When did the reinforced concrete structure appear?

Modern concrete structure is developed with the development of cement and steel industry, with a history of about 150 years. 1824, an Englishman Joseph Astin invented portland cement and obtained a patent. 1850, Frenchman L. Lambo built a boat with barbed wire cement mortar; 186 1 year, Frenchman Joseph maunier obtained a patent for manufacturing reinforced concrete slabs, pipes and arch bridges.

German Koenen and Wayss published the calculation theory and method in 1886, and Wayss and J.Bauschinger published the test results in 1887. Wayss and others put forward the concept that steel bars should be arranged in tension zone and the calculation method of plates. After that, the popularization and application of reinforced concrete developed rapidly. In 189 1 ~ 1894, European researchers published some theoretical and experimental research results, but in the whole 50 years from 1850 to 1900, engineers regarded the construction and design methods of reinforced concrete as trade secrets, so generally speaking,

In the United States, Thaddens Hyatt conducted experiments on reinforced concrete beams at 1850, but his research results were not known until 1877; E.L.Ransome used some forms of reinforced concrete in the early 1970s in 19, and became the first person to use deformed (twisted) steel bars in 1884, and obtained a patent. 1890, Ransome built a two-story reinforced concrete art museum in San Francisco, which was 95m long. Since then, reinforced concrete has developed rapidly in America.