预张拱桥
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摘要
为了提高拱桥的刚度、稳定性、动力性能,提出了一种新的拱桥——预张拱桥,其结构原理是在1/4、1/2和3/4拱肋处设置刚性竖联连接拱肋与主梁,分别用预张索将跨中刚性竖联底部与1/4、3/4截面刚性竖联顶部连接,并施加预张力。从而预张拱桥的整体性、刚度和稳定性得到大幅提高,同时预张索的水平分力减小了部分拱脚推力。有限元分析表明,在不增加材料用量的前提下,通过减少横撑和吊杆材料用量来设置刚性竖联和预张索,预张拱桥的刚度、稳定性、动力性能等多项力学指标均优于传统柔性吊杆拱桥,拱肋最大压应力略有增加。新的结构体系对拱桥实现刚度提升、突破稳定性瓶颈提供了新的有效途径,并具有一定的美学价值和较好的工程应用前景,是一种具有竞争力的新桥型。
In order to improve the rigidity,stability and dynamic performance of arch bridge,a new type of arch bridge—pretensioned arch bridge is proposed. Its structural principle is to set up rigid vertical connection between arch and main beam in 1/4,1/2 and 3/4 section,a pretensioned cable is installed between rigid vertical top of 1/4,3/4 span and bottom of 1/2 span,and then pretension is appliedon it.On one hand,integrity,stiffness and stability of pretensioned arch bridge significantly improved; on the other hand,the horizontal component of pretension in 1/4,3/4 span reduces the thrust of the arch foot and the cost of balance of arch thrust. Finite element analysis shows that by reducing the amount of crossbar and boom material to set the rigid vertical and pretensioned cable without increasing the amount of material,the mechanical properties of the pretensioned arch bridge such as rigidity,stability and dynamic performance are much better than the traditional flexible suspension arch bridge,but a slight increase in stress. The new arch bridge is a competitive new bridge type which provides a new effective way for achieving breakthroughs in rigidity and stability of the arch bridge and has great value in engineering application.
In order to improve the rigidity,stability and dynamic performance of arch bridge,a new type of arch bridge—pretensioned arch bridge is proposed. Its structural principle is to set up rigid vertical connection between arch and main beam in 1/4,1/2 and 3/4 section,a pretensioned cable is installed between rigid vertical top of 1/4,3/4 span and bottom of 1/2 span,and then pretension is appliedon it.On one hand,integrity,stiffness and stability of pretensioned arch bridge significantly improved; on the other hand,the horizontal component of pretension in 1/4,3/4 span reduces the thrust of the arch foot and the cost of balance of arch thrust. Finite element analysis shows that by reducing the amount of crossbar and boom material to set the rigid vertical and pretensioned cable without increasing the amount of material,the mechanical properties of the pretensioned arch bridge such as rigidity,stability and dynamic performance are much better than the traditional flexible suspension arch bridge,but a slight increase in stress. The new arch bridge is a competitive new bridge type which provides a new effective way for achieving breakthroughs in rigidity and stability of the arch bridge and has great value in engineering application.
引文
[1]肖汝诚.桥梁结构体系[M].北京:人民交通出版,2013.
[2]赵人达,张正阳.我国钢管混凝土劲性骨架拱桥发展综述[J].桥梁建设,2016,46(6):45-50.
[3]陆新民,姜军,孙胜江,等.钢管混凝土劲性骨架拱桥施工稳定性分析[J].公路,2010(2):51-54.
[4]李宏江,张劲泉,刘汉勇,等.钢筋混凝土拱桥使用现状及其可靠性评估进展[J].公路工程,2016,41(2):89-98.
[5]黄盛楠,陆新征,郑建春,等.超载导致钢筋混凝土拱桥倒塌的破坏模拟[J].工程力学,2012,29(S2):122-127+138.
[6]龚江烈.大跨径钢管混凝土拱桥稳定性非线性有限元分析[J].公路工程,2014,39(5):300-303+310.
