并不是珍贵的木材，因为它们干燥时容易裂开和弯翘。
Are however, not valuable as timber because of their tendency to split and warp when dried.
说明采用七自由度单元的有限元法进行矩形截面简支梁的弯翘分析，有很高的精度，可以代替繁琐的解析解。
The result shows seven-freedom unit finite element method has high precision to analyse simple beam of rectangular section, it can replace complex analytic solution.
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.
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