Innovative thinking in engineering .The first pre-stressed RC structure was the grandstand of Caracas,Venezuela.1954 ● The cantilever was 27m and the shell thickness was just 7.5cm. The quality of pre-stressed cantilever shell structure is so reliable that T.Y.tested it by jumping at the cantilever tip in 1984,it performed safe and stable.Innovative thinking in engineering • . The first pre-stressed RC structure was the grandstand of Caracas,Venezuela.1954 • The cantilever was 27m and the shell thickness was just 7.5cm. • The quality of pre-stressed cantilever shell structure is so reliable that T.Y. tested it by jumping at the cantilever tip in 1984, it performed safe and stable