Bridge Designing Based on the New Combined Stretch-Shear Deformation Formula

Shuanghua HUANG, Wenba HAN, Bingqing CAI, Jie WANG

Abstract


This paper discovered a phenomenon in which the mass point in unit cell cannot keep balance in current elastic theory. Under different stress states, the absolute values of all equilibrium stress on the mass point are greater than the absolute values of principal stress. Thus, based on new concept of point stress balance, this paper introduces the new formula of stretch-shear combined deformation. The new formula explains the issue that, in the state of stretch-shear, constructions destroy more easily than in the state of compress-shear. Besides, based on new concepts of point stress balance, this paper also establishes a new theory of strength that is much more accurate than the third and fourth strength theory, validated in the Damage Mechanics National Key Laboratory of Tsinghua University. Comparisons of experiment data show the errors calculated from the new theory are only 1%, while errors based on the third and fourth strength theory are 14.2% and 18.2%. Therefore, the author suggests using the new stretch-shear formula to solve problems in bridge engineering in the future.


Keywords


The balance of unit cell; Balance stress of mass point; Theory of strength; Bridge

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References


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DOI: http://dx.doi.org/10.3968/%25x

DOI (PDF): http://dx.doi.org/10.3968/%25x

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