【摘要】：用高強(qiáng)度鋼材做成的構(gòu)件長細(xì)比不宜太大，而板件寬厚比較大，因此，局部和整體相關(guān)屈曲很重要。對(duì)工字形截面構(gòu)件，腹板局部屈曲并不意味著承載能力的喪失，適當(dāng)放寬腹板高厚比，并利用腹板屈曲后強(qiáng)度，可以達(dá)到提高承載力、節(jié)約材料的目的。 本文采用有限元法分析了腹板高厚比超限的Q460鋼焊接工字形截面壓彎構(gòu)件的極限承載力；研究了腹板高厚比、翼緣寬厚比、構(gòu)件長細(xì)比和偏心率對(duì)其相關(guān)屈曲性能的影響；對(duì)部分構(gòu)件在不添加殘余應(yīng)力或初始幾何缺陷時(shí)進(jìn)行重新計(jì)算，分析了初始缺陷的影響；提出了計(jì)算Q460鋼壓彎構(gòu)件局部-整體相關(guān)屈曲極限承載力的修正公式。 研究表明，文中有限元模型能很好地模擬腹板高厚比超限的工字形截面壓彎構(gòu)件非線性屈曲性能。腹板高厚比增大，構(gòu)件極限承載力提高，腹板屈曲后強(qiáng)度保持能力增大，，構(gòu)件延性增大。相反，翼緣寬厚比增大，極限承載力減小，腹板屈曲后強(qiáng)度保持能力減弱，延性降低。長細(xì)比增加，剛度明顯減小，極限承載力降低，延性卻增大。偏心率增大，彎曲變形起主導(dǎo)作用，跨中撓度急劇增加，而軸力的變化相對(duì)變緩。初始缺陷的存在對(duì)極限承載力降低作用顯著。提出的修正公式計(jì)算結(jié)果與有限元結(jié)果吻合很好。
[Abstract]:The aspect ratio of the components made of high strength steel should not be too large, while the width and thickness of the plates should be large. Therefore, the local and global buckling is very important. For I-section members, the local buckling of web does not mean the loss of load-bearing capacity. By loosening the ratio of web height to thickness and utilizing the strength of web after buckling, the bearing capacity can be improved and the material can be saved. In this paper, the finite element method is used to analyze the ultimate bearing capacity of Q460 steel welded I-section compression and bending members whose web height / thickness ratio exceeds the limit, and the effects of web height to thickness ratio, flange width to thickness ratio, length to thickness ratio and eccentricity on the buckling performance of Q460 steel are studied. The effect of initial defects is analyzed by recalculating some members without adding residual stress or initial geometric defects, and a modified formula for calculating the ultimate load-bearing capacity of local and global buckling of Q460 steel compression and bending members is proposed. The results show that the finite element model in this paper can well simulate the nonlinear buckling behavior of I-shaped bending members with cross section. The ultimate bearing capacity of the members increases with the increase of the ratio of height to thickness of the web, the strength retention capacity of the web after buckling increases, and the ductility of the members increases. On the contrary, when the flange width to thickness ratio increases, the ultimate bearing capacity decreases, and the strength retention capacity and ductility decrease after buckling of the web. When the aspect ratio increases, the stiffness decreases, the ultimate bearing capacity decreases, but the ductility increases. With the increase of eccentricity, the bending deformation plays the leading role, the deflection in the span increases sharply, and the axial force changes relatively slowly. The existence of initial defects has a significant effect on the reduction of ultimate bearing capacity. The calculated results of the modified formula are in good agreement with the finite element results.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU392.1

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