混凝土斜拉桥设计

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1、摘要近年来，由于高强钢材、正交异性板、焊接技术的发展及结构分析的进步，斜拉桥体系得到了广泛的应用。斜拉桥为空间结构，由加劲梁—钢或混凝土桥面板和支承部件—受压的桥塔与受拉的斜拉索组成，因其结构性能斜拉体系占据了梁桥和悬索桥的中间地位。本设计为墩、塔、梁固结的单索面预应力混凝土斜拉桥，选择桥梁专用软件MIDAS来建模分析，计算该桥在自重、汽车、温度和支座沉降作用下的作用效应，并进行索塔的作用效应组合；但是，在自重作用下，成桥状态斜拉索的受力很不合理，故采用影响矩阵法对索力进行优化；再根据调整后的索力确定拉索的构造

2、和下料长度；由于斜拉索水平分力的作用，索塔锚固区的混凝土会开裂，须在塔壁内配置闭合预应力筋。关键词　斜拉桥；作用效应组合；索力优化；闭合预应力筋全套CAD图纸，联系-6-AbstractWideandsuccessfulapplicationofcable-stayedsystemswasrealizedonlyrecently,withtheintroductionofhigh-strengthsteels,orthotropictypedeck,developmentofweldingtechniquesa

3、ndprogressinstructuralanalysis.Cable-stayedbridgespresentaspacesystem,consistingofstiffeninggirdersassteelorconcretedeckandsupportingpartsastowersactingincompressionandinclinedcablesintension.Bytheirstructuralbehaviorcable-stayedsystemsoccupyamiddlepositionb

4、etweenthegirdertypeandsuspensiontypebridges.Thecable-stayedbridgeisthesingle-planeandprestressed-concretesystem,whosepier,towerandgirderarerigidlyjoinedtogether.Thedesignchoosesthespecialsoftwareforbridge-MIDAStocreatemodelandrunstructuralanalysis,gettheeffe

5、ctintheactionofdeadload,liveload,temperatureandbearingsubsidence,andthencalculatethecombinationforactioneffectsatthetower.Butcableforcecausedbystructuralweightisveryunreasonable,sothedesignoptimizethecableforceusingtheInfluenceArraymethod.Theninaccordancewit

6、htheaccommodatedcableforce,thedesignportraystheconfigurationofthecablesandcalculatestheirconstructionlength.Intheactionofthehorizontalforce,theconcreteoftheanchorageatthetowerwillcrack,sotheclosedprestressed-steelbarmustbelaidinthetower.Keywords　cable-stayed

7、bridgecombinationforactioneffectsoptimizationofcableforceclosedprestressed-steelbar-6-目录摘要.....................................................................................................................IAbstract..........................................

8、.....................................................................II第1章绪论......................................................................................................11.1概述..........