欢迎来到天天文库
浏览记录
ID:37389694
大小:4.68 MB
页数:151页
时间:2019-05-23
《钢管混凝土拱桥施工监控方法研究及工程应用》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、北京工业大学博士学位论文钢管混凝土拱桥施工监控方法研究及工程应用姓名:陈少峰申请学位级别:博士专业:结构工程指导教师:周锡元;闫维明20070401北京I:业人学I:学博}:学f帚论文3.钢管混凝土拱肋混凝土徐变效应研究。通过对混凝土基本徐变理论的分析,及主要混凝土徐变的计算理论、徐变系数计算模式的系统比较和总结,针对钢管混凝土拱桥提出了混凝土基本徐变影响系数及混凝土包络徐变影响系数的概念,并给出了适合钢管拱内环境、受力以及工作条件下的徐变系数计算模式以及混凝土徐变的计算方法。采用本文提出的方法,针对各种施工工况和工作环境分别通过有限元理论分析和施工现场钢管应力的实时数据,
2、得到了钢管混凝土拱桥的混凝土包络徐变影响系数,并给出其发展趋势。通过比较同种情况下空钢管拱肋与钢管混凝土拱肋的钢管应力值,分析推断混凝土徐变效应在钢管混凝土拱肋不同控制截面的影响程度,为钢管混凝土拱桥设计考虑混凝土徐变效应提供依据及准则。关键词:钢管混凝土拱桥;施工监控;索力优化;风致抖振:混凝土徐变.H.Concrete-filledsteeltubular(CFST)structure,gettingdevelopedrecentlyinChina,isanowkindoftechnologyappliedtotheengineeringprojectofthelong
3、-spanarchbridge.Thisstructuralmodelofbridgeisofthecharacteristicsofllighstrength,largestiffness,lightweight,simpleshape,longspan,andshortconstructionperiod.Itprovidespracticalsolutionstosuchproblemsashowtousfithematerialseconomically,simplifytheconstructionmethod,andimprovetheloadingcapaci
4、ty.Itisafavorablemodelforthelong-spanarchbridgestructure.Fortheconstructionofthelong-spanarchbridgewiththeCFSTstructure,thekeyteclmologiesa托controlmethod,optimizationofcableforceduringassemblingthesteeltubulararchrib,concretecreepeffect,andthecontrolofwind—inducedvibrationduringtheconstruc
5、tion.1rI塘researchesarefocused011thekeytechnologiesmentionedabovefortheconstructionofCFSTlong-spanarchbridgeinthisthesis.1.Thecentrelandoptimizationmethodsareinvestigatedforthecableforceduringthebridgeconstruction.111ecalculatedresultsareexactlybyusingthemechanicalnlcoryforthesteeItubularar
6、chbecauseofitsmaterialbeinghomogenous.11ledifferencesbetweenthecalculatedvaluesandtheobservedvaluesareselectedasthedata[鼎:lUenCe,andthegraycontrolmodelisestablishedtorealizethecontroIeITor.Thequadraticsurflofwe-elevationvalueofarchribisselectedastheobjectfunction.Theconstraintconditionsarc
7、thesafetyfactorofthecabletension,theenntrolsectionofsteeltube,andtheheightmarkofthecontrolpoint.Thenonlinearoptimizingmodelisestablishadfinally.Thecabletensionandthequadraticsulnofthepre—elevationvalue(s)callbecalculatedbyusingthegeneticanditerativeoptimalalgo
此文档下载收益归作者所有