设计参数对刚性索自锚式悬索桥受力性能的影响分析.pdf

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1、第13卷第8期铁道科学与工程学报Volume13Number82016年8月JournalofRailwayScienceandEngineeringAugust2016设计参数对刚性索自锚式悬索桥受力性能的影响分析陈淮王艳朱倩2(1.郑州大学土木工程学院，河南郑州450001;2.广东省冶金建筑设计研究院，广东广州510080)摘要：以平顶山市建设东路立交桥——刚性索自锚式悬索桥为实例，研究地锚式与自锚式悬索桥受力差异，探讨混凝土收缩、徐变对结构力学性能的影响，分析主缆矢跨比、主梁拱度、主梁抗弯刚度、主缆与吊杆的弹性模量等结构设计参数的变化对桥梁力

2、学性能的影响规律。计算结果表明：中、小跨径刚性索自锚式悬索桥主梁轴力较地锚式悬索桥大很多，主梁的变形和其他内力差别不大；混凝土的收缩、徐变使主梁的变形和受力有较大程度的增加；设置主梁拱度和增大主缆弹性模量能有效降低主梁的内力和变形，结构刚度显著提高；增大主梁竖向抗弯刚度能有效控制桥梁变形但内力略有增加；增加吊杆弹性模量对桥梁的受力影响较小；增加矢跨比可加大桥梁竖向刚度但同时主梁轴向压力却相应减小，应综合选用。所得结论可为该类桥型设计提供参考。关键词：刚性索自锚式悬索桥;设计参数;力学性能；有限元法中图分类号:U448.25文献标志码:A文章编号=1672

3、-7029(2016)08-1563-06Impactanalysisonmechanicalbehaviordesignparametersofself-anchoredsuspensionbridgewithrigidcableCHENHuai1,WANGYai^^HUQian2(1.SchoolofCivilEngineering,ZhengzhouUniversity,Zhengzhou450001,China；2.GuangdongMetallurgicalArchitecturalDesign&ResearchInstitute,Guangz

4、hou510080,China)Abstract：TakingtheoverpassofPingdingshanJiansheroad,whichisaself-anchoredsuspensionbridgewithrigidcable,asanexample,thispaperinvestigatedtheeffectofmechanicalbehaviorofconcreteshrinkagecreeponthestructuralmechanicsperformance.Meanwhile,theinfluencesofspanratioofth

5、emaincable,camber,flexuralrigidityofmaingirderandthemodulusofelasticityofcableandsuspenderwerediscussed.Theresultsshow：themaingirder5saxialforceofmediumandsmallspanself-anchoredsuspensionbridgewithrigidcableisgreaterthanthatofearth-anchoredsuspension.Therearelittledifferencesbetw

6、eenthemaingirder5sdisplacementandinternalforce.Thetheoryofelasticitymaybeadoptedtoanalyzeself-anchoredsuspensionbridgewithrigidcable.Maingirder5sdisplacementandinternalforcecanbeenhancedbecauseoftheconcreteshrinkagecreep.Settingupthemaingirder5scamberandamplifyingthecable?smodulu

7、sofelasticitycanavailablyreducethemaingirder5sdisplacementandinternalforce,thestructuralstiffnesscanbeobviouslyimprovedaswell.Thebridge?sdisplacementcanbeavailablycontrolledbyincreasingtheverticaldeflectionresistancestiffness,buttheinternalforcecanbeslightlyenlarged.Theincreaseof

8、thesuspender^smodulushasalittleeffectonb