The cable-pylon anchorage zones of Changtai Changjiang River Bridge are steel box-core concrete composite structures.This paper presents the findings of the full-scale model tests on the mechanical properties of the steel-concrete shear transfer details of the composite cable-pylon anchorage structure.Two full-scale sectional models were prepared to investigate the load-slip curves as well as stress and strain distribution in the anchorage structure via compressive shear tests.The load transfer mechanism of the anchorage structure and the internal force sharing proportion of the anchorage constituents were numerically analyzed,and the method to calculate the shear forces of shear studs was derived.It is shown that under the 2.14 times maximum tension of individual stay cables,the anchorage structure remains in elastic condition,no obvious slip of steel walls is observed,the maximum slip of steel-concrete interface is less than 0.25 mm,and the safety factor of steel-concrete shear transfer details is at least 2.14 times of the required level.Under the action of loads,the shear forces in the shear studs show sign of a top-down increase,with three rows of shear studs near the base of the anchorage webs bearing bigger shear forces.Shear studs and interface friction are the two types of shear transfer mechanisms of the steel-concrete shear transfer details,as a result,the load bearing capacity of the steel-concrete shear transfer details is significantly improved.The steel-concrete shear transfer details undergo a bonding force transfer stage and a local slip stage.The shear distribution in shear studs is not only associated with its length along the shear direction,but also linearly related to load actions.
关键词
斜拉桥/组合索塔锚固结构/钢-混传剪构造/荷载～滑移曲线/足尺模型试验/有限元法
Key words
cable-stayed bridge/composite cable-pylon anchorage structure/steel-concrete shear transfer details/load-slip curve/full-scale model test/finite element method
维普
万方数据