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UBB™ is a structural brace element consisting of a steel core plate which is restrained by mortar and steel tube. A membrane called the unbonding material, located between the mortar and the core plate, ensures that axial forces in the core plate do not transfer to the mortar and the steel tube. This ingenious combination of components produces stable and symmetric tension-compression hysteretic behavior.
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The base isolation U-shaped damper is a new steel damper fabricated from high-quality rolled steel (SN940B). Some of its excellent characteristics include high quality, high level of design freedom, nonorientation, low cost, and ease of inspection.
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