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摘要

摘要

近几十年来，由于我国科学技术的进步，工业水平的提高，桥梁建筑技术得以讯速发展。千里江面的座座跨江大桥，现代高速公路迂回交叉的立交桥，高架桥和城市高架道路，以及更长的跨海湾，海峡大桥，城郊高速铁路与轻轨运输高架桥等，犹如一条条“彩虹”使得天堑变通途。并逐步建成立体交通网络，极大地改变了我国的交通状况，拉动了国民经济的发展，方便了广大人民群众的生活。在这些桥梁中不仅有华丽富贵的斜拉桥，气势雄伟的悬索桥，钢筋铁骨的钢桥，体形优美，历史悠久的拱桥，也有外表朴实却适应性强、施工方便、投资小、效益高的刚架桥、连续--刚构桥.

其中，预应力混凝土连续刚构桥以结构受力性能好、变形小、伸缩缝少、行车平顺舒适、造型简洁美观、养护工程量小、抗震能力强等而成为最富有竞争力的主要桥型之一。随着预应力技术的发展和不断完善，尤其是悬臂等先进施工方法的出现，更使预应力混凝土连续刚构桥如虎添冀而活跃在整个桥梁工程领域，无论是城市桥梁、高速公路、山区高架桥，还是跨越江河湖滨大桥，预应力混凝土连续刚构桥都以它独特的魅力，而取代其他桥型成为优胜方案。另外，从国内外已建成的钢桥、钢筋混凝土及预应力混凝土连续梁体系的修建总数来看，预应力混凝土连续梁刚构桥已远远超过半数，充分表现出预应力混凝土连续梁桥的强大生命力。

同时，回顾一下预应力混凝土桥梁的发展历史也是十分必要，非常有益于展望今后的发展方向。

关键词：连续刚构桥 满堂支架 预应力 迈达斯

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北京工业大学本科生毕业设计

Abstract：

In the last several decades,because of the progress of technology and the exaltation of industry level in our country,The technique of bridge building have been developing in an amazing speed.bridges across the wide rivers,fly-over bridges connecting with the moden highway,viaduct and elevated road over cities,even the longer bridges over the channel and

arm,high - speed railways in the outskirts of the city and light rail for transportation,just look like rainbows which make the natural moat turn into a flat road.in the same time,the traffic network in progress has changed substantially the tansportation condition in China,Stimulated the

national economic growth,fitted the life of large people conveniencely.in these bridges ,there are not only the gorgeous cable stayed bridge,the majestic suspension bridge ,the strong steel bridge,the beautiful,richly historied arch bridge,but also the rigid frame bridge and continuous rigid frame bridge whose outward appearance is simple but good at adaptability and performance,which make the construction convenience and the investment less.

Above all,continuous rigid frame bridge of prestressed concrete become one of the main patterns of the most competition bridge,because of the perfect structure function,small strain,little expansion joint,smooth car driving,simple and pleasing shape,little engineering

maintenance and superiority earthquake-resistant.along with the development and improvement of prestress technology,espacially the introduction of the moden cantilever

construction,continuous rigid frame bridge of prestressed concrete act in the whole field of

bridge engineering in full swing. whether the city bridge,freeway,viaduct in mountain area or the great bridge over rivers ,the continuous rigid frame bridge will win the sucessful blue print with its wonderful fascination to defeat other bridge patterns.otherwise,from the total of steel bridge ,continuous beam system

of reinforced concrete and prestressed concrete which have built both here and abroad,its number has been beyond the half,expressing the strong vitality of the continuous rigid frame bridge of prestressed concrete

At the same time,it is nacessary to review the history of pestressed concrete bridge’s development,so is the prospect of the direction in future.

Key word：continuous rigid frame bridge;full framing;prestress;Midas

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第一章 绪论

目录

摘要..........................................................................................................................................I Abstract....................................................................................................................................II 第一章 绪论............................................................................................................................1 1.1 桥梁在交通事业中的地位.....................................................................................1 1.2 我国桥梁的发展概况.............................................................................................1 第二章 方案设计.........................................................................................................3 2,1 大桥概况......................................................................................................................3 2.2 设计依据及标准..........................................................................................................3 2.3 主要材料......................................................................................................................3 2.4 桥面铺装......................................................................................................................4 2.5 支座强迫位移..............................................................................................................4 2.6 温度影响......................................................................................................................4 2.7 桥梁方案选择..............................................................................................................4 2.8 主体结构设计..............................................................................................................7 第三章 结构模型及计算参数.......................................................................................13 3.1 结构离散化的基本原则..............................................................................................13 3.2 计算模型和施工阶段划分..........................................................................................13 3.3 悬臂节段划分..............................................................................................................13 3.4 材料特性和计算参数..............................................................................................16 3.5 施工环境和温度模式..................................................................................................16

第四章 恒载内力计算..................................................................................................17

4.1 毛截面特性计算.........................................................................................................17 4.2 恒载集度计算.............................................................................................................18 4.3 时程内力计算.............................................................................................................19 4.4 恒载内力结果.............................................................................................................22 第五章 活载内力计算及内力组合.............................................................................29 5.1 汽车、人群活载内力计算.........................................................................................29 5.2 温度次内力计算.........................................................................................................34 5.3 支座沉降次内力计算.................................................................................................37 5.4 荷载组合及内力包络图.............................................................................................39

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