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通过理论分析与试验研究,依据混凝土结构试验方法标准中有关规定,对比了2种不同长度的附加钢筋在荷载作用下的受力特性,分别对应于附加钢筋有无伸出叠合板拼缝两侧的格构钢筋,观察叠合板试件从加载、出现裂缝到破坏的全过程,分析了试件在不同荷载作用下的受力状态。试验结果表明,附加钢筋较长的一组试验构造形式能够增加叠合板拼缝处的承载力,有利于阻止叠合板拼缝处裂缝的开展。最后分析了钢筋混凝土叠合板中附加钢筋对叠合板拼缝开裂弯矩的相关关系,为钢筋混凝土叠合板中附加钢筋的设计计算与结构性能检验提供了新的方法。
Through theoretical analysis and experimental research, according to the relevant provisions of the standard test method for concrete structures, the force characteristics of two additional reinforcing bars with different lengths under load are compared, respectively corresponding to the presence or absence of additional reinforcement plywood patchwork on both sides , The whole process of loading, cracking and failure was observed, and the stress state of the specimen under different loadings was analyzed. The experimental results show that the longer set of test structures with additional reinforcement can increase the bearing capacity of patchwork joints and prevent the crack initiation at the patchwork joints. Finally, the correlation between the additional rebar in the RC plywood and the cracking moment of the plywood is analyzed. The result provides a new method for the design calculation and structural performance inspection of the additional rebar in the RC plywood.