腐蚀后钢管混凝土力学性能研究进展

熊清清; 钱佳慧; 陈志华

doi:10.13206/j.gjgs22041501

腐蚀后钢管混凝土力学性能研究进展

doi: 10.13206/j.gjgs22041501

1. 天津大学建筑工程学院, 天津 300072;
2. 石家庄铁道大学土木工程学院, 石家庄 050043;
3. 道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学), 石家庄 050043

基金项目:

国家自然科学基金项目（52008270）；河北省自然科学基金项目（E2020210003）；河北省高等学校科学技术研究重点项目（ZD2022040）；河北省高等学校科学技术研究项目（QN2020409）。

详细信息

作者简介:
熊清清,女,1989年出生,博士,讲师。Email:xiongqingqing@stdu.edu.cn

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出版历程
- 收稿日期: 2022-04-15
- 网络出版日期: 2022-10-28

Research Progress on Mechanical Properties of Concrete-Filled Steel Tube Members Under Corrosive Environment

1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China;
2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
3. Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education (Shijiazhuang Tiedao University), Shijiazhuang 050043, China

摘要

摘要: 钢管混凝土在运输及施工过程中易出现防锈层脱落，在腐蚀性气体、液体和土壤等环境作用下服役，进一步加剧了钢管壁的腐蚀，引起截面损失和钢材本身性能的劣化。腐蚀后的钢管混凝土表现为整体承载力、塑性变形能力、组合弹性模量和对核心混凝土约束性能的降低，最终导致整体结构失效的风险增大。
通过对钢管混凝土腐蚀后性能研究现状的分析，从微观腐蚀形貌、宏观构件力学性能及相关理论计算方法三个方面对腐蚀后钢管混凝土的静力性能、抗震性能以及有限元分析方法进行了对比总结，并对腐蚀后钢管混凝土力学性能的研究进行了展望。
基于目前研究的分析表明：对于钢管混凝土腐蚀形貌，可以通过三维表面扫描仪来实现其高精度三维重构，通过腐蚀形貌的重构得到蚀坑尺寸、形状和深度等分布对其力学性能的影响；对于腐蚀后钢管混凝土静力性能，主要集中在均匀腐蚀后钢管混凝土的轴压、轴拉及偏压性能，且基于叠加理论计算腐蚀后钢管混凝土轴压承载力相较统一理论具有更高的精度。目前对于局部腐蚀后钢管混凝土的力学性能的研究较少，局部腐蚀虽然产生的失重率很小，但会引起构件应力集中、屈曲提前、承载力降低，严重威胁结构安全，因此有必要增加此方面的研究。对于腐蚀后的钢管混凝土柱的抗震性能研究发现，轴压比一定时，腐蚀率越高，承载力下降越大，屈服后腐蚀试件的耗能能力迅速降低；目前对钢管混凝土的腐蚀试验方面的研究主要通过通电加速腐蚀、盐雾腐蚀和机械开槽模拟等方法，采用盐雾腐蚀能更好地通过试验模拟实际的海水腐蚀，建立试验腐蚀与实际腐蚀环境的关联，可对今后的研究提供更有价值的参考；对腐蚀后钢管混凝土有限元模拟方法的研究中，钢管腐蚀常采用壁厚折减法、材性折减法、生死单元法、双层壳单元法及随机点蚀法等，研究表明蚀坑区产生应力集中，引起破坏模式的变化，强度显著降低。随机点蚀法实现了大量点蚀实例的快速几何建模，点蚀的形式和分布对构件疲劳损伤有显著影响，在研究裂纹扩展等疲劳问题时，不能忽视其随机性。随机腐蚀与实际腐蚀形貌存在一定差异，在后续的研究中考虑模拟随机点蚀法与工程实际的腐蚀形貌建立相关性是腐蚀模拟的关键，建议增加此方面研究，实现腐蚀后钢管混凝土力学性能的精细化有限元模拟。
通过介绍现有的研究现状，探讨并总结腐蚀后的钢管混凝土构件腐蚀形貌、力学性能和有限元模拟方法，为将来的进一步深入研究给出相关建议。
- 钢管混凝土 /
- 腐蚀形貌 /
- 静力性能 /
- 抗震性能 /
- 有限元模拟
Abstract: Concrete filled steel tubes(CFST) are easy to fall off the rust layer in the process of transportation and construction, and they are in service under the action of corrosive gas, liquid and soil, which further aggravates the corrosion of steel tube wall, causing section loss and deterioration of steel performance. After corrosion, the overall bearing capacity, plastic deformation capacity, combined elastic modulus and constraint performance of core concrete are reduced, and the risk of overall structure failure is increased.
To fully understand the development status of CFST after corrosion, the static performance, seismic performance and finite element analysis of corroded CFST were compared and summarized from three aspects:microscopic corrosion morphology, mechanical properties of macroscopic components and related theoretical calculation methods, and the research on the mechanical performance of corroded CFST was prospected.
Based on the analysis of the current research, the conclusions and prospects are as follows:the research on the corrosion morphology of CFST can realize the high-precision three-dimensional reconstruction of the corrosion morphology of concrete-filled steel tube through the three-dimensional surface scanner. The influence of the distribution law of corrosion pit size, shape and depth on its mechanical properties can be obtained through the reconstruction of corrosion morphology. The research on the static performance of CFST after corrosion mainly focuses on the axial compression, axial tension and eccentric compression performance of CFST after uniform corrosion. The study of axial compression bearing capacity of corroded CFST shows that the calculation of bearing capacity based on superposition theory is more accurate than that of unified theory. At present, there are few studies on the mechanical properties of c CFST after local corrosion. Although the weight loss rate caused by local corrosion is very small, it will cause stress concentration, buckling in advance and bearing capacity reduction of components, which seriously threatens the safety of structures. It is therefore necessary to increase research in this area. The study on the seismic performance of corroded CFST columns shows that when the axial compression ratio is constant, the higher the corrosion rate is, the greater the decrease in the bearing capacity is, and the energy dissipation capacity of the corroded specimens after yield decreases rapidly. The research on the corrosion test of CFST mainly adopts the methods of electric accelerated corrosion, salt spray corrosion and mechanical groove simulation. The salt spray corrosion can better simulate the actual seawater corrosion through the test, and establish the correlation between the test corrosion and the actual corrosion environment, which can provide more valuable reference for future research. In the study of the finite element simulation method of CFST after corrosion, the wall thickness reduction method, material reduction method, birth and death element method, double shell element method and random pitting method are often used in steel tube corrosion. The study shows that the stress concentration in the corrosion pit area causes the change of failure mode and the strength decreases significantly. The random pitting method realizes the rapid geometric modeling of a large number of pitting examples. The form and distribution of pitting have a significant influence on the fatigue damage of components, and its randomness cannot be ignored when studying fatigue problems such as crack propagation. There are some differences between the random corrosion and the actual corrosion morphology. In the follow-up study, it is the key to consider the correlation between the simulated random pitting method and the actual corrosion morphology of the project. It is suggested to increase this research to realize the refined finite element simulation of the mechanical properties of CFST after corrosion.
This article will introduce the current research situation, discuss and summarize the corrosion morphology, mechanical properties and finite element simulation methods of corroded CFST members, and give relevant suggestions for further research in the future.
- concrete filled steel tube /
- corrosion morphology /
- static performance /
- seismic performance /
- finite element simulation

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