Study on Fretting Fatigue of Prestressing Cable at, Deviator

以下内容是本研究中发现的内容的摘要。疲劳强度的预压力强度和对频率的影响明显比正常的疲劳加载下的要小。Fretting Fatigue强度受压力范围、滑动范围和接触力影响。“更大的压力范围是，更大的接触力也是更小的力量。”The Experimental Fact Indicates that How slip range influences fretting fatigue strength may depend on magnitude of slip range。压力范围和滑动范围的影响远远大于接触力的程度。这是必要的，要考虑到在方向上滑动范围的影响，从直线轴的方向上到直线轴的影响。在同一条线上的电线之间发生摩擦，而不是在同一条线之间发生摩擦。这是一个事实，即它的滑动范围的影响。当然，接触力在内部接触点比在制造商外的一个点更有说服力，而且在几乎任何时候都找到了频率特征的位置。这一事实指标要么是以接触力的强度观察到的接触力强度的强度，由于接触力中的变化而受到影响，要么是由于实验中的实际接触力没有因位置而改变。在保护管上生长，用于电缆和树脂涂层的绳子可以增加冻结的脂肪强度， However，这是一个很难防止冻结的脂肪损伤，只能提供它们。对生长运动的限制是由Taper内部保护管或空间组成的，以减少接触可以防止摩擦力。

The followings are summary of what have been obtained in this research.・ Fatigue strength of prestressing strand under effect of fretting is apparently smaller than that under ordinary fatigue loading.・ Fretting fatigue strength is influenced by stress range, slip range and contacting force. The greater stress range is, and the greater contacting force is, the smaller becomes the fatigue strength. The experimental fact indicates that how slip range influences fretting fatigue strength may depend on magnitude of slip range. Extent of influence of stress range and slip range is greater than that of contacting force.・ It is necessary to consider effect of slip range in the direction normal to strand axis besides that in the direction of the strand axis.・ Fretting fatigue occurs at contacting point between strands rather than between wires in the same strand. This fact indicates that there is the effect of slip range.・ Although contacting force is considered greater at inner contacting points than at outer one at deviator, location of fretting fatigue fracture was found almost evenly. This fact indicates either that with magnitude of contacting force observed in the experiment fretting fatigue strength is hardly affected by change in contacting force, or that actual contacting force in the experiment did not change by the location.・ Grouting in protection tube for cable and resin coating of strand can increase fretting fatigue strength, However, it is difficult to prevent fretting fatigue fracture by providing them only.・ Restriction of grout movement by taper inside protection tube or spacer of strand for reduction of contacting can prevent fretting fatigue fracture.