DEVELOPMENT OF DOUBLE DIAGONAL TRUSS BRIDGES BY RAILWAY BUREAU OF THE GOVERNMENT-GENERAL OF CHOSEN AND THEIR AIR RAID RESISTANT PERFORMANCE

Abstract

 Double diagonal truss bridges in the Korean Peninsula during the end of World War II were newly developed as an air raid (bombing) resistant structural type by Railway Bureau of the Government-General of Chosen, Japan. The development and the construction were summarized based on memoirs by engineers of Railway Bureau and technical magazines before 1940, including the newly discovered original drawings. To improve the air raid resistant performance, diversity (combination) of different technologies such as internal and external statically-indeterminant, suspension structure and etc. was strongly recommended. Finally the process of design and construction of Yalu river bridge between China and North Korea and its air raid resistant performance were described.