Ludwig Mann (engineer)

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Ludwig Mann (born September 1, 1871 in Cologne , † February 27, 1959 in Leipzig ) was a German civil engineer.

Mann went to the humanistic grammar school in Wiesbaden and studied civil engineering from 1892 to 1894 at the TH Hannover and in 1895 at the TH Berlin-Charlottenburg , where he was a student of Heinrich Müller-Breslau . After completing his military service, he worked as a civil engineer in an engineering office in Berlin from 1895. In 1900 he took over the construction planning and construction management for the construction of the Tegel gasworks on behalf of the Magistrate of Greater Berlin. He also developed a theory of circularly symmetrical spatial structural structures (published in 1911), inspired by the design of a tent roof 76 m in diameter for the gas works. In 1906 he was appointed senior engineer at Müller-Breslau and was entrusted with the management of the laboratory and with earth pressure tests (which led to the Müller-Breslau earth pressure tables). In 1909 he received his doctorate. The dissertation static calculation of rigid quadrangular networks was groundbreaking for the use of the difference method in structural engineering. It also contained the so-called Mann formula for verifying the stability of frame supports. In 1910 he became professor of mechanics (Faculty of General Sciences) at the then newly founded Technical University in Wroclaw and later he also took over the chair for structural engineering (Faculty of Civil Engineering). His research led to his book on the theory of framework structures, which appeared in 1927 and contained important new calculation methods. In the 1920s he was twice rector of the TH Breslau and he was dean of the faculty for general sciences.

From 1920 he dealt with the construction of large equipment (such as overburden conveyor bridges 150 to 200 m in length) in lignite mining and advised the lignite industry. He developed new methods for their static calculation ( spatial force transverse method for spatial structures). In 1928 he became a consultant to the Bublag company in Mückenberg and in 1932 he became a state appraiser for large waste equipment and conveyor bridges. In 1941 he retired and in 1945 he fled Silesia. In Leipzig he was again a state expert and head of an engineering office until 1954 for the static testing of large devices in the lignite industry.

His many contributions to statics also included the comparison of the force variable method with the path variable method , which he presented in 1927 with reference to the analytical mechanics of Lagrange , which he drew attention to again in an article in 1958 on the occasion of the award of an honorary doctorate from the TH Dresden, whereby he also clearly demonstrated the duality of both methods. In 1939 he expanded the path size method to include the calculation of spatial frameworks.

In 1957 he received an honorary doctorate from the TH Dresden and in 1954 he became an honorary senator at the University of Construction in Leipzig.

Fonts

  • Static calculation of rigid square nets, Zeitschrift für Bauwesen , Volume 54, 1909, p. 539
  • About cyclical symmetry in statics with application to the spatial framework, Der Eisenbau, Volume 2, 1911, pp. 18-27
  • Theory of framework structures on a new basis, Springer 1927
  • Basics of the theory of spatial framework structures, steel construction , Volume 12, 1939, pp. 145–149, 153–158
  • Comparison of the principles and terms of the development of force and deformation methods in statics, Bauplanung-Bautechnik, Volume 12, 1958, pp. 12–15

literature

Individual evidence

  1. ^ Karl-Eugen Kurrer: The History of the Theory of Structures. Searching for Equilibrium . Berlin: Ernst & Sohn 2018, pp. 808f., ISBN 978-3-433-03229-9 .
personal data
SURNAME Man, Ludwig
BRIEF DESCRIPTION German civil engineer
DATE OF BIRTH September 1, 1871
PLACE OF BIRTH Cologne
DATE OF DEATH February 27, 1959
Place of death Leipzig