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由于矮塔斜拉桥斜拉索承担荷载的比例较小,设计时其容许应力值比常规斜拉桥的取值要大。随着设计容许应力值的增大,其抗疲劳性能成为设计人员关心的问题。因此,从疲劳可靠度理论出发,运用基于拉索疲劳寿命服从Weibull分布的疲劳可靠度公式,对江肇高速公路西江特大桥拉索在活载作用下的疲劳可靠度进行了评估,分析得到了单索面矮塔斜拉桥拉索设计容许应力值的合理取值。分析结果对同类型矮塔斜拉桥的设计有一定的参考意义。
Due to the small load on the cable stayed bridge, the allowable stress is larger than that of conventional cable-stayed bridges. As the design allows the increase of stress, its fatigue resistance has become a designer’s concern. Therefore, starting from the theory of fatigue reliability, the fatigue reliability of the cable of Xijiang Special Bridge on Jiangzhao Expressway under live load was evaluated by using the fatigue reliability formula based on Weibull distribution of fatigue life of cable, and the fatigue reliability of the cable was evaluated. The Design of Cable Design for Cable Stayed Cable Stayed Cables to Allow Reasonable Stress Values. The results of the analysis have certain reference meaning for the design of the same type of low-rise cable-stayed bridge.