國產(chǎn)Q460高強(qiáng)度鋼材焊接工字形截面殘余應(yīng)力試驗及分布模型研究
[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(xué)土木工程系;School
【基金】:國家自然科學(xué)基金項目(51078205)
【分類號】:TU391
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