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随机局部腐蚀作用下钢管混凝土K形节点的力学性能分析

赵文杰 张静怡 侯超

赵文杰, 张静怡, 侯超. 随机局部腐蚀作用下钢管混凝土K形节点的力学性能分析[J]. 钢结构(中英文), 2022, 37(3): 10-19. doi: 10.13206/j.gjgS21100801
引用本文: 赵文杰, 张静怡, 侯超. 随机局部腐蚀作用下钢管混凝土K形节点的力学性能分析[J]. 钢结构(中英文), 2022, 37(3): 10-19. doi: 10.13206/j.gjgS21100801
Wenjie Zhao, Jingyi Zhang, Chao Hou. Mechanical Performance Analysis of Concrete Filled Steel Tubular K-joints Subjected to Random Local Corrosion[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(3): 10-19. doi: 10.13206/j.gjgS21100801
Citation: Wenjie Zhao, Jingyi Zhang, Chao Hou. Mechanical Performance Analysis of Concrete Filled Steel Tubular K-joints Subjected to Random Local Corrosion[J]. STEEL CONSTRUCTION(Chinese & English), 2022, 37(3): 10-19. doi: 10.13206/j.gjgS21100801

随机局部腐蚀作用下钢管混凝土K形节点的力学性能分析

doi: 10.13206/j.gjgS21100801
基金项目: 

深圳市科技计划资助项目(RCYX20210706092)。

详细信息
    作者简介:

    赵文杰,男,1997年出生,硕士研究生。

    通讯作者:

    侯超,男,1988年出生,博士,副教授,houc@sustech.edu.cn。

Mechanical Performance Analysis of Concrete Filled Steel Tubular K-joints Subjected to Random Local Corrosion

  • 摘要: 桁式钢管混凝土组合结构由于传力明确、整体性能好,具备优越的结构性能与经济优势,在腐蚀环境下服役的跨海特大桥梁、沿海塔架、海洋平台等大型基础设施中得到广泛的应用。在此类结构中,主要承重构件与关键连接节点受到荷载与腐蚀长期耦合作用的影响,对结构的安全性与可靠性提出了严峻的挑战。在实际工程中,钢材表面的腐蚀作用通常以随机分布的局部腐蚀为主;以往,受试验条件与数值模拟技术的限制,对随机局部腐蚀作用下的钢管混凝土关键节点力学性能研究尚不多见,在一定程度上制约了对此类主体结构全寿命服役性能的认识及其科学设计方法的制定。基于此,对随机局部腐蚀与长期荷载耦合作用下钢管混凝土K形节点这一典型桁式组合节点的全过程力学性能展开深入研究。
    建立了可以考虑钢管外壁随机局部腐蚀及其对材料非线性约束作用的复杂时变影响的钢管混凝土K形节点精细化有限元分析模型。基于实际环境中海工钢结构随机局部腐蚀的分布规律,通过Python与ABAQUS的模型搭建,进行随机蚀坑分布生成、腐蚀单元识别与蚀坑区域自动化网格划分,实现了对弦、腹杆钢管外壁的随机局部腐蚀的模拟。此外,模型中考虑了腐蚀过程中材料间非线性约束作用的时变劣化以及核心混凝土的长期变形特性,且模型的准确性得到系列试验结果的验证。利用有限元模型,深入分析了节点在局部腐蚀作用下的破坏模态、全过程荷载-变形关系与剩余极限承载力;明晰了腐蚀类型(均匀分布或随机局部分布)、体积腐蚀率等重要参数对节点力学行为的影响规律。考察了随机局部腐蚀作用下影响钢管混凝土K形节点力学性能的重要参数,包括体积腐蚀率、材料强度、弦杆径厚比、腹弦杆管径比等。在参数分析结果的基础上,提出了钢管混凝土K形节点腐蚀后剩余强度的简化计算方法,结合有限元结果验证了公式的有效性。
    分析结果表明:随机局部腐蚀作用下的钢管混凝土K形节点的破坏模态主要为受压腹杆的局部屈曲,在受压腹杆的蚀坑集中区域往往会出现应力集中而发生局部屈曲失效;由于弦杆内填充混凝土,节点区域力学性能得以改善;与均匀腐蚀相比,局部腐蚀对钢管混凝土K形节点力学性能的影响更为显著,且局部腐蚀的随机分布会进一步降低节点的承载力,即当体积腐蚀率一定时,随机局部腐蚀节点承载力比非随机局部腐蚀情况多降低2%~5%;腹杆体积腐蚀率对节点承载力起控制作用。
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出版历程
  • 收稿日期:  2021-10-08
  • 网络出版日期:  2022-05-27

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