循环加载和高温冷却对 Q450 耐候钢机械性能的影响

IF 4 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Constructional Steel Research Pub Date : 2024-10-25 DOI:10.1016/j.jcsr.2024.109084
Chuntao Zhang , Linwei Cui , Zhisong Wang
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引用次数: 0

摘要

对钢结构在地震、风振和高温冷却等循环加载后的机械特性进行研究,有助于研究钢结构在极其复杂的环境中的稳定性。因此,本研究调查了高温冷却后循环加载 Q450 耐候钢的机械特性。在进行拉伸试验之前,先对 Q450 耐候钢进行循环加载破坏,然后对不同循环加载破坏的 Q450 耐候钢试样进行加热和冷却。根据试验结果,还讨论了循环加载和高温冷却的顺序对钢材力学特性的影响。观察了高温冷却后循环加载 Q450 风化钢的失效模型。通过比较未损坏钢试样的机械特性,讨论了 Q450 耐候钢在极端环境下的残余机械特性。试验结果表明,损伤前的循环加载、加热温度和冷却方法对 Q450 耐候钢的强度、弹性模量和延展性等重要参数有很大影响。比较循环加载、加热和冷却的顺序,循环加载预破坏为 95% 的 Q450 耐候钢受极端环境顺序的影响很大。相比之下,当预损伤为 50% 和 75% 时,极端环境序列的影响并不显著。此外,弹性模量与极端环境序列无关,而伸长率则在不同程度的预破坏下显示出复杂的变化规律。最后,利用多组分数值模型提出了考虑到循环加载损伤、温度和冷却方法交互影响的应力-应变关系。
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Effects of cyclic loading and high-temperature cooling on mechanical properties of Q450 weathering steel
The investigation of the mechanical properties of steel structures after cyclic loadings such as earthquakes, wind vibrations, and high-temperature cooling helps to study the stability of steel structures in extremely complex environments. Hence, this study investigates the mechanical characteristics of cyclically loaded Q450 weathering steel after high-temperature cooling. Before the tensile test, Q450 weathering steel was previously damaged by cyclic loading, and then the Q450 weathering steel specimens with different cyclic loading damages were heated and cooled. Based on the test results, the effect of the sequence of cyclic loading and high-temperature cooling on the mechanical characteristics of steel was also discussed. The failure model of cyclically loaded Q450 weathering steel after high-temperature cooling was observed. The residual mechanical characteristics of Q450 weathering steel after being subjected to extreme environments were discussed by comparing the mechanical characteristics of undamaged steel specimens. The test findings reveal that the cyclic loading pre-damage, heating temperature, and cooling method greatly impact the important parameters of Q450 weathering steel, such as strength, elastic modulus, and ductility. Comparing the sequence of cyclic loading, heating and cooling, Q450 weathering steel with cyclic loading pre-damage of 95 % was considerably influenced by the sequence of extreme environments. In contrast, the influence of the extreme environmental sequence was not significant when the pre-damage was 50 % and 75 %. In addition, the modulus of elasticity is indifferent to the extreme environmental sequences, whereas the elongation displays complicated change patterns under varied degrees of pre-damage. Finally, the stress-strain relationship considering the interactive effects of cyclic loading damage, temperature, and cooling method was proposed using a multi-component numerical model.
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来源期刊
Journal of Constructional Steel Research
Journal of Constructional Steel Research 工程技术-工程:土木
CiteScore
7.90
自引率
19.50%
发文量
550
审稿时长
46 days
期刊介绍: The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.
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