PC系杆拱桥施工阶段稳定性及临时横撑影响分析
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摘要
为有效指导PC系杆拱桥的施工,对该类桥梁施工阶段的稳定性及临时横撑对结构稳定性的影响进行研究。以江苏省新建省道336公路桥为背景,采用MIDAS Civil建立桥梁空间有限元模型,对3个施工控制阶段结构的稳定性及临时横撑设置与否、设置位置及形式对暂态拱稳定性的影响进行分析。分析结果表明:该桥施工阶段具有较好的稳定安全系数;施工阶段的吊杆张拉对全桥的稳定性有负影响;对称设置临时横撑时,同类型横撑设置在1/4跨径处效果最为明显;在相同位置设置X形临时横撑对结构稳定性贡献最大;横撑的间距和形式选择还需综合考虑桥梁美学、经济性及施工方便。
To provide effective guidance for the construction of prestressed concrete(PC) tied arch bridge,the stability of the bridge of the same type and the influences of temporary cross bracings on the stability at construction stages were studied.The Highway Bridge 336 on the Provincial Route,Jiangsu was cited as an example,the MIDAS Civil was used to create the spatial finite element model for the bridge,the stability and influences of setting or not setting the temporary cross bracings,positions and types of the bracings at three construction stages on the stability of the arch in temporary status were analyzed.The results of the analysis show that the bridge at the construction stages has good stability safety coefficients.At the construction stages,the tensioning of hangers has negative influence on the stability of the whole bridge.When the temporary cross bracings are symmetrically set,the effect of the bracings of the same type set at 1/4 span is most obvious and the contribution of the X-shape temporary bracings set at the same positions to the stability is the greatest.However,for selection of the spacing distance and types of the bracings,the factors of the aesthetics,economy and construction convenience of the bridge should be comprehensively considered.
To provide effective guidance for the construction of prestressed concrete(PC) tied arch bridge,the stability of the bridge of the same type and the influences of temporary cross bracings on the stability at construction stages were studied.The Highway Bridge 336 on the Provincial Route,Jiangsu was cited as an example,the MIDAS Civil was used to create the spatial finite element model for the bridge,the stability and influences of setting or not setting the temporary cross bracings,positions and types of the bracings at three construction stages on the stability of the arch in temporary status were analyzed.The results of the analysis show that the bridge at the construction stages has good stability safety coefficients.At the construction stages,the tensioning of hangers has negative influence on the stability of the whole bridge.When the temporary cross bracings are symmetrically set,the effect of the bracings of the same type set at 1/4 span is most obvious and the contribution of the X-shape temporary bracings set at the same positions to the stability is the greatest.However,for selection of the spacing distance and types of the bracings,the factors of the aesthetics,economy and construction convenience of the bridge should be comprehensively considered.
引文
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[9]陈宝春.钢管混凝土拱桥设计与施工[M].北京:人民交通出版社,2007.(CHEN Bao-chun.Design and Construction of Con-crete-Filled Steel Tube Arch Bridge[M].Beijing:Chi-na Communications Press,2007.in Chinese)
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[2]曾昭东.钢管混凝土拱桥稳定与极限承载力研究及参数分析[J].中外公路,2009,(3):104-108.(ZENG Zhao-dong.Stability and Ultimate Bearing Ca-pacity Analysis of Concrete-Filled Steel Tube ArchBridge[J].Journal of China&Foreign Highway,2009,(3):104-108.in Chinese)
[3]胡志明,李精英,黄天一.基于行波效应的钢管混凝土拱桥地震反应分析[J].桥梁建设,2010,(1):25-28.(HU Zhi-ming,LI Jing-ying,HUANG Tian-yi.Seis-mic Response Analysis of Concrete-Filled Steel TubeArch Bridge Based on Traveling Wave Effect[J].Bridge Construction,2010,(1):25-28.in Chinese)
[4]许长安.基于杆梁混合单元的系杆拱桥稳定性分析[J].桥梁建设,2009,(5):28-31.(XU Chang-an.Stability Analysis of Tied Arch BridgeBased on Link and Beam Mixed Finite Element[J].Bridge Construction,2009,(5):28-31.in Chinese)
[5]苏庆田,杨国涛,吴冲.吊杆更换对九堡大桥主桥受力性能的影响分析[J].桥梁建设,2011,(4):15-19.(SU Qing-tian,YANG Guo-tao,WU Chong.Analy-sis of Effect of Suspender Replacement on MechanicalBehavior of Main Bridge of Jiubao Bridge[J].BridgeConstruction,2011,(4):15-19.in Chinese)
[6]曹正洲,冯玉涛,沈逢俊.大跨径钢箱提篮拱桥空间稳定性分析[J].桥梁建设,2011,(1):43-47.(CAO Zheng-zhou,FENG Yu-tao,SHEN Feng-jun.Analysis of Spatial Stability of Long Span Steel BoxBasket Handle Arch Bridge[J].Bridge Construction,2011,(1):43-47.in Chinese)
[7]刘钊,吕志涛.有横撑系杆拱桥的侧向稳定承载力[J].工程力学,2004,(3):21-23.(LIU Zhao,LU Zhi-tao.Lateral Buckling Load ofTied-Arch Bridges with Transverse Braces[J].Engi-neering Mechanics,2004,(3):21-23.in Chinese)
[8]刘跃华,李国平.刚性吊杆系杆拱空间稳定性分析[J].上海公路,1999,(3):20-22.(LIU Yue-hua,LI Guo-ping.Analysis of Space Sta-bility of Rigid Suspender of Tied-Arch Bridges[J].Shanghai Highways,1999,(3):20-22.in Chinese)
[9]陈宝春.钢管混凝土拱桥设计与施工[M].北京:人民交通出版社,2007.(CHEN Bao-chun.Design and Construction of Con-crete-Filled Steel Tube Arch Bridge[M].Beijing:Chi-na Communications Press,2007.in Chinese)
[10]陈泽宇.PC系杆拱桥施工稳定性分析(硕士学位论文)[D].成都:西南交通大学,2010.(CHEN Ze-yu.Analysis of Construction Stability ofPC Tied Arch Bridge(Master Dissertation)[D].Chengdu:Southwest Jiaotong University,2010.inChinese)
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