[提要]  根据结构等效原则推导出空腹网架拟交叉梁系法中折算剪切刚度的计算公式。该式考虑了面板的作用和上、下弦层构件不对称的影响，扩大了空腹网架拟交叉梁系法的适用范围。还提供了一个空腹夹层板的折算剪切刚度计算式，除考虑上述因素外，还计及了剪力键的剪切变形影响，不仅适用于空腹夹层板的I型板，还适用于Ⅱ型板。分析表明，公式均具有较好的精度。
[关键词]  空腹网架 空腹夹层板 折算剪切刚度

A new equivalent shear strength formula for open-web lattice grids by using intersection beam analogy
method is developed. The effects of upper slabs and unsylnmetrical section are considered in the formula. It can be used to analysis common open-web lattice grids. An equivalent shear strength formula for open-web sandwich plate is also given by using sandwich plate analogy method, in which the effect of shear strain of blocks is considered. Examples show the formulae have higher accuracy.
Keywords: open-web lattice grids; open-web sandwich plate; equivalent shear strength