Each quadrangular mesh should be braced by cables in order to increase the planar shear stiffness.In other words, grid shells are composite structures formed by flexible cables and stiff bars.

• 为提高四边形网格单元的面内剪切刚度,在每个四边形网格面内还设置了对角向的交叉支撑索,使得结构整体成为一种由刚性梁单元和柔性索单元共同组成的混合结构。