焊接残余应力对带U形肋桥面板疲劳强度影响的研究
发布时间：2018-11-19 21:23
【摘要】：钢桥面板具有自重轻、承载极限大等优点，现已广泛应用于国内外桥梁中。在组成桥梁的桥面板间，一般都是通过焊缝进行连接的，由此产生的残余应力降低了结构的安全性能，同时，作为桥梁的重要组成部分，，桥面板还时刻承受着车辆的反复荷载作用。所以，准确的模拟钢桥面板间的残余应力，分析其对疲劳强度的影响，可以对延长桥梁的使用寿命，提高结构承载力和安全性提供参考。 本文通过ANSYS，对不同焊接条件下带U形肋的钢桥面板进行了残余应力以及疲劳强度分析。以实际工程为例建立了带U形肋的桥面板模型，通过编制APDL语言进行了不同焊接工艺条件下焊缝残余应力场模拟分析，对比分析各残余应力曲线的分布规律及大小变化，最终发现在其他焊接工艺条件不变的前提下：增大焊接速度，焊后产生的残余应力增大；减小焊接电流、电压或将埋弧自动焊改为二氧化碳气体保护焊，焊后产生的残余应力减小。改变焊接工艺条件，焊接残余应力的分布规律大体相近。通过参考大量的文献，对比分析了各种钢桥疲劳寿命的分析方法，系统评估了其中的疲劳荷载模拟加载、疲劳破坏点的确认、雨流计数法、S-N曲线等关键问题，并通过对模型的实际加载模拟，最终确认了带U肋的桥面板在有无残余应力条件下的疲劳破坏点及疲劳寿命。并通过最终的对比分析，确定了焊接残余应力对结构疲劳寿命的影响。 本论文的模拟可以为优化结构和改进焊接工艺提供参考，以提高钢桥的使用寿命。
[Abstract]:Steel bridge panel has been widely used in bridges at home and abroad for its advantages of light weight and high bearing limit. In general, the bridge deck is connected by welding seam, which reduces the safety performance of the bridge, and is an important part of the bridge, and the residual stress caused by the residual stress decreases the safety performance of the structure, at the same time, it is an important part of the bridge. The bridge deck still bears the repeated load of the vehicle at all times. Therefore, the accurate simulation of the residual stress between steel bridge panels and the analysis of its influence on fatigue strength can provide a reference for prolonging the service life of the bridge and improving the bearing capacity and safety of the structure. In this paper, the residual stress and fatigue strength of steel bridge face with U-shaped rib under different welding conditions are analyzed by ANSYS,. The model of bridge deck with U-shaped rib is established by taking the actual project as an example. The residual stress field of welding seam under different welding process conditions is simulated and analyzed by APDL language, and the distribution law and size change of each residual stress curve are compared and analyzed. Finally, it is found that the residual stress after welding increases with the increase of welding speed. Reducing welding current and voltage or changing automatic submerged arc welding to carbon dioxide gas shielded welding will reduce the residual stress after welding. The distribution of welding residual stress is similar to that of welding process condition. By referring to a large number of references, the fatigue life analysis methods of various steel bridges are compared and analyzed. The key problems of fatigue load simulation loading, fatigue failure point confirmation, rain flow counting method, S-N curve and so on are systematically evaluated. Finally, the fatigue failure point and fatigue life of the bridge slab with U-rib under the condition of residual stress or not are confirmed by the actual loading simulation of the model. The influence of welding residual stress on the fatigue life of the structure is determined by the final comparative analysis. The simulation of this paper can provide reference for optimizing structure and improving welding process to improve the service life of steel bridge.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
本文编号：2343460
[Abstract]:Steel bridge panel has been widely used in bridges at home and abroad for its advantages of light weight and high bearing limit. In general, the bridge deck is connected by welding seam, which reduces the safety performance of the bridge, and is an important part of the bridge, and the residual stress caused by the residual stress decreases the safety performance of the structure, at the same time, it is an important part of the bridge. The bridge deck still bears the repeated load of the vehicle at all times. Therefore, the accurate simulation of the residual stress between steel bridge panels and the analysis of its influence on fatigue strength can provide a reference for prolonging the service life of the bridge and improving the bearing capacity and safety of the structure. In this paper, the residual stress and fatigue strength of steel bridge face with U-shaped rib under different welding conditions are analyzed by ANSYS,. The model of bridge deck with U-shaped rib is established by taking the actual project as an example. The residual stress field of welding seam under different welding process conditions is simulated and analyzed by APDL language, and the distribution law and size change of each residual stress curve are compared and analyzed. Finally, it is found that the residual stress after welding increases with the increase of welding speed. Reducing welding current and voltage or changing automatic submerged arc welding to carbon dioxide gas shielded welding will reduce the residual stress after welding. The distribution of welding residual stress is similar to that of welding process condition. By referring to a large number of references, the fatigue life analysis methods of various steel bridges are compared and analyzed. The key problems of fatigue load simulation loading, fatigue failure point confirmation, rain flow counting method, S-N curve and so on are systematically evaluated. Finally, the fatigue failure point and fatigue life of the bridge slab with U-rib under the condition of residual stress or not are confirmed by the actual loading simulation of the model. The influence of welding residual stress on the fatigue life of the structure is determined by the final comparative analysis. The simulation of this paper can provide reference for optimizing structure and improving welding process to improve the service life of steel bridge.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4
【参考文献】
相关期刊论文 前10条
1 卞如冈;崔维成;万正权;李良碧;王铭伟;;焊接残余应力对疲劳寿命影响的定量研究[J];船舶力学;2011年07期
2 曹雷,严俊,宗培;船体焊接结构件残余应力消除的若干方法[J];船舶;2002年04期
3 田洋;李运生;张德莹;戴运良;;正交异性板U肋与桥面板焊缝连接的静力及疲劳试验研究[J];铁道科学与工程学报;2011年02期
4 陶晓燕;刘晓光;张玉玲;;正交异性钢桥面板受力特征研究[J];钢结构;2010年07期
5 余波;邱洪兴;王浩;郭彤;;正交异性钢桥面板构造细节疲劳性能及损伤演化研究[J];公路交通科技;2009年09期
6 姚熊亮;刘庆杰;孙谦;;球面艏端隔壁结构焊接变形研究[J];哈尔滨工程大学学报;2006年06期
7 莫春立,钱百年,国旭明,于少飞;焊接热源计算模式的研究进展[J];焊接学报;2001年03期
8 周张义;李芾;;焊接残余应力对钢结构疲劳性能影响研究[J];机车电传动;2009年02期
9 赵晓鹏;姜丁;张强;朱先民;;雨流计数法在整车载荷谱分析中的应用[J];科技导报;2009年03期
10 崔海军;;钢桥疲劳分析基本理论综述[J];科技经济市场;2010年01期
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