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影剧院观众厅跨度一般约在20～30米之间,其楼层承重结构布置基本上有两种: 一是在悬臂梁上布置楼层梁板系统。悬臂梁的根部延伸到影剧院前厅以平衡观众厅楼层的重量。此方案要求影剧院必须要有相当进深的前厅。因此受到建筑面积和造价的制约。另一种是在交叉梁上布置楼层梁板系统的方案。它采用如图1所示的交叉梁系作为楼层承重结构。此方案的优点是与影剧院有无前厅,以及与前厅进深尺寸大小无关。其次,交叉梁的变位比悬臂梁要小很多,因而楼层刚度较好。不论上述那种方案,在条件许可时均应做成预应力构件。以后张自锚的预应力方法
The auditorium auditorium spans approximately 20 to 30 meters, and there are basically two types of floor bearing structure: First, the floor beam system is arranged on the cantilever beam. The root of the cantilever beam extends into the theater auditorium to balance the weight of the auditorium floor. This program requires the theater to have a fairly advanced lobby. Therefore, it is restricted by the construction area and cost. The other option is to arrange floor slab systems on cross beams. It uses the cross-beam system shown in Figure 1 as the floor bearing structure. The advantage of this solution is that it has no vestibule with the theater, and it has nothing to do with the depth of the lobby. Secondly, the crossbeams are much smaller than the cantilever beam, so the floor stiffness is better. Regardless of the above-mentioned scheme, prestressed members should be made when conditions permit. Later Zhang Zhang’s prestress method