→ jtouch:改成前4列給外賓坐 (修課學生從第5列開始坐) 12/11 12:04
因為外賓比較多
前面3列都要空出來.
要請假的人請本週三前告知.
* 若來不及排座位表, 請修課同學由第3列開始自由入座
先到的人, 請從前面中間開始坐~
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Torsion of RC Members -A Historical Overview
by
Thomas T. C. Hsu
Moores Professor of Civil Engineering
Dept. of Civil & Environmental Engineering
University of Houston, Houston, Texas, USA
Abstract
This presentation provides a historical overview of how the knowledge
of torsion in reinforced concrete was developed from 1826 to the present
time (2008). The classical theories of torsion of homogeneous beams include
those of Navier (1826) and Bredt (1896). Navier’s three principles of
mechanics of materials (equilibrium, compatibility and constitutive laws
of materials) and Bredt’s thin-tube theory guided the torsion research
of reinforced concrete members throughout the 20th century.
Research in torsion of reinforced concrete started with the space
truss model of Rausch (1929). During the last 40 years of the 20th century,
two approaches have been developed, first the skew-bending theories and
later the truss models with membrane elements. The former included the
theories of Lessiq (1959), Yudin (1962), Collins (1965), Hsu (1968),
and Elfgren (1972). The latter included the theories of Lampert and
Thurlimann (1969), Elfgren (1974), Collins and Mitchell (1980), and
Hsu and Mo (1985). The development of these modern truss models continued
to be strongly guided by Navier's three principles. For shear and torsion,
the three principles are: Mohr's stress circle, Mohr’s strain circle, and
the “softened” stress-strain curve of concrete.
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