提高CFRP缆索悬索桥抗风稳定性的结构措施研究.pdf

《提高CFRP缆索悬索桥抗风稳定性的结构措施研究.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、!“桥梁建设2(l1笫l1文章编号：l003～4722(2O11)05002605提-_同．E_】jl--CFRP缆索悬索桥抗风稳定性的结构措施研究梅葵花，毕银博，张浩(长安大学桥梁与隧道陕西省重点实验室，陕西西安7l0064)摘要：为研究大跨度CFRP缆索悬索桥在设计风速下的抗风稳定性，对抗风设计规范中临界风速和颤振稳定系数计算公式进行整理，发现提高悬索桥的竖向弯曲基频和扭转基频可以提高桥梁的抗风稳定性。以日本明石海峡大桥为背景探索性设计了主跨2000m的CFRP缆索悬索桥和钢缆索悬索桥，分别计算了采用2种材料、3种吊索方案(交叉吊索、空间缆索

2、、索桁)的不同桥梁的动力特性。经对比分析得出以下结论：综合交叉索方案可以显著提高对称和反对称扭转振动频率；空间缆索方案扭转频率提高不显著且施工困难；索桁方案各个方向振动频率均得到提高，但材料用量大，施工_7-艺复杂；采用CFRP缆索有利于提高悬索桥的抗风稳定性。关键词：悬索桥；抗风稳定性；有限元法；CFRP缆索；动力特性中图分类号：U448．25文献标志码：AStudyofStructuralMeasuresforImprovingWindResistanceStabilityofLongSpanSuspensionBridgewithCFRPC

3、ablesMEIKui-hua，BIYin-bo，zHANGHao(Ney1．aboratoryforBridgeandTunnelofShanxiProvince，(；hanganUniversity，Xian710064，(hlT1a)Abstract：i'ostudythewindresistancestabilityoflongspansuspensionbridgeuse(twit}】tTFRI’ca})lesunderthedesignedwiIldspeed，thecalculationformu1asrelatecjt()thec

4、riticaiwindspeedaI)(Jflmierstabilitycoefficientsinthewindresistancedesigncodesaresorted。LJlaJ1L{i1ii()L⋯({thaitheimprovingofverticalbendingandtorsionbasefrequenciesofsuspensionbridgccafjl⋯f1)r()Vthewindresistancestabilityofthebridge．WithreferencetotheAkashiKaiky()Bridge。．Iapa

5、rt-lhedesignoftheCFRPcableandsteelcablesuspensionbridgeseachwithan1ainsDan()f2000misstudied．Thedynamiccharacteristicsofdifferentbridgesusedwithtwokindsoftl1ematerialsandthreekindsofsuspenders(crisscrosssuspenders，spatialcablesandcablesand1russ)arcrespectivelycalculated．Thecon

6、clusionsdrawnfromthecomparativeanalysisareIhatlhecrisscrosssuspenderscansignificantlyimprovethesymmetricandasymmetrictorsionalvit)r}ltiorl{requencies．Theimprovingofthetorsionalvibrationfrequenciesbythespatia1cablesisn()tsignificantandtheconslructionisdifficult．Thevibrationfre

7、quenciesofthecablesandtrussina11directionsareimproved，buttheusageamountofmaterialsisgreatandtheconstructionlechr】o1【)gyiscomplicated．TheutilizationoftheCFRPcablesforlongspansuspensionbridgeisneverthelesshelt)JLJ1tOimprovethewindresistancestabilityofthebridge．Keywords：suspensi

8、onbridge；windresistancestability；finiteelenlentmethod；CFRPcaI)k；dyna