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首页> 外文期刊>Journal of Constructional Steel Research >Mechanism study on the low cycle fatigue behavior of group studs shear connectors in steel-concrete composite bridges
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Mechanism study on the low cycle fatigue behavior of group studs shear connectors in steel-concrete composite bridges

机译：钢-混凝土组合桥中群钉剪力连接器低周疲劳行为的机理研究

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Clustering the stud shear connectors with a narrow spacing to form group studs is useful for the concrete slab prefabrication in steel-concrete composite bridges. But the existing test and analysis results have shown that arranging studs in group tends to be unfavorable to the stud static and fatigue performance. The current fatigue design of the group studs may still experience an overestimation or an underestimation problem since the fatigue mechanism study on group studs is rare. Therefore, a parametric push-out analysis was carried out for explaining the fatigue behavior of group studs, particularly the low cycle fatigue aspect with the fatigue life lower than 2 million cycles. There were 12 static and cyclic push-out models in the analysis. Meanwhile, a series of static push-out tests were also introduced to verify the analysis works. According to the static analysis results, the unequal stud shear forces in the group studs, which were indicated by the analyzed static failure mode, resulted in the reductions of stud shear stiffness and strength. According to the low cycle cyclic analysis results, the fatigue damage initiated at the bottom point of the stud root section in the push load direction, which can be called the fatigue critical point. The low cycle fatigue life reduction of group studs, which was evaluated by the analysis results and the introduced multi-axial fatigue damage criterion, can be explained by the uneven cyclic tensile strain and stress distributions on every individual fatigue critical point in the group studs. (C) 2017 Elsevier Ltd. All rights reserved.
机译：将钢绞线剪力连接器以狭窄的间距成簇以形成组螺栓，这对于在钢混凝土组合桥中预制混凝土板非常有用。但是现有的测试和分析结果表明，将螺栓成组布置会不利于螺栓的静态和疲劳性能。由于对群钉的疲劳机理研究很少，因此目前的群钉疲劳设计可能仍会出现高估或低估的问题。因此，进行了参数推出分析，以解释组螺栓的疲劳行为，特别是疲劳寿命低于200万次循环的低周疲劳方面。分析中有12个静态和循环推出模型。同时，还引入了一系列静态推出测试来验证分析工作。根据静力分析结果，通过分析静力破坏模式表明，群钉中的不均匀螺柱剪切力会导致螺柱剪切刚度和强度降低。根据低周期循环分析结果，疲劳破坏是在推力载荷方向上在螺柱根部截面的底部开始的，该疲劳点可以称为疲劳临界点。通过分析结果和引入的多轴疲劳损伤准则来评估组螺栓的低周疲劳寿命降低，可以用组螺栓每个疲劳临界点上的不均匀循环拉伸应变和应力分布来解释。 （C）2017 Elsevier Ltd.保留所有权利。

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