桥塔钢-混凝土结合段剪力键破坏机理及极限承载力

Fracture Mechanism and Ultimate Carrying Capacity of Shear Connectors Applied for Steel-concrete Joint Segment of Bridge Pylon

为了研究和开发可用于桥塔钢-混凝土结合段的新型剪力键,针对传统的推出试验无法得出剪力键真实承载力的问题,采用新的试验方法对包括栓钉和两种新型剪力键在内的3大类7个子类共31个试件进行了破坏试验研究。根据试验结果,对各类剪力键的破坏机理进行了研究,并对其极限承载力进行了定量分析,建立了各类剪力键极限承载力的统一计算公式。通过与试验值的对比可知:该公式计算结果与试验值吻合良好,可为新型剪力键的设计和应用提供依据。

In order to do research and develop on new type shear connectors applied for concrete joint segment of bridge pylon, aimed at the problem that the conventional push-out test is unable to ascertain the real carrying capacity of shear connectors, a new test method was developed in the fracture test for 31 specimens of seven sub-types in three big types for the investigation and development of new-type shear connectors that can be utilized in steel-concrete joint segment of bridge pylon. The fracture mechanism of each type was studied and the quantitative analysis of ultimate carrying capacity was also carried out according to the experiment results. Then, the uniform calculation formula of established which can provide ultimate carrying capacity for each new type shear connector was instruction in future design and application. Compared with test values, calculated results of the formula agree well with test values.