San Diego Central Library A 64-foot long concrete gravity arch dominates the library’s main lobby. Concrete Gravity Arch An open feeling was desired at the library lobby, so a 64-foot (20-meter) long by 46-foot (14-meter) tall concrete gravity arch was designed from the ground level to the fourth floor, eliminating a column from the center of the lobby. Congestion of reinforcing steel at the two ends where the arch was to be supported by vertical columns proved a challenge. Couplers and headed
Pre-engineered metal building going up, showing the massive tapered red-iron columns being bolted to anchor bolts set in the slab. These heavy-duty webs were engineered to meet 180 mph wind loads required by local building codes. Perfect example of why red-iron framing is the go-to solution for strength, durability, and long-term performance. Learn more at BuckSteel.com. #SteelBuildings #MetalBuildings #BuildingErecting #RedIronBuildings #CommercialConstruction #SteelBuildingKits #BuckSteel

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