腐蚀损伤Q690E钢板单调拉伸性能与滞回性能研究  

Monotonic tensile behavior and hysteretic behavior of Q690E steel plate with corrosion damage

作　　者：贾晨 邵永松[1,2] 郭兰慧[1,2] JIA Chen;SHAO Yongsong;GUO Lanhui(Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education,Harbin Institute of Technology,Harbin 150090,China;Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and InformationTechnology,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [2]哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2024年第4期177-188,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(52108127);先进焊接与连接国家重点实验室开放基金项目(AWJ-23R02);吉林省科技发展计划(20220203049SF)。

摘　　要：为了研究腐蚀损伤对国产Q690E高强钢板单调拉伸性能和滞回性能的影响,通过人工加速盐雾腐蚀试验得到腐蚀损伤试件,并对不同腐蚀损伤程度的试件进行了单调拉伸试验和单轴循环加载试验。基于单调拉伸试验结果,得到名义屈服强度、名义抗拉强度、屈强比及断后伸长率等基本拉伸性能指标与腐蚀损伤程度之间的回归关系。基于单轴循环试验结果,分析了腐蚀损伤对钢板应力-应变滞回曲线、低周疲劳寿命、循环软化性能以及耗能性能等的影响。结果表明:Q690E钢板的单调拉伸性能指标随腐蚀损伤程度增加而线性降低,在相同腐蚀程度下变形性能退化程度远远高于强度退化程度,高强钢板比低碳钢板对腐蚀损伤更敏感;恒幅循环加载下腐蚀损伤会降低钢板的低周疲劳寿命,造成滞回曲线的退化和捏缩,腐蚀损伤不影响钢板稳定软化阶段的循环软化程度但是影响循环软化速率;增幅循环加载下,随着腐蚀程度增加,钢板承载力不断退化,滞回耗能能力呈先增大后减小的趋势。To investigate the influences of the corrosion damage on the monotonic tensile and hysteretic behavior of Q690E steel plate,artificially accelerated corrosion test was conducted to obtain the corroded specimens.Then coupon test and the uniaxially cyclic loading test were performed on the specimens with different corrosion degrees.Based on the tensile tests,the nominal yield stress,nominal tensile strength,yield-to-strength ratio and the final elongation of each specimen were captured and the regression relationships between these parameters and corrosion degree were determined.According to the cyclic tests,the effects of the corrosion damage on the stress-strain hysteretic curves,low cycle fatigue life,cyclic softening and energy dissipation were analyzed.The experimental results reveal that the tensile properties of Q690E steel plate decrease linearly with the increase of corrosion damage degree,and the degradation of the deformability is higher than that of strength.Besides,the deterioration of high strength steel induced by corrosion damage is severer than that of the low carbon steel.In terms of the hysteretic performance,corrosion damage would cause reduction of the fatigue life and the degradation and pinching of the hysteretic curves under constant-amplitude loading.Furthermore,corrosion damage would not affect the stable cyclic softening degree in steady softening stage but would influence the softening rate.Under increasing-amplitude loading,as the corrosion degree increases,the ultimate strength decreases and the energy dissipation capacity first increases then decreases.

关 键 词：高强钢板 腐蚀损伤 强度 变形性能 滞回性能 循环软化 

分 类 号：TU391[建筑科学—结构工程] TU317.1