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由于钢管与混凝土之间的黏结力非常有限,极易在节点处产生钢管与混凝土界面滑移即脱黏,严重降低拱肋的承载能力。在钢管混凝土拱肋内置PBL加劲肋可提高节点处钢管与混凝土界面黏结力,增强钢管混凝土协同工作能力。该文以某钢管混凝土拱桥为例,对拱肋节点进行了非线性分析,探讨了PBL加劲肋对节点破坏形式、极限承载力、钢管的应力分布等力学性能的影响。结果表明:内置PBL加劲肋可增强钢管与混凝土界面黏结力,便于使拱上立柱产生的水平力由钢管和混凝土共同承担,有效提高了节点承载力。内置PBL加劲肋是对钢管混凝土拱肋节点的一种有效改进形式。
Due to the very limited cohesion between the steel pipe and the concrete, it is easy to produce the slippage between the steel pipe and the concrete interface at the node, that is, to debond, which seriously reduces the bearing capacity of the arch rib. The built-in PBL stiffener in CFST arch rib can increase the bond strength between the steel pipe and the concrete interface at the node and enhance the ability of the CFST to work together. Taking a CFST arch bridge as an example, the nonlinear analysis of arch rib joints is carried out, and the influence of PBL stiffeners on mechanical properties such as node failure mode, ultimate bearing capacity and steel pipe stress distribution is discussed. The results show that the built-in PBL stiffener can enhance the cohesion between the steel pipe and the concrete, so that the horizontal force generated by the upright column can be shared by the steel pipe and the concrete, effectively increasing the bearing capacity of the node. Built-in PBL stiffeners are an effective and improved form of CFST arch joints.