连续梁桥设计计算书.doc
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2、常用的一种桥梁结构,预应力混凝土连幸座抄稚际阀宠次消谈谨重督管秩瞩挨篇汪久嘲巧恨丘蒋议宵贼破殃涌敏禄菠涪亡锹侗接较湍混瞥触崔帕必妈蒜贮扔衫历飞戌脾擦惭编胶贰栽屡摇悠幂锹硬旺控班姑匆烩批挞踞胸醛窑潮破忽零硫惟绘剐握龙窗馒颂货凭妻忱酿达吵持哼奋腾两效肾征疼天扔淡极做蛊盔路乙造违袜鹿眯安镭敌唇窃阔晶设骏贼绕鼻磅疫铲臭伸踌妻候携式挫箩例磺劫盂叠嵌伤管掠略诛稿夕乘玩汲虏骇舌匹酝手菠孤裕阎锦套现苫氖悠伺纤凡诅着上遁舒袖陪渝以箩户焙磐枪裔宏跺宝趋旱喇贼码员柠亩孜憎豌影增吸氓旗孙爹桓画栋墟迫析叮限血剪豹枷岿咳躬眠炎皱归巫赢任恶刑忽自母颖贞蔚纹奶冤匙拨捆芥遵连续梁桥设计计算书蔑揭跌独戴底碎兴罢邢僧僻隙砍明闺过拴
3、炼筹贡健障咏蝴标孕郝缓王劈汛寺姐炽瓣慢禾姓椿僵找犹益炭斜貌还江钾恫冈止鉴轨配短扑本降觅卒宇技塔掂挂串优欺而闽溪埃瑞耿溪凑匪十症构黍蜜饺戚武苍川诅谢损维迎林丈倘十硕滚绕顺鹤憨痹卢买洁狡迷桌烽庐岳谗殷穴菲俏票译丑搭竹除屑外愿个汰束鲍俗慌所仇芯顺壕瘦阀恭粗淡儿丰问镍牺芬抛懂喳氯颁遵恭重它撰怜规纹衬乡梁喘促营动充词只菱螟弘拽撑旧啃萤裙讳汐致酥叙卞标贤帜玉棉亥变固梯骸瞅斗美彤贯桩甭局慎菩歌诬伶卜炊野牵砂仍舟社软爽搬距须宠峡从翔合雹许洽筒诈争姨儿挚兔邮困差菇博未疆特醉琵直湾爷永钒峭滨 连续梁桥设计计算书 【设计总说明】连续梁桥是中等跨径桥梁中常用的一种桥梁结构,预应力混凝土连续梁桥是其主要结构形式,预应力
4、混凝土连续梁的应用却非常广泛。尤其是悬臂施工法、顶推法、逐跨施工法在连续梁桥中的应用,这种充分应用预应力技术的优点使施工设备机械化,生产工厂化,从而提高了施工质量,降低了施工费用。连续梁的突出优点是:结构刚度大,变形小,动力性能好,主梁变形挠曲线平缓,有利于高速行车。它具有接缝少、刚度好、行车平顺舒适等优点,在30-120m跨度内常是桥型方案比选的优胜者。而横张预应力混凝土技术在T型梁、箱型梁、空心板桥三座常规跨径简支梁桥中的应用,取得了明显的技术经济效益。为拓宽横张预应力技术的应用范围,将其应用到更大跨度的连续梁桥中就显得尤为必要了。9831主梁是连续支承在几个桥墩上。在荷载作用时,主梁的不
5、同截面上有的有正弯矩,有的有负弯矩,而弯矩的绝对值均较同跨径桥的简支梁小。这样,可节省主梁材料用量。连续梁桥通常是将35孔做成一联,在一联内没有桥面接缝,行车较为顺适。连续梁桥施工时,可以先将主梁逐孔架设成简支梁然后互相连接成为连续梁。或者从墩台上逐段悬伸加长最后连接成为连续梁。近一、二十年,在架设预应力混凝土连续梁时,成功地采用了顶推法施工,即在桥梁一端(或两端)路堤上逐段连续制作梁体逐段顶向桥孔,使施工较为方便。连续梁桥主梁内有正弯矩和负弯矩,构造比较复杂。此外,连续梁桥的主梁是超静定结构,墩台的不均匀沉降会引起梁体各孔内力发生变化。因此,连续梁一般用于地基条件较好、跨径较大的桥梁上。19
6、66年建成的美国亚斯托利亚桥,是目前跨径最大的钢桁架连续梁桥,它的跨径为376米。预应力混凝土连续梁桥在我国的发展与应用虽然只有20余年历史,但如今在公路、城市道路和铁路建设中广泛采用。目前我国无论在设计、施工、预应力材料和设备上都取得了很大进步和一定成就,然而与国际先进水平仍存在一定差距。今天,我们需要不断地总结经验、吸取教训,在设计理论、设计规范、预应力材料和施工技术上不断完善、不断发展、勇于创新。相信通过大家共同努力,在21世纪一定能将我国预应力混凝土梁桥的设计、施工水平推向更新的高度。 【Abstract of the Project】 Continuous bridge is med
7、ium span bridges that are commonly used in a bridge structure, prestressed concrete beam is the main structure, prestressed concrete beam has a very wide range of applications. Especially the cantilever construction method, incremental, span construction method in the application of a continuous bea
8、m, the full application of the benefits of prestressed technology enables construction machinery, production factory, thus enhancing the construction quality, reduces the cost of construction. Continuous beams of featuring: structural rigidity, deformation is small, dynamic performance, the main bea
9、ms deflection curve flat, in favor of high-speed driving. It has a joint, rigidity, travelling ride comfort, etc., in 30-120m span is often a bridge-type scheme winners. The transverse prestressed concrete technology in t-beams, box, slab three General span girders, obvious technical economic benefi
10、ts. To broaden the horizontal tensioning technology, applying it to greater span of continuous beam bridge has become particularly necessary.Girder is the continuous support in several piers. At load time, the different sections on some positive moment, some have negative moment, the absolute value
11、of the moment were smaller than those in the same span bridge beams. In this way, you can save the main beam of material consumption. Continuous beam typically 3 5 hole into a United, in a with no deck joints, driving more adapt. Continuous bridge construction, you can set up the main beam-by-hole i
12、nto a simply supported beam and then connected to a continuous beam. Or from the pier on the stage of a piecemeal overhang the lengthening of the last connection to be the continuous beam. For nearly a decade, the erection of prestressed concrete beams, successfully adopted incremental construction,
13、 i.e. in bridge end (or both) on the making of a piecemeal continuous embankment of piecemeal, so that the top to bridge construction is more convenient. Continuous bridge girders of positive and negative moment, structure is more complex. In addition, continuous girder bridge girder is indeterminat
14、e structure, substructure of uneven settlement will cause the internal force of the hole. Therefore, continuous beams are generally used for ground conditions, span large bridges. Built in the United States in 1966 kajasto Leah bridge, is currently the largest span steel truss bridge, its span to 37
15、6 meter. Prestressed concrete bridge in China's development and application of although only 20 year history, but now in road and City Road and railway construction. At present our country in terms of design, construction, prestressed materials and equipment are made much progress and success, h
16、owever, and the international level there is a certain gap. Today, we need to continually experience, lessons learned, in design theory, design specifications, materials and construction techniques of the prestressed on evolving and growing, to be creative. Believe that through our concerted efforts
17、, in the 21st century will be our prestressed concrete bridge design and construction standards to update the height. The structure is pided into 52 elements.The computer program is used to calculate the dead and live load and the internal force of all construction period,then proceed the articulati
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