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为分析海洋混凝土结构在波浪及海流等荷载作用下的疲劳特性,基于试验结果分析,我们建议了一个用弹塑性增量变刚度法分段跟踪疲劳应力-应变关系曲线及应力循环次数与疲劳应变关系曲线相结合的非线性有限元分析法。混凝土的本构模型采用内时损伤模型。该分析方法的特点是利用较少的机时,就可分析得出结构经过任一疲劳次数(包括上百万次)高周疲劳全过程后的应力、应变状态。这在国内外尚属少见,从而为海洋混凝土结构疲劳特性的有限元分析及用分析法部分代替冗长、昂贵的疲劳试验提供了条件。为验证分析方法的可靠性,我们对海洋平台中经常遇到的钢筋混凝土板的疲劳特性进行了分析,所得计算结果与试验结果符合较好,证明了本文所建议方法的可行性。
In order to analyze the fatigue behavior of marine concrete structures under wave and ocean current loads, based on the analysis of test results, we propose a method to segment the fatigue stress-strain curve and the number of stress cycles and fatigue strain Nonlinear Finite Element Analysis Method Based on the Relationship Curve. The constitutive model of concrete uses the internal damage model. The analysis method is characterized by the use of less machine time, you can analyze the structure after any fatigue (including millions of times) the whole process of high-cycle fatigue stress and strain state. This is rare at home and abroad, which provides the conditions for finite element analysis of the fatigue characteristics of marine concrete structures and the replacement of lengthy and expensive fatigue tests with analytical methods. In order to verify the reliability of the analytical method, we analyze the fatigue characteristics of reinforced concrete slabs often encountered in offshore platforms. The calculated results are in good agreement with the experimental results, which proves the feasibility of the proposed method.