弯、剪、扭复合作用下的予应力工字梁，由于翘扭变形的存在，使得对它进行理论研究和实验研究非常困难。
Owing to the existing warping torsion, it has been rather difficult to make a theoretical and experimental study of the prestressed concrete I -beams under combined mixed torsion. flexure and shear.
应变测量基础——介绍应变，应力，印制板弯翘的概念以及应变片等。
Fundamentals of strain Measurement -definition of strain, stress, board flexure and strain gages.
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