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Low cycle fatigue behavior of constraint connections Part Ⅰ: influence of constraint severity

机译：约束连接件的低周疲劳行为第一部分：约束严重性的影响

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The general influence of constraint effects on reversed low-cycle fatigue performance was investigated. Constraint effects are being considered to have contributed to the failure of welded Steel Moment Resisting Frames (SMRFs), were cracks initiated in constraint regions during recent earthquakes. However, this study revealed that high constraint enhanced the resistance to crack initiation during cyclic loading by reducing the local strains at the notch tip. Furthermore, changes in toughness due to various constraint severities had almost no influence on the low cyclic performance of steel under constraint. This applies to low and high stress levels as well as low and high constraint, covering the whole range of possible scenarios of low-cycle and even towards high-cycle fatigue. While high toughness is still important for enhancing the fracture strength to accommodate the maximum imposed stresses/strains in earthquake loading, it most likely does not play a key role in cyclic performance.
机译：研究了约束效应对反向低周疲劳性能的一般影响。约束效应被认为是导致钢制抗弯框架（SMRF）失效的原因，这是最近地震在约束区域引发的裂缝。但是，这项研究表明，高约束条件可以通过减少缺口尖端的局部应变来增强抗周期性裂纹加载的能力。此外，由于各种约束强度导致的韧性变化几乎对约束条件下钢的低循环性能没有影响。这适用于低和高应力水平以及低和高约束条件，涵盖了低循环乃至高循环疲劳的所有可能情况。尽管高韧性对于增强断裂强度以适应地震载荷中的最大施加应力/应变仍然很重要，但它很可能在循环性能中不发挥关键作用。

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