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为了研究锚拉板式索梁锚固结构在疲劳荷载下的应力分布,以某斜拉桥为例,利用ABAQUS建立三维实体模型,对其应力分布进行了分析,在此基础上对索梁锚固模型进行了优化设计,最后通过足尺模型常幅疲劳加载试验,得到了构件随加载循环次数增加的应力变化情况,并与数值分析的结果进行了对比分析。试验结果表明,锚拉板的应力集中区域,特别是高峰应力区,其在循环荷载作用下的应力幅值较高,内部可能产生一定缺陷,并且造成应力分布不均匀。设计时尽可能通过合理的参数优化及构造措施降低区域的应力集中程度,慎重选择钢材及焊接工艺,以满足索梁锚固结构的抗疲劳能力。
In order to study the stress distribution of anchor-cable girder anchorage structure under fatigue load, taking a cable-stayed bridge as an example, the three-dimensional solid model was established by ABAQUS and the stress distribution was analyzed. Based on this, Finally, the stress changes of the component with the increase of the number of loading cycles are obtained through the fatigue test of the full-scale model. The results are compared with the numerical results. The experimental results show that the stress concentration area of anchor plate, especially the peak stress zone, has a higher stress amplitude under cyclic loading, which may cause some defects in the interior and cause uneven stress distribution. When designing, the stress concentration in the area should be reduced through rational parameter optimization and structural measures as much as possible. The steel and welding process should be carefully selected so as to meet the fatigue resistance of cable-anchorage structure.