摘要
钢结构桥梁在低温环境下的疲劳性能是钢桥梁研究领域的热点和难点问题。本文通过实验和数值模拟相结合的方法，研究了在不同温度下钢结构桥梁的疲劳性能变化规律和机理。实验结果表明，在-20℃环境下，钢结构桥梁的疲劳寿命降低约50%，且当温度继续降低时，疲劳寿命也会进一步下降。数值模拟结果与实验结果基本一致，验证了实验结果的可靠性。通过分析实验和数值模拟结果，发现在低温环境下，钢结构桥梁的疲劳性能受到温度的影响，主要表现为材料塑性性能的下降和裂纹扩展速率的加快。同时，低温环境下的冷却效应使得钢结构桥梁的温度分布不均匀，进一步加速了桥梁的疲劳破坏。本文对于了解低温环境下的钢结构桥梁疲劳性能有重要的参考价值，为设计和维护低温环境下的钢结构桥梁提供了科学依据和技术支持。
关键词：低温环境，钢结构桥梁，疲劳性能
Abstract
With the wide application of steel structures in construction, industry, transportation and other fields, corrosion protection technology has become an important means to ensure the extended service life of steel structures. This paper aims to summarize the current research status and application of steel structure corrosion protection technology, explore the new progress of steel structure corrosion protection technology, as well as the advantages, disadvantages and applicable scope of different technologies. The importance of steel structure corrosion protection is first introduced, followed by a comparative analysis of common steel structure corrosion protection technologies, including anti-corrosion coatings, hot-dip galvanizing, anodic protection, nanomaterials and other technologies. Various new types of corrosion protection technologies, such as rust-proof coatings, nano-composite coatings, and high-pressure spraying of tin, are also introduced. Detailed analysis is conducted on the characteristics and applicable scenarios of each technology, providing references for construction companies and owners. Furthermore, this paper analyzes some representative application cases of the petroleum and chemical industry, construction industry, and transportation industry, to illustrate the current application status and effects of steel structure corrosion protection technology in different industries. Economic and social benefits are analyzed to demonstrate the importance of steel structure corrosion protection technology. Finally, this paper summarizes the advantages and disadvantages of current steel structure corrosion protection technologies, and prospects the future development direction, proposing recommendations for enhancing green environmental awareness and promoting new corrosion protection technologies, providing references for the innovation and application of steel structure corrosion protection technology. This research has important reference value and guiding significance for promoting the further development of steel structure corrosion protection technology.
Key words: low temperature environment, steel bridge, fatigue performance.
目录
摘要 1
Abstract 2
1.1 钢结构桥梁疲劳问题的概述 4
1.2 低温环境对钢结构桥梁疲劳性能的影响 5
第2章 低温环境下钢结构桥梁的现状及影响 7
2.1 钢结构桥梁的疲劳研究现状 7
2.2 低温环境对钢结构材料力学性能的影响 7
2.3 低温环境下的钢结构桥梁疲劳评估方法 8
第3章 实验与方法 10
3.1 材料试验 10
3.2 低温环境下的疲劳试验 10
3.3 实验数据处理方法 10
第4章 结果与分析 12
4.1 材料试验结果分析 12
4.2 低温环境下的疲劳试验结果分析 12
4.3 不同温度下的疲劳寿命及强度分析 13
4.4 针对低温环境下钢结构桥梁的疲劳问题提出的建议和措施 14
第5章 结 论 15
参 考 文 献 16
致 谢 17
