摘要：随着社会的不断发展，我国的钢桁梁桥设计、制造、所用钢材等许多方面都有了巨大的发展，并将我国的钢桁梁桥建设推向了一个新的高潮。本课题主要研究单线铁路72米下承式栓焊简支钢桁梁桥的主桁杆件内力计算，主桁杆件截面设计，弦杆拼接计算和下弦端节点设计以及挠度验算和上拱度设计。主桁杆件的内力图式简化成由主桁杆件的轴线形成的平面铰接桁架。我利用此次毕业设计，将之前所学的理论知识与工程实际结合起来，培养了我独立分析解决桥梁设计和施工中遇到实际问题的能力。通过这些计算设计能对钢桁架梁桥有深入的专业性认知，对桥梁建设更深入的掌握。24000
毕业论文关键词： 钢桁梁桥；下承式；主桁杆件；影响线
Single-track railway 72 meters under the deck bolt welded simply supported steel truss bridge design
Abstract: With the continuous development of the times and the economy , aspects of the design of steel truss bridge , manufacturing , steel and others have used a huge development , the construction of China 's steel truss bridge toward a climax . With the design concept of the development of society constantly changes , its design specifications and design tools with the development of new materials , new technology and constantly updated . The main subject of study single-track railway 72 meters under the deck bolted and welded steel truss bridge simply supported main truss member forces calculation , the main truss rod section design , calculation and chord chord splice end nodes and design as well as checking on the camber deflection design . Internal force main truss rod simplified schema into a flat hinged truss rod from the axis of the main truss formed . In the main action , the main truss rod internal force calculation method is the use of seeking money in structural mechanics learned influence line . By these calculations designed to steel truss bridge in-depth professional knowledge, on a deeper grasp of the bridge construction .
Keywords:steel truss bridge；under the deck；maintrussrod；influence line
目录
1 绪论 1
1.1 课题的目的和意义 1
1.2 国内外研究现状与水平 1
1.3 发展趋势 2
1.4 先行研究 2
1.5 本设计（论文）的主要研究方法 3
2 设计资料 4
2.1基本资料 4
2.2 设计内容 4
2.3 设计要求 4
3 主桁杆件内力计算 5
3.1 主力作用下主桁杆件内力计算 5
3.1.1 恒载假定 5
3.1.2 影响线面积计算 5
3.1.3 活载计算 6
3.1.4 恒载内力和活载内力 7
3.1.5 列车横向摇摆力产生的弦杆内力 9
3.2 横向风力 10
3.2.1平纵联效应的弦杆附加力 11
3.2.2 桥门架效应的端斜杆和端下弦杆附加力 12
3.3 制动力 13
3.3.1 下弦杆E0E2制动力 14
3.3.2 下弦杆E2E4制动力 14
3.4 疲劳内力计算 15
3.4.1 疲劳轴力 15
3.4.2 吊杆疲劳弯矩 15
3.5 主桁杆件内力组合 17
4 主桁杆件截面计算 19
4.1 主桁杆件的截面形式 19
4.2 主桁杆件外轮廓尺寸的确定 19
4.3 上弦杆截面设计 20
4.4 下弦杆截面设计 22
4.5 端斜杆截面设计 23
4.6 中间斜杆截面设计 25 单线铁路72米下承式栓焊简支钢桁梁桥设计+CAD图纸:http://www.751com.cn/gongcheng/lunwen_17443.html