The advantages of two different structural types can be fully developed by combining the single - layer spherical dome and the double - layer square pyramid space grids into a new structural type 在大跨度结构中,将单、双层网壳结合起来形成的一种结构形成?周边双层中部单层的球面网壳结构,可充分发挥两种结构形式的优点。