Shock Transmission Unit (STU)

ACTS-SDT offers Shock Transmission Unit (STU) features a “slow-move, fast-lock” mechanism. Under normal conditions, it allows slow movements caused by temperature changes or creep, thereby preventing restraint stresses.When earthquakes or sudden external forces occur, the STU instantly locks the structural connection, effectively transferring horizontal forces to the main supporting components.By utilizing high-viscosity fluid and piston action to control its mechanical behavior, the STU serves as a reliable seismic protection device for bridges and base-isolated buildings, ensuring both safety and long-term durability.