波形腹板H形钢梁的焊接残余应力对性能的影响
发布时间：2018-11-17 21:37
【摘要】：焊接是钢结构工程中连接的主要方式。随着钢结构的发展,20世纪末以来在建筑行业中地应用日益广泛。然而在钢材的焊接阶段中,受到了材料相变、位移约束和温度场的不均匀分布等各方面因素,导致在焊接结束后的焊件中出现了残余应力与变形,是影响焊接结构裂纹萌生和扩展、降低钢材的各方面功能的关键因素。另外,虽然许多相关专业人员针对此问题进行了焊接工艺的改良、设置加劲肋等有效措施,但是焊缝密集以及焊缝形状复杂等所导致的焊接残余应力更需要受到研究人员的重视,同时应该对这种安全隐患所造成的危害进行更深入的认识。所以把焊接残余应力作为影响波形腹板H形钢的受力性能的不利因素融入到其受力分析与设计中是有非常重要的意义的。本文对相关文献与研究成果进行归纳总结,将波形钢腹板设计理论与焊接热学理论相结合,使用大型通用有限元软件ANSYS热-结构耦合分析功能对波形腹板H形钢梁的焊接残余应力进行有限元模拟计算。得出波形钢腹板梁的焊接残余应力以及变形的分布情况。并对其进行了深入的分析。通过分析波形腹板H形钢梁的焊接残余应力分布情况,发现焊接过程的复杂性会干扰其残余应力的分布。这要比单一焊缝焊接时的应力分布复杂很多。同时还分析了焊接过程中金相组织转换对残余应力的影响。然后将波形腹板H形钢梁焊接残余应力的分布情况与其抗弯性能、抗剪性能等力学性能进行结合分析,得出下翼缘板残余应力对其抗弯性能有着不小的降低,腹板的焊接残余应力对其抗剪性能的影响并不显著。通过将波形腹板H形钢的焊接变形与结构受力性能总和研究,指出其焊接变形将会永久地改变波形腹板H形钢梁的板件尺寸以及结构的扭曲性能。在分析了焊接残余应力以及焊接变形对波形腹板H形钢梁有可能造成不利因素之后,通过结构设计以及焊接工艺改善这两方面对波形腹板H形钢的设计制造提出建议,达到降低或是消除焊接残余应力以及焊接变形对结构造成的危害。分别说明了焊接时焊缝的尺寸和形式、焊接坡口、焊接热源的输入以及焊接方法的选择对焊接残余应力和焊接变形的影响。最后提出使用新型焊接工艺,这样能够提高焊接效率,有效地降低焊接过程中产生的残余应力。
[Abstract]:Welding is the main way of connection in steel structure engineering. With the development of steel structure, it has been widely used in the construction industry since the end of the 20th century. However, in the welding stage of steel, the residual stress and deformation appear in the welded parts after welding due to the material phase transition, displacement constraints and uneven distribution of temperature field, etc. It is the key factor that affects the crack initiation and propagation of welded structure and reduces the function of steel in all aspects. In addition, although many relevant professionals have improved the welding process and set up stiffening ribs to solve this problem, But the welding residual stress caused by the dense weld seam and the complicated weld shape should be paid more attention by researchers and the harm caused by this kind of safety hidden danger should be deeply understood at the same time. Therefore, it is of great significance to take welding residual stress as an unfavorable factor to affect the mechanical properties of H-shaped steel with wave webs into its mechanical analysis and design. In this paper, the relevant literature and research results are summarized, and the design theory of corrugated steel web is combined with the theory of welding heat. The finite element simulation of welding residual stress of H-shaped steel beam with corrugated webs is carried out by using the thermal-structural coupling analysis function of ANSYS, a general finite element software. The distribution of welding residual stress and deformation of corrugated steel web beam is obtained. And it is deeply analyzed. By analyzing the distribution of welding residual stress of H-shaped steel beam with corrugated web, it is found that the complexity of welding process will interfere with the distribution of residual stress. This is much more complicated than the stress distribution in single weld welding. At the same time, the influence of microstructure transformation on residual stress during welding process is analyzed. Then, the distribution of welding residual stress of H-shaped steel beam with wave webs is combined with its bending and shear properties, and it is concluded that the residual stress of the lower flange plate has no small reduction to its bending performance. The effect of welding residual stress on shear resistance of web is not significant. By studying the summation of welding deformation and structural mechanical properties of the H-shaped steel with corrugated webs, it is pointed out that the welding deformation will permanently change the plate size of H-shaped steel beams with corrugated webs and the distortion properties of the structures. After analyzing the possible disadvantageous factors of welding residual stress and welding deformation to the H-shaped steel beam with corrugated webs, some suggestions are put forward for the design and manufacture of the H-shaped steel with wave webs through structural design and improvement of welding process. To reduce or eliminate welding residual stress and welding deformation damage to the structure. The effects of weld size and form, welding groove, input of welding heat source and welding method on welding residual stress and welding deformation were explained respectively. Finally, a new welding process is proposed, which can improve the welding efficiency and effectively reduce the residual stress in the welding process.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG404
