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锈蚀、磨损和微动疲劳是导致后张法预应力缆索结构或其拉索的性能退化及最终破坏的原因。在目前的研究中,从理论和数值分析的角度讨论了断裂时间在结构响应中所起的作用。另外,基于先前理论研究的试验,分析了7股钢绞线中已破坏钢线和未破坏钢线的破裂期间的荷载时程曲线和断裂所需的时间。在3种应变速率的受拉状态下进行的试验,用于判断这些参数对构件断裂时间和荷载时程曲线的影响。破坏的构件同样可以用于分析截面局部损害对构件刚度和极限强度的影响。
Corrosion, wear and fretting fatigue are responsible for the degradation and eventual destruction of the post-tensioning prestressed cable structure or its cable. In the current study, the role of fracture time in structural response was discussed from both theoretical and numerical perspectives. In addition, based on the previous theoretical studies, the loading time history and the time required for rupture during the rupture of damaged and unbroken steel wires out of 7 strands were analyzed. Tests performed under tension at three strain rates were used to determine the effect of these parameters on the component break time and load time history. Damaged components can also be used to analyze the effect of local damage to the member stiffness and ultimate strength.