【作者】 高勇；

【导师】 雷斌隆；

【作者基本信息】 西南交通大学 ， 材料加工工程， 2004， 硕士

【摘要】 公路是我国国民经济的大动脉。而桥梁是公路的重要组成部分。广泛使用成品梁已成为当今我国公路桥梁建设中一项行之有效的重要技术措施。随之桥梁安装架设工艺也相应得到发展。公路架桥机就是在这一历程中产生和发展的。目前，我国公路架桥设备的生产和配套已初具规模，形成了装配式和专用型竟相发展的格局。在这种情况下，从安全及经济效益角度出发，为避免施工过程中出现架桥机倾覆和人员伤亡等重大事故，对架桥机进行力学行为分析和缺陷安全评估是很有益处的。 本文采用当今世界最为流行的大型有限元软件——ANSYS软件对JQJ-100／40专用型架桥机导梁进行应力有限元分析。根据架桥机实际运行情况，建立了悬臂、跨中、架边梁三种工况下的力学模型，得出了导梁上应力分布情况；运用我国压力容器缺陷评定标准CVDA-84对JQJ-100／40专用型架桥机导梁角焊缝缺陷进行安全评定。同时对该架桥机在实际生产中可能存在的各种缺陷，求出了最大裂纹尺寸，对设计及生产施工均具有一定的指导意义。更多还原

【Abstract】 The highway is the aorta of the national economy in our country. And the bridge is an important constitute of highway. Nowadays the extensive usage of the finished product beam have become an important technique measure in our country. The situation of the development of assembly type along with the appropriation type of bridge-erecting equipment has been formed . In this case, it is meaningful to study the mechanics behavior of bridge-erecting machine. It can bring us safety and economy benefit.The most fashionable and general engineering software -ANSYS will be applied in this paple. The stress distribution of the beam of bridge-erecting machine will be analyzed with FEM (finite element method) program. According to the practical situation, mechanics models of the beam have been established on three loading conditions. The computation results indicated that the place where the maximum equivalent stress occurred. Based on fracture mechanics and the standard of pressure vessel (CVDA-84), the tolerable defect size is determined. The conclusion of this paper could be used as guidelines to design the welded structure. The results are also very useful for safety assessment of defect.更多还原