悬索桥上、下对合型索夹结构分析研究

《悬索桥上、下对合型索夹结构分析研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、桥梁建设2013年第43卷第3期(总第220期)60BridgeConstruction，Vo1．43，No．3，2013(TotallyNo．220)文章编号：1003—4722(2013)03—0060—06悬索桥上、下对合型索夹结构分析研究黎志忠，蒋劲松(四川省交通运输厅公路规划勘察设计研究院，四川成都610041)摘要：为研究悬索桥上、下对合型索夹结构的受力特性，以柳州双拥大桥为背景，推导了理想排列的主缆在宏观受力意义下的横向弹性模量的上限值，并结合经验公式确定主缆横向弹性模量的取值范围。

2、建立该桥主缆和索夹有限元模型，分析主缆横向弹性模量在一定范围内变化时的螺杆附加力系数、索夹内压系数和脱空角。结果表明，吊索力是造成上、下索夹内压应力分布明显不均匀的直接原因，增大螺杆夹紧力能增大索夹内压应力；吊索产生的螺杆附加力对主缆横向弹性模量变化不敏感；索夹内压系数在吊索力和主缆力作用下会相应变小；螺杆附加力应该考虑螺栓和被连接件的相对刚度影响；跨中索夹应从控制脱空角入手适时调整螺杆夹紧力。关键词：悬索桥；主缆索夹；弹性模量；螺杆附加力；内压系数；脱空角；有限元法中图分类号：U448．25文献

3、标志码：AAnalysisandStudyofCableBandStructureofUpperandLowerHalvesTypeforSuspensionBridgeLJZhi—zhong．JIANGJing—song(HighwayPlanning，Survey，DesignandResearchInstitute，DepartmentofTransport，SichuanProvince，Chengdu610041，China)Abstract：Tostudythemechanicalpr

4、opertiesofthecablebandstructureofupperandlowerhalvestypeforsuspensionbridge，theShuangyongBridgeinLiuzhouwascitedasanexample．Theupperlimitvalueoftransverseelasticmodulusoftheideallyarrayedmaincablesustainingmacroscopicsenseforcewasderivedandwithreferen

5、cetotheempiricalformulae，thevaluerangeofthetransverseelasticmodulusofthemaincablewasdetermined．Thefiniteelementmodelforthemaincableandcablebandwasestablished，theboltadditiona1forcecoefficientsandtheinnerpressurecoefficientsanddisengaginganglesofthecab

6、lebandunderchangingofthetransversee—lasticmodulusinacertainrangewereanalyzed．TheresultsoftheanalysisshowthattheSUS—penderforceisthedirectcauseleadingtotheobviousnon-uniformityoftheinnerpressurestressdistributionintheupperandlowerhalvesofthecableband．T

7、heincreaseofthegrippingforcesoftheboltscanincreasetheinnerpressurestressofthecableband．Theboltadditionalforcepro—ducedbythesuspenderforceisnotsensitivetothechangingofthetransverseelasticmodulusandtheinnerpressurecoefficientsofthecablebandwillaccording

8、lybecomelessundertheforcesofthesuspendersandmaincable．Fortheboltadditionalforces，theinfluencesoftherelativestiff—nessoftheboltsandmemberstobeconnectedshouldbeconsideredandforthecablesbandatmidspan，thegrippingforcesoftheboltsshouldbetimelyadjus