桥式起重机箱型梁疲劳与安全性研究

发布时间：2018-01-15 20:27

本文关键词：桥式起重机箱型梁疲劳与安全性研究　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：桥式起重机作为最常用的起重机械之一,已经广泛应用各个生产单位。本文以辽宁恒泰重机有限公司生产的50/5t×33.5m桥式起重机为研究对象,以有限单元法、结构力学、断裂力学等为理论基础,对其进行建模仿真。首先对桥式起重机的静态特性进行分析；其次对桥式起重机的疲劳分析；最后对该桥式起重机安全性进行评估。主要内容如下：1)桥机的刚度、强度和稳定性校核。讨论了桥式起重机的基本参数、计算载荷和工作特点；按照《起重机设计规范》,对箱型梁的刚度、强度、稳定性进行了计算与校核。2)桥机箱型梁结构的有限元分析。利用Autodesk Inventor软件对桥式起重机箱型梁进行建模；对该桥式起重机的四种典型工况进行载荷计算；运用Autodesk Inventor的分析模块对该桥机箱型梁进行静力学分析。3)桥机的疲劳分析。概括和分析了桥式起重机箱型梁疲劳裂纹产生机理、主要产生位置以及扩展机理；进一步研究推导出桥式起重机箱型梁剩余寿命的估算方法并进行了实例分析；基于箱型梁的应力集中问题,提出一种结构改进方法,并加以验证；根据裂纹止裂修复理论,制定箱型梁疲劳裂纹的止裂修复方案,并验证修复方案的可行性。4)基于模糊理论对桥机进行安全性评价及结构剩余安全使用期限的预测。对桥机的结构技术性能状态的主要指标进行归纳；对桥机的剩余安全使用期限预测方法：对研究机型进行实例计算与分析。
[Abstract]:Bridge crane as one of the most commonly used lifting machinery has been widely used in various production units. This paper takes the 50 / 5t 脳 33.5m bridge crane produced by Liaoning Hengtai heavy Machinery Co. Ltd as the research object. Based on the theory of finite element method, structural mechanics and fracture mechanics, the paper models and simulates it. Firstly, the static characteristics of bridge crane are analyzed. Secondly, the fatigue analysis of bridge crane; Finally, the safety of the bridge crane is evaluated. The main contents are as follows: 1) checking the stiffness, strength and stability of the bridge crane. The basic parameters, calculation load and working characteristics of the bridge crane are discussed. According to the "Crane Design Code", the box girder stiffness, strength. The finite element analysis of the box girder structure of the bridge is carried out. The box girder of the bridge crane is modeled by Autodesk Inventor software. The load of the bridge crane is calculated under four typical working conditions. The statics analysis of the box girder of the bridge is carried out by using the analysis module of Autodesk Inventor. 3). Fatigue analysis of bridge crane. The mechanism of fatigue crack in box girder of bridge crane is summarized and analyzed. The main generation position and expansion mechanism; The method of estimating the residual life of box girder of bridge crane is further studied and analyzed. Based on the stress concentration of box girder, a structural improvement method is proposed and verified. According to the theory of crack arrest and repair, the crack arrest and repair scheme of box girder fatigue crack is established. The feasibility of the repair scheme is verified. 4) based on the fuzzy theory, the safety evaluation of the bridge machine and the prediction of the remaining safety life of the structure are carried out, and the main indexes of the structural technical performance state of the bridge machine are summarized. The method of predicting the remaining safety life of the bridge machine: the example calculation and analysis are carried out.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH215

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