Based on the orthogonal test design, this paper studied the effect of low cycle stress, high-low cycle stress ratio , high cycle number and high cycle frequency on complex fatigue life.
在高低周复合疲劳研究中采用了正交试验设计的方法，并以此为基础综合研究了低周应力、高低周应力比、高周循环次数和高周循环频率对复合疲劳寿命的影响及其机理。
The cycle stress ratio is the ratio of dynamic strength and soil static strength, as it passes the critical cycle stress ratio, accumulated deformation takes on and soil strength declines.
土体在动力荷载作用下，当动荷载与土体静强度的比值即循环应力比超过某一临界循环应力比时，土体才会发生累积变形和强度弱化。
Then, transient response of vertical displacement, vertical stress and pile-soil stress ratio of some nodes in the elastic subgrade are computed in one single load cycle.
采用桩土分析法，计算分析在一个荷载周期内，弹性路基内各研究节点的位移、竖向应力、桩土应力比的瞬态响应。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
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