正交异性钢桥面横隔板切口弧形区域疲劳开裂及对策研究

发布时间：2018-07-10 14:59

本文选题：正交异性钢桥面板 + 钢箱梁　；参考：《长沙理工大学》2015年硕士论文

【摘要】：某大桥的管养单位在对大桥的一次日常巡检中发现该桥钢箱梁正交异性钢桥面板纵肋下横隔板切口弧形区域发生了开裂。通过进一步的观展发现,裂纹的发展速率较快且不断有新的裂纹出现。为避免裂纹持续的发展和增多对结构的安全性和适用性造成影响,需明确开裂位置的受力模式,了解结构开裂的原因,并据此提出适当的加固修复方法。本文主要做了以下工作:1.运用有限元软件ANSYS建立钢箱梁节段模型并确定合理的加载形式;通过试算得到使切口弧形区域受力最不利的面内面外加载位置;分析结构在最不利加载状况下的受力模式及变形特性;研究面外增大效应发生的原因。2.通过计算和对比获得适用于背景工程大桥钢箱梁的最优切口形状;通过对比归纳得出横隔板切口位置横隔板在荷载作用下的一般受力和变形规律;对得到的最优切口形状弧形区域圆弧的半径做了进一步优化。3.对不同加固修复方案的可行性进行了分析;明确止裂孔边沿的受力状况,对止裂孔的受力情况进行评估以确定是否需要采取进一步的加固措施;研究在止裂孔基础上进一步添加钢板进行补强的修复效果;研究添加内隔板后结构的受力模式;研究添加支撑板后结构的受力模式。
[Abstract]:In a daily inspection of the bridge, the pipe and maintenance unit of a certain bridge found that there was a crack in the arc-shaped area of the incision of the transverse partition under the longitudinal rib of the steel box girder of the orthotropic steel bridge of the bridge. Through further observation, it is found that the development rate of cracks is faster and new cracks appear continuously. In order to avoid the influence of the continuous development and increase of cracks on the safety and applicability of the structure, it is necessary to make clear the stress mode of the crack position, to understand the causes of the crack, and to put forward appropriate reinforcement and repair methods. This article mainly does the following work: 1. The finite element software ANSYS is used to establish the section model of steel box girder and the reasonable loading form is determined. The stress mode and deformation characteristics of the structure under the most unfavorable loading conditions are analyzed, and the causes of the out-of-plane enlargement effect are studied. Through calculation and comparison, the optimum notch shape of steel box girder suitable for background engineering bridge is obtained, and the general force and deformation law of transverse diaphragm under load are obtained by comparison and induction. The radius of the arc in the arc region of the optimal notch shape is further optimized. 3. The feasibility of different reinforcement and restoration schemes is analyzed, and the stress condition of the edge of the crack stop is clarified, and the stress situation of the stop hole is evaluated to determine whether further reinforcement measures are needed. This paper studies the reinforcement effect of steel plate on the basis of anti-crack hole, the stress mode of the structure after adding the inner partition plate, and the stress mode of the structure after adding the supporting plate.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.4;U443.31

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