Take the first crosssection as an example, and the calculation formula of flexural capacity of composite beams is obtained by using the error transfer formula of mathematical statistics.
运用数理统计学的误差传递公式，推导出了组合梁截面抗弯承载力统计参数的计算公式（以第一类截面为例）。
2
A laminated composite bar of rectangular crosssection consists of a middle portion of one material as well as upper and lower identical cover plates of another material.
一矩形横截面的叠层复合材料杆，由以一种材料为中心部分，及另一种材料的上下两相同的盖板所组成。
3
Gucheng bridge is a steel tube concrete bowstring arch and variable crosssection continuous beam composite system through bridge with single load plate.