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This paper proposes a method enabling to compute the
prestressing strand resistance using the strain measured on only one core wire.
Numerical analysis is conducted considering the pitch length of the strand and
the diameters of the core wire and helical wires as parameters. The results
verify that the relation between the stresses of the core wire and helical
wires can be expressed in terms of the helical angle. Based on this
observation, a formula computing directly the prestress force in the strand
from the strain measured in the core wire is suggested. Owing to the recently
developed measurement method for the core wire strain, the proposed formula can
be exploited to determine the prestress of the strand.
The teaching strategy
plays an important part in the effectiveness of the college English teaching. After
comparing the current college English teaching strategies in China, this paper
attempts to analyze the process teaching strategies and the cognitive teaching
strategies of the novice, the proficient and the expert college English
teachers at different teaching stages of teaching and proposes the optimizing
path of the teaching strategies. This helps make up for the lack of research of
enhancing the college English teaching strategies inChina.