This paper presents a study on the histories of ultrasonic velocity variations of concrete specimen during biaxial cyclic compressive loading tests.
对混凝土在双轴压疲劳荷载作用下超声波波速的变化规律进行了试验研究。
The result shows: the local residual tensile stress and cyclic compressive loading thrust fatigue crack initiation and propagation in the size of compressive plastic zone.
结果表明，疲劳裂纹是在残余拉应力和循环压应力作用下萌生和扩展的，压塑性变形是裂纹萌生和扩展的必要条件。
The piezoresistivities of SCFC under monotonic compressive loading, cyclic loading with increasing amplitudes, cyclic loading with constant amplitude and the dead loading are investigated.
研究了SCFC的压敏特性，得到了SCFC在单调受压荷载、等幅循环荷载、不等幅循环荷载以及持续荷载等过程中的电阻变化规律。
For concrete in compression zone a stress-strain relation for repeated axial compressive cyclic loading, is adopted instead of that for reversed loading.
对混凝土受压区采用轴向重复加载的应力-应变关系而不是反复加载的。
For concrete in compression zone a stress-strain relation for repeated axial compressive cyclic loading, is adopted instead of that for reversed loading.
对混凝土受压区采用轴向重复加载的应力-应变关系而不是反复加载的。
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