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把正交正放类平板网架假设为由３层不同性质材料组成的各向正交异性夹层板，根据考虑剪切变形的具有３个广义位移的平板振动理论对其固有振动问题进行了研究，利用双三角函数为试函数，推导得出了周边简支边界条件下该类网架结构固有振动的精确解
Orthogonal normal plate-like plate grid is assumed to be an orthotropic plate composed of three layers of different materials. The natural vibration problem is studied based on plate vibration theory with three generalized displacements considering shear deformation. Using the double trigonometric function as a trial function, an exact solution to the natural vibration of this kind of lattice structure under the condition of the simply supported boundary is deduced.