-范文最新推荐-1 / 48三联连续梁桥跨线箱梁桥设计论文计算书+CAD 图纸目录摘要 31 绪论 72 设计基本资料 92.1.工程概况 92.2.设计参数 92.3.地质资料 93 桥梁结构的总体布置和初步方案拟定 12 3.1 方案一：简支桥梁 123.2 方案二：中承式混凝土拱桥 123.3 方案三：连续梁桥方案 124 方案比选 135 设计要点和结构尺寸拟定 155.1 设计要点 155.2 结构尺寸拟定 166 恒载及附加荷载计算 176.1 程序说明 176.2 计算模型 176.3 自重作用效应的计算 18-范文最新推荐-3 / 486.4 计算内容 187 活载内力的计算 267.1 汽车活载的计算 268 内力组合 278.1 内力组合说明 278.2 内力组合 289 配筋计算及预应力钢束布置 309.1 预应力钢束的计算 309.2 预应力钢束的布置 369.3 预应力钢束数量统计 3710 施工过程分析及应力验算 4010.1 施工阶段的应力验算 4011 正常使用极限状态应力验算 4011.1 规范要求 4011.2 应力验算 4212 梁正截面强度验算 4412.1 验算截面的选取 4412.2 边跨弯矩最大处正截面强度验算 4512.3 跨中正截面强度验算 47致谢参考文献 -范文最新推荐-5 / 48关键词：设计连续梁桥先简支后连续预应力AbstractThe continuous beam bridge is a kind of bridge type used widely on the project. It not only has a reliable strength, stiffness and cracking, but also has a smooth journey comfortable, conservation work on the design and construction experience of the characteristics of maturity. Design a bridge must be laid across from the bridge-laying, the size of the development, steel beam layout and construction methods, but also give full consideration to the design parameters and environmental impact. This is a design for a three-span continuous bridge, whose cross-section is forms a single box with double chamber cast-in-situ box girder. The first design includes constant load, the live load and the calculation of the internal forces. On the basis of a load combination, we can draw moment and shear envelope map. Next, according to the short-term effect combination disposition prestressed reinforcement, and carries on the loss of prestress the computation. Finally, carries on the checking calculation to this continuous bridge, whether to satisfy the design requirements.Continuous girder is supported on several piers. In the loading, different section girder on some positive, some negative bending moment, and the absolute value of the same span bridge beam small. So, can save the girder material dosage. Continuous beam bridge is usually 3 5 hole into a united, no deck joints in a, travel more suitable. Construction of continuous beam bridge, main girder erection can be by hole as simply supported beams are then connected to one another as a continuous beam. Or from the pier on the piecewise overhang extended finally connected into continuous beam. Nearly one, twenty years, in the construction of prestressed concrete continuous beam, successfully using the incremental launching construction, namely in the bridge end (or both) on the embankment piecewise continuous production of beam segmentally to span, the construction is more convenient. Continuous positive bending moment and negative bending beam bridge, construction is complex. In addition, -范文最新推荐-7 / 48the girder continuous beam bridge is a statically determinate structure, the uneven settlement will cause the change of beam hole internal force. Therefore, continuous beam foundation condition is better, generally used for large span bridges. Built in 1966, the United States of America in Astoria bridge, is currently the largest span continuous steel truss girder bridge, its span of 376 meters. Prestressed concrete continuous beam bridge in the development and application in China although only 20 years of history, but now in City Road, road and railway construction is widely used in. At present our country in terms of design, construction, prestressed materials and equipment has made great progress and achievements, but with the international advanced level there is still a certain gap. Today, we need to constantly sum up experience, draw a lesson, in design theory, design, materials and construction technology of prestressed continuous improvement, continuous development, innovation. We believe that through joint efforts, in twenty-first Century we will be able to design and construction of prestressed concrete beam bridges in China, the level to higher level. 预应力混凝土桥梁是在二战前后发展起来的，当时西欧很多国家在战后缺钢的情况下，为节省钢材，各国开始竞相采用预应力结构代替部分的钢结构以尽快修复战争带来的创伤。50 年代，预应力混凝土桥梁跨径开始突破了 100 米，到 80 年代则达到 440 米。虽然跨径太大时并不总是用预应力结构比其它结构好，但是，在实际工程中，跨径小于 400 米时，预应力混凝土桥梁常常为优胜方案。我国的预应力混凝土结构起步晚，但近年来得到了飞速发展。现在，我国已经有了简支梁、带铰或带挂梁的 T 构、连续梁、桁架拱、桁架梁和斜拉桥等预应力混凝土结构体系。虽然预应力混凝土桥梁的发展还不到 80 年。但是，在桥梁结构中，随着预应力理论的不断成熟和实践的不断发展，预应力混凝土桥梁结构的运用必将越来越广泛。-范文最新推荐-9 / 48连续梁和悬臂梁作比较：在恒载作用下，连续梁在支点处有负弯矩，由于负弯矩的卸载作用，跨中正弯矩显著减小，其弯矩与同跨悬臂梁相差不大；但是，在活载作用下，因主梁连续产生支点负弯矩对跨中正弯矩仍有卸载作用，其弯矩分布优于悬臂梁。虽然连续梁有很多优点，但是刚开始它并不是预应力结构体系中的佼佼者，因为限于当时施工主要