带板大跨度预应力次梁楼盖边主梁协调扭转试验

为探讨带整浇板大跨度预应力次梁楼盖中边主梁与次梁之间弯扭分配的变化过程，进行了两个6m×8m带整浇板大跨度预应力次梁楼盖试件的边主梁协调扭转试验．通过对试验现象的观测和实测结果的分析，得出的主要结论为：大跨度预应力次梁楼盖的边主梁始终处于弯剪扭复合受力状态，其协调扭矩不可忽略，零刚度法不应采用；开裂以后，协调扭矩继续随荷载的增加而增长，这与ACI规范中的塑性设计法有显著区别．

Compatibility Torsion Test of Spandrel Beam with Cast-in-Place Slab in Long-Span PC Secondary Beam Floor System

The compatibility torsion tests of two 6 m ×8 m specimens of spandrel beam with cast-in-place slab in long-span PC secondary beam floor system were carried out to investigate the process of moment redistribution between spandrel beam and secondary floor beam in the floor system. Drawn from the analysis based on observations and measurements ,the main conclusions are as follows ：in long-span PC secondary beam floor system,the spandrel beam is always subjected to torsion-bending-shear,the compatibility torsional moment in the spandrel beam cannot be neglected, and the zero torsional moment design method should not be adopted;after cracking ,the compatibility torsional moment keeps growing with load, which is obviously different from the limit design method proposed by the American Concrete Institute （ACI） code.