The Origins of Prestressing: Freyssinet, Magnel, and Finsterwalder

Description: Themes: Evolution of prestressed concrete from reinforced concrete; Eugene Freyssinet's study of large-span reinforced concrete arches and concrete ""creep""; Gustave Magnel's Sclayn Bridge and Walnut Lane Bridge; Ulrich Finsterwalder takes prestressed concrete to a new level with Mangfall Bridge and the cantilever construction method.

Learning Objectives: Students should be able to: Define pretressing from a scientific perspective; Describe the origins of prestressing from a social perpsective; Illustrate the new bridge forms possible due to prestressing from a symbolic perspective; Relate the development of new materials (from iron and steel to reinforced concrete and finally prestressed concrete) to the new structural forms made possible by them; Predict where to place the steel bars in a reinforced concrete bar used as a beam, and as a horizontal cantilever; Explain why prestressing concrete increases its strength; Explain how prestressed concrete allows for long spanning and thin deck concrete bridges without using an arch form; Define creep and explain how prestressed concrete must be modified to account for the role of creep; Describe the role fo Freyssinet in the development of prestressed concrete

Keywords:  reinforced concrete, prestressed concrete, Freyssinet, Finsterwalder, Magnel, arched bridge, creep, cantilever construction, Luzancy Bridge, Plougastel Bridge, Mangfall Bridge

Categories: Structural EngineeringPrinceton University, Bridges

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