國產Q460高強度鋼材焊接工字形截面殘余應力試驗及分布模型研究
發(fā)布時間：2019-02-19 11:54
【摘要】：焊接殘余應力是影響鋼結構受壓構件整體穩(wěn)定性能的一種重要初始缺陷。為研究國產Q460高強度鋼材焊接工字形截面的殘余應力分布,該文采用分割法對8個不同截面尺寸和焊縫類型的截面試件進行了測量。基于近2000組測量數(shù)據(jù),得到了不同試件全截面的殘余應力分布和拉、壓應力大小,并研究了腹板和翼緣的板件寬厚比、板件厚度、焊縫類型以及腹板和翼緣的相關性等因素對殘余應力的影響。試驗結果表明,殘余壓應力的數(shù)值大小與截面尺寸直接相關而基本不受焊縫類型的影響,殘余拉應力的大小則與截面尺寸沒有相關性;由于翼緣和腹板內的殘余應力能夠分別滿足自平衡條件,二者沒有相互間的影響作用。最后,該文提出了能夠準確描述試驗結果和截面尺寸影響的國產Q460高強鋼焊接工字形截面的殘余應力分布模型和計算公式。
[Abstract]:Welding residual stress is an important initial defect which affects the overall stability of steel structure subjected to compression. In order to study the residual stress distribution of welded I-shaped section of Q460 high strength steel made in China, eight cross-section specimens with different cross section sizes and weld types were measured by split method. Based on the data of nearly 2000 groups of measurements, the residual stress distribution and tensile and compressive stress of the total sections of different specimens are obtained. The width to thickness ratio and thickness ratio of the plates to the flange are studied. The influence of weld type and the correlation between web and flange on residual stress. The experimental results show that the numerical value of residual compressive stress is directly related to the size of the section and is not affected by the type of weld, but the magnitude of the residual tensile stress is not related to the size of the section. Because the residual stresses in the flange and web can satisfy the self-equilibrium condition respectively, there is no interaction between them. Finally, a model and calculation formula of residual stress distribution of welded I-shaped section of domestic Q460 high strength steel are presented, which can accurately describe the test results and the effect of section size.
【作者單位】： 土木工程安全與耐久教育部重點實驗室清華大學土木工程系;School
【基金】：國家自然科學基金項目(51078205)
【分類號】：TU391
本文編號：2426477
[Abstract]:Welding residual stress is an important initial defect which affects the overall stability of steel structure subjected to compression. In order to study the residual stress distribution of welded I-shaped section of Q460 high strength steel made in China, eight cross-section specimens with different cross section sizes and weld types were measured by split method. Based on the data of nearly 2000 groups of measurements, the residual stress distribution and tensile and compressive stress of the total sections of different specimens are obtained. The width to thickness ratio and thickness ratio of the plates to the flange are studied. The influence of weld type and the correlation between web and flange on residual stress. The experimental results show that the numerical value of residual compressive stress is directly related to the size of the section and is not affected by the type of weld, but the magnitude of the residual tensile stress is not related to the size of the section. Because the residual stresses in the flange and web can satisfy the self-equilibrium condition respectively, there is no interaction between them. Finally, a model and calculation formula of residual stress distribution of welded I-shaped section of domestic Q460 high strength steel are presented, which can accurately describe the test results and the effect of section size.
【作者單位】： 土木工程安全與耐久教育部重點實驗室清華大學土木工程系;School
【基金】：國家自然科學基金項目(51078205)
【分類號】：TU391
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