服役10年Q355耐候钢高温下力学性能试验研究  

Experimental study on mechanical properties of corroded Q355 weathering steel at high temperature

作　　者：张宗星 田宸睿 姜健 叶继红 肖璐萍 徐宇轩 ZHANG Zongxing;TIAN Chenrui;JIANG Jian;YE Jihong;XIAO Luping;XU Yuxuan(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《建筑结构学报》2024年第12期170-180,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(52108292,52078478)。

摘　　要：为研究锈蚀钢材高温下力学性能演变规律,对服役10年的厚12 mm的Q355耐候钢进行单调拉伸高温试验,研究不同温度下锈蚀钢材破坏形态、应力-应变曲线及力学性能退化规律,并通过三维逆向重建技术,建立考虑锈蚀表面形貌的数值分析模型,研究不同温度下锈蚀钢材表面应力发展规律,对比不同温度下锈蚀钢材表面应力集中系数及损伤规律。结果表明:锈蚀钢材表面凹凸不平,分布着大小不同的蚀坑;随着锈蚀程度增加,常温下钢材强度和延性逐渐降低,抗拉强度和伸长率最大下降了20%和39%;高温加剧了锈蚀对钢材弹性模量的影响,试件表面应力集中程度均逐渐减弱;当温度达到900℃时,不同锈蚀程度下钢材力学性能基本一致,高温显著削弱了锈蚀损伤的影响,但锈蚀对钢材延性的影响仍存在。In order to study the evolution of mechanical properties of corroded steel at high temperature,high temperature tensile tests were conducted on 12 mm thick Q355 weathering steel that had been in service for 10 years.The damage morphology,stress-strain curve and mechanical property degradation law of corroded steel at different temperatures were discussed.A numerical analysis model considering the surface morphology of corroded steel was established using three-dimensional reverse reconstruction technology.The development law of surface stress of corroded steel at different temperatures was studied,and the surface stress concentration coefficient and damage law of corroded steel at different temperatures were compared.The results show that the surface of the corroded steel is uneven and features pits of different sizes.With the increase in the degree of rust,the strength and ductility of steel at room temperature gradually decrease,with ultimate strength and elongation decreasing by 20%and 39%,respectively.As temperature increases,the influence of corrosion on the elastic modulus of steel is intensified,and the surface stress concentration of the specimens gradually decreases.When the temperature reaches 900℃,the mechanical properties of steel with different degrees of corrosion are found to be basically the same.High temperature significantly reduces the influence of corrosion damage,but the influence of rust on the ductility of steel still exists.

关 键 词：耐候钢 锈蚀 高温试验 受力性能 退化规律 

分 类 号：TU511[建筑科学—建筑技术科学]