摘要
为研究Q460高强钢交错孔板疲劳损伤后的残余力学性能,进行了9组共36个Q460高强钢试件的高周疲劳试验与疲劳损伤后静力拉伸试验,探讨了加载系数、损伤因子和交错孔数量等因素,对交错孔板破坏模式、荷载-位移曲线、承载力和应变分布模式等的影响规律。研究表明:当损伤因子增加到0.45时,三交错孔板试件的断裂路径与理论屈服线路径存在明显差异,且断裂面不规则;一定范围内增大损伤因子,多交错孔板的变形能力呈增加趋势,但试件较早出现承载能力突降等劣化现象;加载系数对多交错孔板极限承载力的影响程度与损伤因子密切相关,随着开孔数量增多,疲劳损伤对试件的承载力影响越大。基于AISC/ANSI 360-16和EN 1993-1-8规范,建立了考虑疲劳损伤的Q460高强钢多交错孔板残余承载力预测模型,该模型与试验结果吻合较好,可较好地反映疲劳损伤对多交错孔板试件承载力的影响规律,研究成果可为高强钢结构性能可靠性评估提供试验和理论依据。
Here,to study residual mechanical performance of Q460 high-strength steel(HSS)staggered-hole plate after fatigue damage,high-cycle fatigue tests and static tensile tests after fatigue damage were conducted for 9 groups of 36 Q460 HSS specimens to explore effects of loading coefficient(K),damage factor(D)and number of staggered holes on failure mode,load-displacement curve,load-bearing capacity and strain distribution mode of Q460 HSS staggered-hole plate.The results showed that when damage factor D increases up to 0.45,the fracture path of 3-staggered-hole plate is obviously different from the theoretical yield line path,and fracture surface is irregular;with increase in D within a certain range,deformation capacity of multi-staggered-hole plate tends to increase,but specimens earlier have degradation of a sudden decrease in load-bearing capacity;effects of loading coefficient K on the ultimate load-bearing capacity of multi-staggered-hole plate is closely related to damage factor D;with increase in number of holes,fatigue damage has an increasingly impact on load-bearing capacity of specimens.Based on AISC/ANSI 360-16 and EN 1993-1-8 codes,a prediction model for residual load-bearing capacity of Q460 HSS multi-staggered-hole plate considering fatigue damage was established.It was shown that the model agrees better with test results,it can better reflect effects of fatigue damage on load-bearing capacity of Q460 HSS multi-staggered-hole plate;the study results can provide test and theoretical bases for performance reliability evaluation of high-strength steel structures.
作者
梁刚
杨佳男
李淑敏
刘云贺
LIANG Gang;YANG Jianan;LI Shumin;LIU Yunhe(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;State Key Lab of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2023年第23期307-315,共9页
Journal of Vibration and Shock
基金
国家自然科学基金项目(51978571)
中国博士后科学基金(2022M712562)
陕西省自然科学基金项目(2020JQ-628.2023-JC-YB-309)
陕西省教育厅项目(21JK0795)。
关键词
高强钢(HSS)
交错孔板
疲劳损伤
破坏模式
承载力
high strength steel(HSS)
staggered-hole plate
fatigue damage
failure mode
load-bearing capacity
