Cyclic Cumulative Damaging of Reinforced Concrete in Post-Peak Regions
Cyclic Cumulative Damaging of Reinforced Concrete in Post-Peak Regions
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DOI：
10.3151/jact.2.257
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发表时间：
2004
影响因子：
2
通讯作者：
K. Maekawa;K. El-kashif
中科院分区：
文献类型：
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作者：
K. Maekawa;K. El-kashif
重复较高的应力显然会导致渐进损伤，这也是应变/应力率相关的。本文旨在分离随时间变化的累积非线性和应变路径重复对混凝土受压损伤演化的影响。进行了混凝土的循环单轴压缩试验，从总应力应变关系中减去时变塑性和刚度退化，以纯提取重复应力循环的影响。通过材料和结构试验，特别是在峰后区域，验证了损伤的时间依赖性和真实的循环累积的耦合，并主要在低周(N100)疲劳试验中验证了该本构关系的适用性，并根据S-N曲线验证了所提出的本构关系所预测的疲劳寿命。
Repetition of higher stresses apparently causes progressive damage, which is also strain/stress rate-dependent. This paper aims to separate time-dependent cumulative nolinearity and the effect of repetition of strain path on the overall damage evolution of concrete in compression. Cyclic uniaxial compression tests of concrete were conducted and time-dependent plasticity and stiffness degradation were subtracted from total stress-strain relations to purely extract the effect of repeated stress cycle. Coupling of time dependency and authentic cyclic accumulation of damage was examined by both material and structural experiments especially in post-peak regions, and its applicability was experimentally verified mainly under low cyclic (N 100) fatigue life predicted by the proposed constitutive law was also verified in terms of the S-N curve.