斜拉桥锚拉板足尺模型疲劳试验

为研究斜拉桥钢主梁与锚拉板采用对接焊形成的“上”字形索梁锚固结构的疲劳性能，进行了锚拉板足尺模型疲劳试验。通过全桥有限元分析确定了疲劳试验的模型设计；综合对比多种疲劳荷载计算方法，确定了试验的疲劳荷载；考虑平均应力对疲劳荷载的影响，确定了疲劳荷载的最大、最小峰值。结果表明:足尺模型历经300万次疲劳加载后，各部位均未发现疲劳裂纹，应力测试结果与有限元分析值吻合良好；“上”字形索梁锚固结构的疲劳性能满足工程要求。

Fatigue Test of Full-scale Model of Tensile Anchor Plate in Cable-stayed Bridge

In order to study the fatigue property of special shaped anchorage structure of a cable beam which connects steel girder of cable-stayed bridge with tensile anchor plate using butt welding, the fatigue test of full-scale model of tensile anchor plate was carried out. Through the finite element analysis of whole bridge, the model design of the fatigue test was determined. Several fatigue load calculation methods were comprehensively compared, and the fatigue load was determined. At the same time, considering the influence of mean stress on fatigue load, the upper and lower peak value of fatigue load were determined. The results show that after 3 million times of loading cycles, there was no fatigue crack on the weld parts of the full-scale model, and the stress values of fatigue test and those of finite element analysis matches well. The fatigue property of the special-shaped structure meets the engineering requirements.