| 摘要 |
<p>The girder has lattice bars (20, 30, 40, 50) connected with each other in an articulated manner. Repeating successive structures are spreaded into a pyramid-like or pyramid-frustum-like structure (10), where a point of the repeating successive structure stays in connection with a base area (11) of the adjacent structure or forms a part of the base area of the adjacent structure. The lattice bars are arranged at vertices of the base area of the spreaded structure, where the lattice bars interconnect the structures with each other.</p> |
