You would think the drawings above are a result of American engineering.
The sleeved column braces as earthquake-proof technology were invented by Mr. Sridhara, a structural engineer in Bangalore, India and patented by Bangalore Benne Narasimhamurthy Sridhara.
The sturdy brace apparatus is simple, yet effective. It surrounds a core of high-performance steel, but is spaced from the sides of the core. The sleeve absorbs and dissipates energy, but doesn’t buckle under pressure.
Conventional braces, which do not have sleeved material for absorbing energy, can even buckle under an earthquake measuring 5 on the Richter scale, according to Mr. Sridhara.
Star Seismic, CoreBrace and other steel fabricators in the U.S. import the components via a substantial royalty. Star Seismic and CoreBrace are perfectly capable of manufacturing the braces in the U.S. instead of importing them from Japan’s Nippon Steel, the world second largest steelmaker.
According to AGC, “Despite getting a U.S. patten in 2000 for sleeved column braces, the light of Mr. Sridhara's invention was hidden under a bushel.”
"This is a mystery that would be interesting to delve into," says Val Tuhari of Construction Advisory Group.