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Japanese professor of civil engineering and pioneer of structural theory.

Biographical Information

Name: Keiichi Hayashi
Born on 2 July 1879 in , Joetsu, Niigata, Japan, Asia
Deceased on 2 August 1957 in , Tokyo, Japan, Asia

Short biography of Keiichi Hayashi

Keiichi Hayashi was educated at the 1st state grammar school in Tokyo and afterwards studied at the Imperial University in Kyoto from 1900 to 1903. He gained his first practical engineering experience as a mining engineer at the Sumitomo-Bessi Mine. In 1912 he was awarded a doctorate by the Imperial University in Kyoto for his dissertation On Beams on an Elastic Bed. From 1912 to 1917 he was visiting professor at the Imperial Kyushu University in Fukuoka and during this period undertook study tours of Germany, the UK and the USA. January 1917 saw him appointed professor of the 5th chair of building materials and building operations at the Faculty of Civil Engineering at the Imperial Kyushu University in Fukuoka. He was given the title of honorary professor at the same university in 1939. Hayashi's investigation (1912) of the beam on an elastic bed and its application in civil engineering was the first of its kind. His mathematical tables of higher functions proved invaluable to civil engineers during the invention and innovation phases of structural theory. However, physics – and not just the theory of structures – also benefited. For example, in his guest appearance at the Imperial Kyushu University in Fukuoka in November 1922, Albert Einstein paid thanks to Prof. Hayashi, saying that the hyperbola functions had been very useful to him.

Main contributions to structural analysis:

Theory of beams on an elastic bed and their application to civil engineering [1921/1]; Five-figure tables of trigonometric and hyperbolic functions as well as the functions e x and e –x using natural numbers as an argument [1921/2]; Five-figure tables of trigonometric and hyperbolic functions [1921/3]; Seven- and multi-figure tables of trigonometric and hyperbolic functions [1926]; Tables of Bessel, theta, spherical and other functions [1930/1]; Five-figure function tables, trigonometric, inverse trigonometric, exponential, hyperbolic, spherical, Bessel, elliptical functions, theta zero values, natural logarithms, gamma functions [1930/2]; Tables of Bessel functions [1936]

Source: Kurrer, Karl-Eugen The History of the Theory of Structures, Wilhelm Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH, Berlin (Deutschland), ISBN 3-433-01838-3, 2008; p. 735/736


  1. Watanabe, Eiichi / Hayashi, Keiichi / Takenaka, Hirofumi / Nakai, Hiroshi (1988): On Creep And Relaxation Of Composite Girders With Precast Prestressed Concrete Slabs. In: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1988, n. 392 (April 1988), pp. 93-101.


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