making of boxes造句

when whole analysis is carried through the beam-lattice method and bridge surface is made of box beams with one box and two cells, according to the principle of constant bending rigidity and every part revolving the same neutral axis, a box beam can be simplified into three beams in the places of corresponding webs . thus effective transfer of shearing force can be ensured, and global property can be reached through that of three beams, this kind of method is simple and is able to ensure engineering precision; secondly, the paper is based on elastic theory, adopts finite element method and carries through the first kind stability analysis towards zhongshan no . one bridge
在选用梁格法进行整体分析时，遇到桥面系是单箱双室的箱型梁时，按照抗弯刚度不变且各部分绕着同一中性轴的原则，将一个箱型梁在相应的腹板处简化成3根梁，能够保证剪力的有效传递，而且可以由这划分的3根梁的性能得到箱型梁结构的总性能，这种方法简便易行且能保证工程精度；其次，本文基于弹性理论，采用有限元法对中山一桥进行了第一类稳定分析。
It's difficult to find making of boxes in a sentence. 用making of boxes造句挺难的