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时间:2020-04-06
《基于支撑弹簧模型的拱桥吊杆杆端弯矩分析.pdf》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2016年第46卷第5期(总第240期)BridgeConstruction,Vol.46,No.5,2016(TotallyNo.240)53文章编号:1003-4722(2016)05-0053-06基于支撑弹簧模型的拱桥吊杆杆端弯矩分析杨建喜1,陈惟珍1,李杰2(1.同济大学桥梁工程系,上海200092;2.同济大学建筑设计研究院(集团)有限公司,上海200092)摘要:拱桥吊杆的弯矩作用是导致其锚固端开裂的主要因素之一,为了准确模拟锚固端的杆端弯矩,将吊杆两端的减振器简化为支撑弹簧,建立支撑弹簧模型,推导吊杆杆端弯矩的解析解,给出支撑弹簧刚度和吊杆截面抗弯刚度的确定方法
2、,并以138s5平行钢丝束吊杆为例,编制MATLAB程序分析支撑弹簧刚度、吊杆截面抗弯刚度和吊杆长度等参数对杆端弯矩的影响,并对吊杆支撑弹簧模型和铰接模型、固结模型进行对比。结果表明:吊杆杆端弯矩随支撑弹簧刚度的增大而逐渐增大并趋于平缓,杆端弯矩随吊杆抗弯刚度的增大而增大;伸入拱肋和桥面系横梁的吊杆长度对杆端弯矩有一定影响;当吊杆长度小于10m时,随着长度增加,杆端弯矩迅速减小;当吊杆长度大于10m时,吊杆长度对杆端弯矩值影响很小,可以忽略不计。关键词:拱桥;吊杆;杆端弯矩;支撑弹簧模型;支撑弹簧刚度;抗弯刚度;吊杆长度中图分类号:U448.22;U443.38文献标志码:AAnal
3、ysisofBarEndBendingMomentofHangersofArchBridgeBasedonSupportSpringModel1,CHENWei-zhen1,LIJie2YANGJian-xi(1.DepartmentofBridgeEngineering,TongjiUniversity,Shanghai200092,China;2.TongjiArchitecturalDesign(Group)Co.,Ltd.,Shanghai200092,China)Abstract:Thebendingmomentactionofthehangersofarchbridgeis
4、oneofthemajorfactorscausingthecracksinthehangersattheirtheanchorageends.Toaccuratelysimulatethebarendbendingmomentofthehangersattheanchorageends,thedampersatthetwoendsofthehangersweresimplifiedasthesupportsprings,themodelforthesupportspringswasestablished,theana-lyticalsolutionsforthebarendbendi
5、ngmomentofthehangerswerederivedandthedeterminationmethodsforthesupportspringstiffnessandthesectionalbendingstiffnessofthehangersweresgiven.Bywayofexampleofthe1385parallelsteelwirestrandhangers,theprogramMATLABwascomplied,theinfluencesoftheparameterslikethesupportspringstiffnessandthesectionalbe
6、ndingstiffnessandlengthofthehangersonthebarendbendingmomentwereanalyzedandthesupportspringmodelwascomparedtothehingemodelandfixitymodel.Theresultsdemonstratethatwiththeincreaseofthesupportspringstiffness,thebarendbendingmomentofthehangersgraduallyincreasesandtendstobegentleandwiththeincreaseofth
7、ebendingstiffnessofthehangers,thebarendbendingmomentalsoincreases.Thelengthofthehangersextendingintothearchribandcrossbeamsofthefloorsystemhascertaininfluencesonthebarendbendingmoment.Whenthelengthofthehangersisshorterthan10
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