The principle of functioning of STU is to explote the force generated by flowing the internal fluid through an orifice resulting in two situations:

Service: when loads are slowly applied due to temperature changes or other causes, STU allows the structure to move freely.

Earthquake or other events: when loads are rapidly applied due to earthquake, windstorms or vehicle braking actions, STU acts as a rigid link connecting the elements of the structure.

Upon request, our Technical Department can tailor Well-Link STU with:

Load capacity: 50 – 600 ton
Stroke: 12 – 200 mm
Min activation velocity value: 2 mm/sec

1. Customized design can be made according to the requirements and structure properties.
2. Low temperature dependence.
3. Suitable for slow motions and dynamic actions.
4. Excellent durability and virtually maintenance-free.
5. Easy for installation.

STU is used to distribute, reduce or transfer loads between elements of a structure. It is normally applied in infrastructure (both new and existing) such as bridges, viaducts or railways, but can also be applied in buildings.

When installed, the STU shortens and elongates along the bridge, and the STU locks the bridge with the pier and abutment during earthquake.

1. Cylinder: Based on S45C or equivalent
2. Piston Rod and Pin: Based on ASTM A240, ASTM A564 type 630 or equivalent
3. Internal Fluid: Silicon-based fluid or putty
4. Brackets: S355JR or ASTM A572 Gr.50 or equivalent
5. Anchor Bolts: ENV 1993-1-1 Gr. 10.9 or above
6. Corrosion protection: Metal parts directly exposed to the ambient are protected by unsealed zinc coating with a thickness of 150 μm as per ISO14713

Unit: kN-mm