[7]周元元.大跨度钢管混凝土拱桥稳定性影响因素研究[D].成都:西南交通大学,2013.
[8] JU S H. Statistical analyses of effective lengths in steel arch bridges[J]. Computers&Structures,2003,81(14):1487-1497.
[9] ROMEIJN A,BOURAS C. Investigation of the arch in-plane buckling behaviour in arch bridges[J]. Journal of the arch inplane buckling behavior in arch bridges,2008,64(12):1349-1356.
[10]高亮,辛涛,肖宏,等.高速铁路桥上不同轨枕型式动力特性对比[J].同济大学学报(自然科学版),2012,40(1):68-72.
[11]马坤,向天宇,赵人达,等.高速铁路钢筋混凝土拱桥长期变形的随机分析[J].土木工程学报,2012,45(11):141-146.
[12]任伟新,胡常福,上官兴,等.空腹式拱桥新型拱轴线研究[J].交通科学与工程,2010,26(2):26-30+47.
[13]卫星,巨云华,吴琛泰,等.高速铁路钢管混凝土拱桥拱轴线型比较分析[J].铁道工程学报,2018,35(3):45-51+83.
[14]项海帆,姚玲森.高等桥梁结构理论[M].北京:人民交通出版社,2001.
[15]姚玲森.桥梁工程(第二版)[M].北京:人民交通出版,2010.
[16] DE B H,OUTTIER A,VAN BOGAERT P. Buckling design of steel tied-arch bridges[J]. Journal of Constructional Steel Research,2014,103:159-167.
[2]赵人达,张正阳.我国钢管混凝土劲性骨架拱桥发展综述[J].桥梁建设,2016,46(6):45-50.
[3]陆新民,姜军,孙胜江,等.钢管混凝土劲性骨架拱桥施工稳定性分析[J].公路,2010(2):51-54.
[4]李宏江,张劲泉,刘汉勇,等.钢筋混凝土拱桥使用现状及其可靠性评估进展[J].公路工程,2016,41(2):89-98.
[5]黄盛楠,陆新征,郑建春,等.超载导致钢筋混凝土拱桥倒塌的破坏模拟[J].工程力学,2012,29(S2):122-127+138.
[6]龚江烈.大跨径钢管混凝土拱桥稳定性非线性有限元分析[J].公路工程,2014,39(5):300-303+310.
[7]周元元.大跨度钢管混凝土拱桥稳定性影响因素研究[D].成都:西南交通大学,2013.
[8] JU S H. Statistical analyses of effective lengths in steel arch bridges[J]. Computers&Structures,2003,81(14):1487-1497.
[9] ROMEIJN A,BOURAS C. Investigation of the arch in-plane buckling behaviour in arch bridges[J]. Journal of the arch inplane buckling behavior in arch bridges,2008,64(12):1349-1356.
[10]高亮,辛涛,肖宏,等.高速铁路桥上不同轨枕型式动力特性对比[J].同济大学学报(自然科学版),2012,40(1):68-72.
[11]马坤,向天宇,赵人达,等.高速铁路钢筋混凝土拱桥长期变形的随机分析[J].土木工程学报,2012,45(11):141-146.
[12]任伟新,胡常福,上官兴,等.空腹式拱桥新型拱轴线研究[J].交通科学与工程,2010,26(2):26-30+47.
[13]卫星,巨云华,吴琛泰,等.高速铁路钢管混凝土拱桥拱轴线型比较分析[J].铁道工程学报,2018,35(3):45-51+83.
[14]项海帆,姚玲森.高等桥梁结构理论[M].北京:人民交通出版社,2001.
[15]姚玲森.桥梁工程(第二版)[M].北京:人民交通出版,2010.
[16] DE B H,OUTTIER A,VAN BOGAERT P. Buckling design of steel tied-arch bridges[J]. Journal of Constructional Steel Research,2014,103:159-167.