As a seismic control component, this method absorbs seismic energy by installing it in arch bridges and rigid-frame bridges, thereby improving the seismic performance of the bridge.
●Double Steel Pipe Brace The damper consists of steel pipes, with the axial force pipe made of 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 without buckling during compression and has stable energy absorption capacity 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.
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basic information
Double Steel Pipe Damper ● A lightweight and compact seismic and vibration control brace composed solely of steel materials. ● It functions as an elastic member under normal conditions and yields plastically before the main structural members during level 2 seismic motion, 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, exhibiting stable hysteresis characteristics in a spindle shape. ● It has obtained a general evaluation for buildings.
Price range
P4
Delivery Time
※Due to the procurement period of low yield point steel (6 to 8 months).
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: Arch section, lower lateral structure 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 gauges, 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, allowing for the determination of the appropriate timing for damper replacement.
Detailed information
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Shinetsu Expressway Ota Kirikawa Bridge (Steel Superstructure) Construction Steel Arch Reverse Rose Bridge 32 Double Steel Pipe Dampers
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Yokohama Yokosuka Road, Tanaura Second Viaduct Seismic Reinforcement Work Steel Hojō Frame Bridge 48 Double Steel Pipe Dampers
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Company information
JFE Civil Corporation has been developing its business in various fields based on its achievements and technical capabilities in maintaining JFE Steel's steelworks for many years. We deliver valuable business from planning to construction and maintenance support. We are the only general construction company in the JFE Group.