The presentation and application of prestressed steel structure has come through about half a century, but the application of prestressed double layer space grids is merely twenty years.
预应力钢结构的提出和应用已经历了将近半个世纪，而预应力钢网架的应用，还只是近二十年的事。
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———周边双层中部单层球面网壳结构，可充分发挥两种结构形式的优点。
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———周边双层中部单层球面网壳结构，可充分发挥两种结构形式的优点。
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