本文编号：2339109
[Abstract]:Welding is the main way of connection in steel structure engineering. With the development of steel structure, it has been widely used in the construction industry since the end of the 20th century. However, in the welding stage of steel, the residual stress and deformation appear in the welded parts after welding due to the material phase transition, displacement constraints and uneven distribution of temperature field, etc. It is the key factor that affects the crack initiation and propagation of welded structure and reduces the function of steel in all aspects. In addition, although many relevant professionals have improved the welding process and set up stiffening ribs to solve this problem, But the welding residual stress caused by the dense weld seam and the complicated weld shape should be paid more attention by researchers and the harm caused by this kind of safety hidden danger should be deeply understood at the same time. Therefore, it is of great significance to take welding residual stress as an unfavorable factor to affect the mechanical properties of H-shaped steel with wave webs into its mechanical analysis and design. In this paper, the relevant literature and research results are summarized, and the design theory of corrugated steel web is combined with the theory of welding heat. The finite element simulation of welding residual stress of H-shaped steel beam with corrugated webs is carried out by using the thermal-structural coupling analysis function of ANSYS, a general finite element software. The distribution of welding residual stress and deformation of corrugated steel web beam is obtained. And it is deeply analyzed. By analyzing the distribution of welding residual stress of H-shaped steel beam with corrugated web, it is found that the complexity of welding process will interfere with the distribution of residual stress. This is much more complicated than the stress distribution in single weld welding. At the same time, the influence of microstructure transformation on residual stress during welding process is analyzed. Then, the distribution of welding residual stress of H-shaped steel beam with wave webs is combined with its bending and shear properties, and it is concluded that the residual stress of the lower flange plate has no small reduction to its bending performance. The effect of welding residual stress on shear resistance of web is not significant. By studying the summation of welding deformation and structural mechanical properties of the H-shaped steel with corrugated webs, it is pointed out that the welding deformation will permanently change the plate size of H-shaped steel beams with corrugated webs and the distortion properties of the structures. After analyzing the possible disadvantageous factors of welding residual stress and welding deformation to the H-shaped steel beam with corrugated webs, some suggestions are put forward for the design and manufacture of the H-shaped steel with wave webs through structural design and improvement of welding process. To reduce or eliminate welding residual stress and welding deformation damage to the structure. The effects of weld size and form, welding groove, input of welding heat source and welding method on welding residual stress and welding deformation were explained respectively. Finally, a new welding process is proposed, which can improve the welding efficiency and effectively reduce the residual stress in the welding process.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG404
【参考文献】
相关期刊论文 前10条
1 陈勇;;波纹腹板H型钢梁的整体稳定性[J];黑龙江科技学院学报;2013年04期
2 张哲;李国强;孙飞飞;;波纹腹板H型钢梁受弯承载力性能研究[J];建筑结构学报;2011年10期
3 杨延功;平学成;;焊接残余应力的测试方法[J];化工设备与管道;2009年05期
4 李国强;张哲;孙飞飞;;波纹腹板H型钢梁抗剪承载力[J];同济大学学报(自然科学版);2009年06期
5 张哲;李国强;孙飞飞;;波纹腹板H型钢研究综述[J];建筑钢结构进展;2008年06期
6 杨文;石永久;王元清;施刚;;结构钢焊接残余应力三维有限元分析[J];吉林大学学报(工学版);2007年02期
7 倪红芳,凌祥,涂善东;多道焊三维残余应力场有限元模拟[J];机械强度;2004年02期
8 李冬青 ,孟庆国 ,陶军 ,王立华;焊接动态位移场的建模与数值模拟[J];焊接;2002年02期
9 鹿安理,史清宇,赵海燕,吴爱萍;厚板焊接过程温度场、应力场的三维有限元数值模拟[J];中国机械工程;2001年02期
10 王伟,朱六妹,尚小刚;焊接温度场测试技术的探讨[J];物理测试;1998年06期
相关硕士学位论文 前1条
1 贺冉;考虑焊接残余应力的门式刚架节点域设计研究[D];重庆交通大学;2015年
，本文编号：2339109
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2339109.html
