用CAD法设计和制造了复合式矩型截面聚能器；
The energy complex collecting unit with retangle cross section is designed by CAD and also manufactured.
目前，箱型截面广泛应用于连续梁、连续刚构、斜拉桥等桥梁结构中。
At present, the widely used box section beam, rigid frame, cable-stayed Bridges and other structures.
并讨论了“圆型截面桩”与“矩形截面桩”极限阻力计算公式的近似转换。
Then the relationship of the ultimate resistance between round section pile and rectangle section pile is investigated.
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