is a simple connection device used to join two adjacent structural elements, particularly in bridge structures. Its primary purpose is to effectively handle sudden dynamic loads during seismic events. When subjected to such loads, the LUD locks up excessive displacement and transmits the load through the structure, ensuring its stability. Once the seismic action subsides, the LUD returns to its original position and resumes its normal functionality.

In recent developments, there are bearings designed with LUD functionality, combining the benefits of both LUD and conventional structural bearings like pot bearings or spherical bearings. This innovative approach is particularly suitable for bridges located in seismic zones, as it provides cost-saving advantages while still addressing the need for seismic mitigation. By integrating the LUD with the bearing, the overall volume is reduced, making installation, maintenance, and replacement more practical and convenient.

An exploded view of pot bearings with LUD

Section view of guided and free sliding of bearings with LUD

Mass production of Bearings with LUD at IEC workshop

Consult IEC for more details or catalog.