腐蚀和长期荷载共同作用下钢管混凝土K形节点力学性能研究

钢管混凝土桁式组合结构凭借其卓越的结构性能与经济优势，在跨海大桥、沿海塔架、海洋平台等大型基础设施中得到广泛的应用。此类结构在海洋腐蚀环境中服役时，主要承重构件与关键连接节点往往受到荷载与腐蚀长期共同作用的影响。以往，对腐蚀作用下的钢管混凝土关键节点力学性能研究尚少见报道。本文对腐蚀与长期荷载共同作用下钢管混凝土K形节点这一典型桁式组合节点的全过程力学性能进行了研究。主要研究内容及成果如下：

1. 基于实际工程中钢结构腐蚀分布规律，通过Python数值编程与ABAQUS建模，建立了可以考虑钢管外壁腐蚀（均匀腐蚀、随机局部腐蚀）、材料长期性能变化规律及钢-混凝土非线性约束作用时变的钢管混凝土K形节点精细化有限元分析模型。结合相关试验数据对模型准确性进行验证，模拟结果与试验结果吻合良好。

2. 基于获得验证的有限元模型，深入分析了钢管混凝土K形节点在腐蚀和长期荷载共同作用下的破坏模态、全过程荷载-变形关系以及剩余承载力。明晰了腐蚀类型（均匀腐蚀、随机局部腐蚀）、体积腐蚀率对节点力学性能的影响规律。

3. 对影响腐蚀和长期荷载共同作用下钢管混凝土K形节点力学性能的关键参数进行系统分析，所分析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。基于参数分析结果，给出了该工况下节点剩余承载力的简化计算方法。

4. 对腐蚀和长期荷载共同作用下钢管混凝土K形节点的疲劳性能开展研究。基于节点疲劳试验数据调研，建立了钢管混凝土节点S-N曲线；建立了节点热点应力有限元模型，模型准确性得到相关试验数据的验证。分析了体积腐蚀率、蚀坑深度、直径、蚀坑的空间分布位置等对应力集中系数的影响，研究了该工况下钢管混凝土K形节点的剩余疲劳寿命。

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