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。
Abstract
In order to study the residual mechanical performance of the staggered-hole plates with Q460 high strength steel (HSS) after fatigue damage, the high cycle fatigue tests and static tensile tests after fatigue damage including 9 groups of 36 specimens with Q460 HSS were conducted. The tests considered the influences of loading coefficient (K), damage parameter (D) and number of staggered holes, i.e., and the influence of these factors on the failure mode, load-displacement curve, bearing capacity and strain distribution mode of the staggered hole plates using Q460 HSS were studied. The results showed that when the parameter D was increased to 0.45, the fracture path of the 3-staggered-hole plates was obviously different from the theoretical yield path, and the fracture surface was irregular; with the increase of the D in a certain range, the deformation capacity of the multi-staggered-hole plate tended to increase, but the bearing capacity of the specimens decreased suddenly earlier. The influence of the K on the bearing capacity of multi-staggered-hole plates was closely related to the parameter D; With the increase of the number of holes, the fatigue damage had a greater impact on the bearing capacity of the specimens. Based on AISC/ANSI 360-16 and EN 1993-1-8 codes, a prediction model for the residual bearing capacity of the multi-staggered-hole plates with Q460 HSS considering fatigue damage was established. The model was in good agreement with the test results, and can better reflect the influence of fatigue damage on the bearing capacity of the multi-staggered-hole plates using Q460 HSS. The research results can provide experimental and theoretical basis for the performance reliability evaluation of high strength steel structures.
关键词
高强钢 /
交错孔板 /
疲劳损伤 /
破坏模式 /
承载力
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Key words
high strength steel /
staggered-hole plate /
fatigue damage /
failure mode /
bearing capacity
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