RESEARCH ON CONNECTION TECHNIQUE FOR BIDIRECTIONAL COMPOSITE FLOOR SLABS WITHOUT GAP
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摘要: 提出一种双向受力叠合楼板新型密拼连接技术,并对相关节点构造进行足尺试验,与现浇楼板进行对比,研究新型连接构造的受力性能,包括破坏模式、承载力、刚度以及楼板的裂缝分布等。在此基础上,利用有限元计算的精细化分析,深入研究连接部位处钢筋与混凝土之间的传力机理。研究结果表明:新型密拼构造的受力性能基本等同现浇结构,数值计算与试验结果吻合较好,拼缝位置的封闭环形钢筋能有效传递结构内力。Abstract: A new type of connection technique for bidirectional composite floor slabs without gap was proposed. Full-scale tests on the construction of slabs' joints were carried out, and compared with cast-in-place slab. The mechanical properties of the new type of joint structure were studied, including the failure mode, bearing capacity, stiffness and crack distribution of floor slab. On the basis of the tests, a refined finite element analysis was performed, then the mechanism of force transfer between steel bar and concrete at the joint was deeply studied. The results showed that the mechanical properties of the new joint connected without gap was basically the same as that of the cast-in-place structure. The numerical calculation agreed well with the experimental results. The reinforcement at joint could effectively transfer structural internal force.
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