在上承式钢管混凝土拱桥拱肋吊装施工中,常以两岸交界墩代替扣索塔, 并利用引桥向两岸传递扣索与锚索产生的不平衡力这种施工方法省去了扣索 塔,能够充分利用自身结构与地形条件,在工程中获得了成功的应用 由于山区地形条件复杂,常将引桥设计成曲线桥对于弯曲引桥来说,在 纵向荷载作用下的受力状况会复杂得多,弯曲引桥在不平衡纵向荷载作用下将 可能出现引桥的弯曲变形及混凝土湿接缝开裂!交界墩应力过大!交界墩位移 过大影响拱肋吊装精度等问题 本文以湖北省交通厅科技项目)钢管混凝土拱桥设计及施工控制关键技 术研究景阳河大桥为工程背景,围绕/弯曲引桥作为钢管拱吊装扣锚平衡系统 的可行性0的问题展开首先,采用桥梁专业有限元计算软件MIDAS/CIVIL建 立了有限元计算模型,分析了弯曲引桥采用不同支座时!扣锚不平衡力作用下 结构的受力和变形,论证该工程利用弯曲引桥作为钢管拱吊装扣锚平衡系统的 可行性然后,考虑到现场工程师计算方便,根据最小势能原理建立了扣锚不 平衡力作用下弯曲引桥的简化计算模型,提出了基于能量原理的扣锚不平衡力 作用的弯曲引桥的计算方法,得出了弯曲引桥纵向位移与横向位移的计算公式, 并编制了MATLAB分析计算程序景阳河大桥的施工监测数据与上述两种方法 分析计算结果的比较表明,基于能量原理的扣锚不平衡力作用下弯曲引桥的计 算方法满足工程要求 研究表明:景阳河大桥弯曲引桥情况下钢管拱肋吊装中以交界墩代替扣索 塔,并以弯曲引桥作为钢管拱吊装打!锚平衡系统的施工方法是可行的;基于能 量原理的扣锚不平衡力作用的弯曲引桥的计算方法是一种简便有效的计算方 法,计算结果具有满意的精度,可以供今后类似工程参考 关键词:不平衡纵向力,弯曲引桥,能量法,钢管混凝土拱桥Abst邝Ct Intheconstruetionofrib#assemblingofdeektyPeeoncrete一filledsteeltubular (CFS劝arehbridge,theinstallationtower15usuallyrePlaeedwithjuneturePie-and theunbalaneedaxialloadeausedbyeableseouldbetransferredtotheriverbanksby aPProachbridge.Thiseonstruetionmethodeannotonlyavoidusinginstallation towerbutalsosubstantiallymakeuseofstruetureandtoPograPhiealeondition.Ithas beensuceessfullyaPPliedinsomeProjectS. 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KeyWords:unbalancedaxialload:curvedaPProaehbridge:energymethod: CFSTarehbridge 了目录 第1章绪论.........................................................................................................1 1.1概述.........................................................................................................1 1.1.1.钢管混凝土拱桥的施工方法简述.............................................1 1.1.2.以引桥作为钢管拱吊装扣锚平衡系统施工方法介绍.............2 1.2国内外研究现状...................................................2 1.3课题的来源及工程背景.................................4 1.4课题的研究意义............................................#4 1.5本文所作的主要工作.............................................................................5 第2章弯曲引桥扣锚平衡系统有限元法计算分析.........................................6 2.1工程概况.................................................................................................6 2.2扣锚平衡体系不平衡纵向荷载产生原因及其控制.............................7 2.3纵向不平衡力作用下弯曲引桥有限元分析.........................................8 2.3.1.计算模型......................................................................#8 2.3.2.计算荷载工况...........................................................................10 2.3.3.各墩水平反力计算分析...........................................................n 2.3.4.应力计算...................................................................................n 2.3.5.位移计算..................................................................................#13 2.4有限元计算结果与施工监测数据比较分析.......................................16 2.5本章小结...............................................................................................17 第3章基于能量原理弯曲引桥扣锚平衡系统的简化算法.............................19 3.1能量原理的基本概念...........................................................................19 3.1.1.引一言...........................................................................................19 3.1.2.应变能.......................................................................................19 3.1.3.卡氏第一定理................................................!.#.....#19 3.1.4.最小势能原理...........................................................................21 3.1.5.瑞利一里兹法.................................................22 3.2基于能量原理的弯曲引桥乎7}锚平衡系统的简化算法........................23 3.2.1.形函数的建立....................................,................................233.2.2.基于形函数求纵向位移!横向位移!切向位移和参数久...25 3.2.3.基于形函数求结构总应变能U...............................................27 3.2.4.基于形函数求不平衡纵向荷载所作的功...............................28 3.2.5.计算系统的总势能n..............................................................28 3.2.6.求参数d与v............................................................................29 3.2.7.求纵向位移!横向位移和切向位移..........................,......犯 3.2.8.求弓}桥各墩位移.......................................................................33 3.2.9.求桥面板混凝土湿接缝应力...................................................35 3.3简化算法MATLAB计算程序的编制.................................................35 3.3.1输入程序的参量.......................................................................36 3.3.2程序的内容...............................................................................36 3,4本章小结............................................................,............................41 第4章基于能量原理弯曲引桥扣锚平衡系统简化算法的工程应用.............42 4.1弯曲引桥扣锚平衡系统简化算法的工程实例分析...........................42 4.1.1.计算模型...................................................................................42 4.1.2.荷载工况.......................................................................!.....44 4.1.3.简化算法MATLAB计算程序变量的输入.............................44 4.1.4.MATLAB程序分析计算结果分析.........................................45 4.2比较分析........................................................................!....!......48 4.2.1.简化算法计算结果与有限元计算结果!施工监测数据比较..,48 4.2.2.简化算法与有限元法的计算结果比较...................................49 4.3本章小结...............................................................................................51 第5章总结与展望...........................................................................................52 5.1总结........................................................................,........................52 5.2展望.......................................................-.........................................52