混凝土曲线箱梁桥爬移理论计算与数值分析——以跃村互通式立交桥B匝道桥为工程背景
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摘要
随着混凝土曲线梁桥的大量建立和长期运营,混凝土曲线梁桥呈现出的爬移问题受到业内外的广泛关注。文章以弯梁桥纯扭转分析理论为基础,从理论上推导了收缩徐变、预应力、温度变化、离心力等荷载作用下混凝土曲线箱梁桥位移的计算方法。在此基础上,针对某一实际工程,采用理论计算与数值分析相结合的方法,对其在外荷载作用下的变形情况进行了分析。结果表明:混凝土收缩和温度变化是引起爬移的主要原因。混凝土徐变及预应力对混凝土曲线箱梁桥径向位移可以忽略不计,同时,当车辆按照设计时速和标准载重条件行驶时,离心力对径向位移的影响可以忽略不计。
As the large establishment and long-term operation of concrete curved box girder bridges,the creeping problem has attracted a wide attention inside and outside the industry. The theoretical calculation method of displacement of concrete curved box girder bridge was derived based on the pure torsion analysis theory,and the analysis loads include shrinkage and creep. prestress,temperature and centrifugal force. On this basis,the displacement of a practical project under external loads was analyzed by the theoretical and finite element method. The results show that the concrete shrinkage and temperature change are the main causes of creep; the concrete creep and prestress are negligible for the radial displacement. Meanwhile,when the vehicle runs according to the designed speed and load conditions,the effect on the radial displacement caused by centrifugal force is negligible.
As the large establishment and long-term operation of concrete curved box girder bridges,the creeping problem has attracted a wide attention inside and outside the industry. The theoretical calculation method of displacement of concrete curved box girder bridge was derived based on the pure torsion analysis theory,and the analysis loads include shrinkage and creep. prestress,temperature and centrifugal force. On this basis,the displacement of a practical project under external loads was analyzed by the theoretical and finite element method. The results show that the concrete shrinkage and temperature change are the main causes of creep; the concrete creep and prestress are negligible for the radial displacement. Meanwhile,when the vehicle runs according to the designed speed and load conditions,the effect on the radial displacement caused by centrifugal force is negligible.
引文
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[15] JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[2]刘华,丁汉山.预应力混凝土连续弯箱梁的侧向位移研究[D].南京:东南大学,2004.
[3]谭世霖.弯梁桥梁体偏移成因分析与处治[J].水运工程,2008(11):157-160.
[4]许莉,房贞政,洪适.预应力混凝土曲线连续箱梁桥支座布置研究[J].南昌大学学报(工科版),2009,31(1):83-89.
[5]钱小光.预应力混凝土曲线梁桥支座病害成因分析[J].铁道建筑,2012(8):32-34.
[6]李广慧,袁波.不同支承体系曲线梁桥的受力性能研究[J].郑州大学学报(工学版),2013,34(6):67-71.
[7]赵景周.独柱支撑曲线混凝土连续箱梁桥侧向位移及其加固和限位措施研究[D].西安:长安大学,2011.
[8]赵成功,王小冬,杨德厚,等.既有中小跨径曲线梁桥梁体径向爬移机理分析[J].中外公路,2018,38(3):162-167.
[9] J Tu,XW Yi,QM Wu,etc. Analysis on the lateral creeping of a curved concerte girder bridge[J]. Applied Mechanics&Materials,2015,744-746:845-849
[10]邵容光,夏淦.混凝土弯梁桥[M].北京:人民交通出版社,1994.
[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].北京:人民交通出版社,2004.
[12]王达荣.混凝土曲线箱梁桥爬移机理研究[D].福州:福州大学,2014.
[13]格哈利·布朗.结构分析——经典方法与矩阵方法的统一[M].北京:中国铁道出版社,2008.
[14]杨党旗,崔飞.独墩单铰支座曲线梁桥通病分析及治理[J].城市道桥与防洪,2003(3):35-38.
[15] JTG/T B02-01-2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.