欢迎来到天天文库
浏览记录
ID:36510713
大小:380.43 KB
页数:5页
时间:2019-05-11
《斜拉桥双向倾斜桥塔主动横撑设计及施工控制》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)BridgeConstruction,Vo1.43,No.3,2013(TotallyNo.220)109文章编号:1003—4722(2013)03—0109—05斜拉桥双向倾斜桥塔主动横撑设计及施工控制李毅(大连理工大学土木建筑设计研究院,辽宁大连116023)摘要:为了提高双向倾斜桥塔在施工过程中的稳定性和安全性,需要合理设计横撑作为临时结构,并对其进行施工控制。以某斜塔空间扭索双索面斜拉桥方案为背景,在对全桥模型进行复核和施工阶段计算后,提出横撑设置方案;对主动横撑施工过程进行监控,并对施工误差进
2、行分析,对拆除横撑的施工控制方法及横撑拆除时机进行研究。得出如下结论:在主动横撑设计时应主要控制中塔柱根部混凝土截面应力,以内力控制为主、变形控制为辅的原则确定主动横撑预顶力;主动横撑的预顶力值确定应该包括模型受力计算值、温度影响值以及焊接变形所产生的内力变化值;施工过程中需要提高塔柱施工、横撑焊接的质量,并合理安排横撑的拆除时机。关键词:斜拉桥;桥塔;主动横撑;双向倾斜;预项力;误差分析;施工控制中图分类号:U448.27文献标志码:ADesignandConstructionControlofActiveCrossBracinforBidirect
3、ionalTiltingPylonofCable—StayedBridgeLJ(DesignInstituteofCivilEngineering8LArchitecture,DalianUniversityofTechnology,Dalian116023,China)Abstract:Toimprovethestabilityandsafetyofthebidirectionaltitlingpylonofcable~stayedbridgeintheconstructionprocess,thecrossbracingsusedasthetemp
4、orarystructuresforthePY—lonshouldbereasonablydesignedandtheconstructioncontrolofthebracingsshouldbeproperlycarriedout.Aproposedcable—stayedbridgewithatiltingpylonandspatialtwistingdoublecableplaneswascitedasanexampleandafterthemodelofthewholecable~stayedbridgewascheckedandthecon
5、structionstageswerecalculated,theschemeforsettingofthebracingswasputfor—ward.Theconstructionprocessofthebracingswasmonitoredandcontrolled,theconstructiontoleranceswereanalyzedandtheconstructioncontrolmethodsandtherighttimeforremovalofthebracingswerestudied.Theconclusionsdrawnfro
6、mtheanalysisandstudyarethefollowing:whenanactivecrossbracingforthepylonisdesigned,thestressincrosssectionofthefootingconcreteofthemiddlepyloncolumnshouldbecontrolledmainly,thepre-jackingforceofthebracingshouldbedeterminedontheprinciplethattheinternalforceshouldbecontrolledmainly
7、whilethedeformationshouldbecontrolledsubsidiarily.Thedeterminationofthepre-jackingforcevaluesofthebracingshouldincludethecalculatedvaluesoftheforcesofthemodel,thetemperatureinfluentialvaluesandthechangedvaluesoftheinternalforcecausedbytheweldingdeformation.Intheconstructionproce
8、ss,theconstructionqualityofthepyloncolumnsandth
此文档下载收益归作者所有