Bridge dampers (double steel pipe dampers, J-UP braces)
As a seismic control component, this method absorbs seismic energy by installing it in arch bridges and frame bridges, thereby improving the seismic performance of the bridge.
●Double Steel Pipe Brace The double steel pipe brace consists of a damper made of steel pipes, with the axial force pipe using low yield point steel (JFE-LY225S). The outer pipe (reinforcing pipe) is structured to restrain the buckling of the axial force pipe. The double steel pipe brace can undergo plastic deformation of the axial force pipe without buckling during compression, providing stable energy absorption capability against repeated earthquakes. ●J-UP Brace The J-UP brace is a buckling-restrained brace that sandwiches a core material transmitting axial force between a pair of steel mortar plates, demonstrating stable restoring force characteristics even in high strain regions.
basic information
Double Steel Pipe Damper ● A lightweight and compact seismic and vibration control brace made entirely of steel materials. ● It functions as an elastic component under normal conditions and yields plastically ahead of the main structural components during level 2 seismic motions, absorbing seismic energy. ● The axial force pipe uses low yield point steel (JFE-LY225S) with excellent repeated elongation characteristics. ● It undergoes plastic deformation without buckling during compression and has stable hysteresis characteristics in a spindle shape. ● It has obtained general evaluation for buildings.
Price range
P4
Delivery Time
OTHER
Due to the procurement period of low yield point steel (6 to 8 months).
Model number/Brand name
Double steel pipe brace
Applications/Examples of results
● Shinetsu Expressway Ota Kirikawa Bridge (Steel Superstructure) Construction Buckling-restrained braces, double steel pipe braces, 32 units Steel arch-type inverted rose bridge Installation: Lower lateral structure of the arch Cumulative displacement recorders, 2 units ● Yokohama-Yokosuka Road Tanaura Second Viaduct Seismic Reinforcement Construction Buckling-restrained braces, double steel pipe braces, 48 units Steel Hojō frame bridge Installation: Diagonal members of the frame legs Cumulative displacement recorders, 4 units, maximum displacement recorders, 12 units ● Cumulative Displacement Recorders Devices that record the cumulative displacement of buckling-restrained braces due to earthquakes (non-powered). They quantify the plasticization level of the buckling-restrained braces and help determine the appropriate timing for damper replacement.
