About the product
A Lock Up Device (LUD) is a plasto-elastic unit that provides the engineer a simple method of temporarily creating a fixed connection, when desirable, that otherwise would remain as a moveable connection. The device is sometimes referred to as a shock transmission unit or LUD. The device is connected to either side of adjoining structures or between elements of structures, where expansion and contraction occur. Upon a sudden dynamic load, the device locks up and transmits the load through the structure. In effect, the device creates a rigid link within a fraction of a second and is modeled as a fixed connection during the shock loading. Once the shock load is removed, the device reverts to its benign influence and the structure behaves in a normal manner. The LUD does accommodate all slow movements associated with a bridge structure such as thermal movement, shrinkage, and creep.
STU/LUD Design Requirements
Every Seismic Device project is different, the following are details TechStar Engineer’s need to design and quote the Seismic Device for this project.
Rate of expansion and contraction during normal operation
Total stroke (mm, in.) of the transmission rod through full range of normal movement
Ultimate design force to be transmitted through the LUD
Geometry of the surrounding application
Design code that is applicable
Preference in corrosion protection
STU/LUD Design Requirements
Every Seismic Device project is different, the following are details TechStar Engineer’s need to design and quote the Seismic Device for this project.
Rate of expansion and contraction during normal operation
Total stroke (mm, in.) of the transmission rod through full range of normal movement
Ultimate design force to be transmitted through the LUD
Geometry of the surrounding application
Design code that is applicable
Preference in corrosion protection
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