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现有叠合楼板设计时垂直拼缝方向不考虑承受外荷载作用,导致成本增加和不符合实际的受力情况。通过不同构造形式的叠合楼板试验,研究不同构造处理形式的拼缝叠合楼板在竖向单调荷载作用下的受力特性,观察叠合楼板试件从裂缝开始出现到破坏状态的全过程,分析试件在各级荷载下挠度、抗弯承载力变化及拼缝处钢筋应力传递变化情况。结果表明:拼缝处未设附加约束的叠合楼板具有一定的承载能力,但搭接纵筋超过屈服荷载后,会产生脆性断裂破坏;当设置格构钢筋约束时,能够保证拼缝处钢筋的有效传力,且具有较高的延性,叠合楼板承载力即为拼缝处截面承载力。
The vertical splitting direction in the design of the existing laminated floor does not consider the effect of bearing the external load, resulting in the increase of the cost and the non-conformity with the actual stress situation. Through the test of different types of laminated floor, the mechanical properties of the piled composite floor with different structures in the form of vertical monotonic load are studied. The whole process of the specimen from the crack initiation to the failure state is observed, The deflection, the flexural capacity and the stress transfer of the reinforcement at the patchwork are analyzed. The results show that the composite slab without any additional restraint at the patchwork joints has some bearing capacity, but the brittle failure happens when the overlapped longitudinal reinforcement exceeds the yield load. When the restraint of the lattice reinforcement is set, the reinforcement at the patchwork can be guaranteed Of the effective transfer of force, and has high ductility, composite floor bearing capacity is the section bearing capacity of the patchwork.