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为研究箱体形式对混凝土密肋空心楼盖受力性能的影响,设计制作了1块全现浇空心楼盖板带试件、1块明箱空心楼盖板带试件、1块暗箱空心楼盖板带试件,对3个试件进行静力试验,得到了各试件的破坏形态、荷载-钢筋应变曲线、荷载-混凝土应变曲线、荷载-跨中位移曲线,并对各试件开裂弯矩、极限弯矩进行对比分析。结果表明:预制混凝土箱体与现浇肋梁协同受力性能良好,全现浇板带试件与装配整体式板带试件刚度基本一致;由于现浇肋梁与预制混凝土箱体新旧混凝土结合面相对薄弱,以及板底钢筋不连续,明箱、暗箱空心楼盖板带的开裂弯矩和极限弯矩均低于全现浇空心楼盖板带;各试件开裂弯矩和极限弯矩的计算值与试验值吻合较好。
In order to study the influence of box form on the mechanical performance of concrete hollow ribbed hollow floor, a full cast-in-place hollow-core floor cover strip specimen was designed and manufactured, The test specimens of the floor slab and the three specimens were subjected to the static test. The failure morphology, load-strain curve, load-concrete strain curve and load-span displacement curve of each specimen were obtained. Cracking bending moment, the ultimate bending moment comparative analysis. The results show that the prestressed concrete box body and the cast-in-situ ribbed beam have good performance under the same load. The stiffness of the cast-in-place test strip and that of the monolithic strip are basically the same. The surface is relatively weak, and the rebar is not continuous at the bottom. The cracking moment and the ultimate bending moment of bright box and blind hollow slab are lower than those of fully cast-in-place hollow floor slab. The cracking moment and ultimate bending moment The calculated values agree well with the experimental values.