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It was, however, concluded that both failures were the consequences of poor quality labor.
With the increase in demand of construction standardization, innovative reinforcing systems such as Kahn's were pushed to the side in favor of the concrete reinforcing systems seen today. Modern requirements for deformations were established in "Tentative Specifications for the Deformations of Deformed Steel Bars for Concrete Reinforcement", ASTM A305-47T.
One of these, the Alvord Lake Bridge in San Francisco's Golden Gate Park, was the first reinforced concrete bridge built in the United States. Furthermore, Turner warned that Kahn's system could result in a brittle failure as it did not have longitudinal reinforcement in the beams at the columns.
This type of failure unfortunately manifested itself in the partial collapse of the Bixby Hotel in Long Beach, California and total collapse of the Eastman Kodak Building in Rochester, New York, both during construction in 1906.
As a French gardener, Monier patented reinforced concrete flower pots in 1867, before proceeding to build reinforced concrete water tanks and bridges. Ransome, an English engineer and architect who worked in the United States, made a very significant contribution to the development of reinforcing bars in concrete construction. Turner was designing his "mushroom system" of reinforced concrete floor slabs with smooth round rods and Julius Kahn (inventor) was experimenting with an innovative rolled diamond-shaped rebar with flat-plate flanges angled upwards at 45° (patented in 1902).
He invented twisted iron rebars, which he initially thought of while designing self-supporting sidewalks for the Masonic Hall at Sockton, California. Kahn predicted concrete beams with this reinforcing system would act in bending like a Warren Truss, and also thought of these rebars as shear reinforcement.
These include Joseph-Louis Lambot of France, who built reinforced concrete boats in Paris (1854) and Thaddeus Hyatt of the United States, who produced and tested reinforced concrete beams.