把薄钢板弯成向上开口的单波形截面,依次并排放置组成屋盖。采用预应力技术,可使这种钢薄膜梁跨度达到20米;若采用自应力技术,则跨度可达40米。预应力梁的预拉力在单波板两边施加。张拉时依靠于边缘构件,使边缘构件受压而板两边受拉,从而避免在梁弯曲过程中出现板边压屈,降低梁的承载能力。预拉力还使 The thin steel plate is bent into a single waved section with an upward opening, which in turn is placed side by side to form a roof. The use of prestressed technology allows the steel film beam to reach a span of 20 meters; if the self-stress technique is used, the span can reach 40 meters. The pretension of the prestressed beam is applied on both sides of the single wave plate. When tensioning, it depends on the edge member, so that the edge member is stressed and the two sides of the plate are tensioned, thereby avoiding the occurrence of plate edge buckling during beam bending and reducing the bearing capacity of the beam. Pretension also makes