基于欧洲规范的刚果(布)2座钢结构桥梁的设计
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摘要
刚果(布)国家1号公路二期工程罗库尼大桥(Loukouni Bridge)主桥为跨度86m的上承式钢箱拱桥,朱埃河大桥(Djoué Bridge)主桥为跨度60m的简支钢-混结合梁桥。基于欧洲规范,从混凝土、钢材、钢筋等设计材料的选取,车道划分方法、交通荷载模式、疲劳荷载模式等方面,介绍这2座钢结构桥梁的设计内容。结构分析表明,2座桥梁均不需要考虑二阶效应;有效截面的确定需要考虑剪力滞效应及局部屈曲效应两方面因素,对于剪力滞导致的有效截面,用于整体分析时与各极限状态下截面验算时的有效截面的计算不相同,对于局部屈曲导致的有效截面,欧洲规范通过截面的分类来确定。结构验算表明,结构的承载能力极限状态、正常使用极限状态、疲劳极限状态均满足欧洲规范的要求。
The Loukouni Bridge is part of the second-stage extension of the No.1 National Highway in the Republic of the Congo,the main bridge of which is an 86-m long deck-type steel box arch bridge.The main bridge of the DjouéRiver Bridge is a 60 mlong simply-supported steelconcrete composite beam bridge.In accordance with the Euro Codes,the designs of the two steel bridges are introduced from the selection of materials like concrete,steel,reinforcement,the way how the traffic lanes are divided and the traffic loads and fatigue loads chosen.The structural analysis indicates that there is no need to consider second-order effect for the two bridges.To determine the effective cross sections,both the shearing lag effect and local buckling effect should be taken into account.In calculating the effective cross sections caused by shearing effect,the methods used in the overall analysis and in various extreme conditions are different,but in the Euro Codes,the effective cross sections caused by local buckling are determined via the classification of cross sections.The checking calculation indicates that the ultimate limit state,serviceability limit state and fatigue limit state of the structure all meet the requirements of the Euro Codes.
The Loukouni Bridge is part of the second-stage extension of the No.1 National Highway in the Republic of the Congo,the main bridge of which is an 86-m long deck-type steel box arch bridge.The main bridge of the DjouéRiver Bridge is a 60 mlong simply-supported steelconcrete composite beam bridge.In accordance with the Euro Codes,the designs of the two steel bridges are introduced from the selection of materials like concrete,steel,reinforcement,the way how the traffic lanes are divided and the traffic loads and fatigue loads chosen.The structural analysis indicates that there is no need to consider second-order effect for the two bridges.To determine the effective cross sections,both the shearing lag effect and local buckling effect should be taken into account.In calculating the effective cross sections caused by shearing effect,the methods used in the overall analysis and in various extreme conditions are different,but in the Euro Codes,the effective cross sections caused by local buckling are determined via the classification of cross sections.The checking calculation indicates that the ultimate limit state,serviceability limit state and fatigue limit state of the structure all meet the requirements of the Euro Codes.
引文
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[2]黎述亮.海外公路工程项目的勘察设计探析[J].公路工程,2014(5):194-198.
[3]EN 1991-2:2003Eurocode 1:Actions on Structures—Part 2:Traffic Loads on Bridges[S].
[4]EN 1992-2:2005Eurocode 2:Design of Concrete Structures part 2:Concrete Bridges—Design and Detailing Rules[S].
[5]EN 1993-1-9:2005Eurocode 3:Design of Steel Structures—Part 1-9:Fatingue[S].
[6]EN 1994-2:2005Eurocode 4:Design of Composite Steel and Concrete Structures—Part 2:General Rules and Rules for Bridges[S].
[7]贡金鑫,车轶,李荣庆.混凝土结构设计(按欧洲规范)[M].北京:中国建筑工业出版社,2009.
[8]黎述亮,杨勇,李俊,等.欧洲规范中公路桥梁设计活载分析[J].世界桥梁,2011(5):52-55.
[9]李学有,杨勇,李俊,等.欧洲规范下公路钢筋混凝土桥梁设计分析[J].中外公路,2013(2):149-154.
[10]JTG D60-2015,公路桥涵设计通用规范[S].
[11]JTG D62-2004,公路钢筋混凝土及预应力混凝土桥涵设计规范[S].
[12]JTG D64-2015,公路钢结构桥梁设计规范[S].
[13]张健新,李艳艳,戎贤.HRB500钢筋混凝土桥墩承载能力及延性性能研究[J].桥梁建设,2015,45(3):58-62.
[14]边兆军,徐飞萍,陈仁山,等.中心布置无粘结预应力钢筋的高强预应力混凝土桩弯曲试验研究[J].世界桥梁,2013,41(2):41-48.
[15]申俊昕,刘斌,李翠,等.云南龙江大桥主桥结构设计与整体分析[J].桥梁建设,2014,44(1):89-94.