考虑节点刚度的钢桁腹连续箱梁桥多尺度分析
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摘要
为探究某在建4×60 m钢桁腹-混凝土连续箱梁桥新型桥梁结构的工作性能,建立精细化非线性节点模型,求解节点转动刚度曲线,并通过界面连接关系,建立适用于连续组合桥梁腹杆与负弯矩区受力性能研究的多尺度模型。研究结果表明:考虑组合节点初始转动刚度时,成桥状态腹杆受弯矩较小,可采用节点铰接的简化设计方法;负弯矩区腹板在弦杆和腹杆共同作用下,上部受拉下部受压,应力呈阶梯状分布,其中受腹杆轴力影响最大,应沿主拉应力迹线方向配置预应力钢束;竖向荷载作用下顶板存在正剪力滞效应,节点处顶板存在负剪力滞效应。
In order to explore the mechanical performance of the 4×60 m steel truss web-concrete continuous box girder bridge, a refined nonlinear joint model was established. Based on the rotation stiffness curve of the interface connection, a multiscale model was built for the mechanical behavior of the steel truss webs and the negative moment region of the continuous composite bridge. The results shows that the moment in web member are less when considering the initial rotational stiffness. The simplified design method with hinge joint can be adopted through comparison. Under the combined action of the chord and the web member, the upper parts of the web on the support are tensioned and the lower parts are compressed, the stress distribution is like a stairway in the negative moment region. Axis force in the web member influence is greatly on the web. The prestressed tendon can be set along the web's principal tensile direction. Under vertical load, in the upper plane there is an active shear lag effect, and the negative shear lag in the upper plane near the supports.
In order to explore the mechanical performance of the 4×60 m steel truss web-concrete continuous box girder bridge, a refined nonlinear joint model was established. Based on the rotation stiffness curve of the interface connection, a multiscale model was built for the mechanical behavior of the steel truss webs and the negative moment region of the continuous composite bridge. The results shows that the moment in web member are less when considering the initial rotational stiffness. The simplified design method with hinge joint can be adopted through comparison. Under the combined action of the chord and the web member, the upper parts of the web on the support are tensioned and the lower parts are compressed, the stress distribution is like a stairway in the negative moment region. Axis force in the web member influence is greatly on the web. The prestressed tendon can be set along the web's principal tensile direction. Under vertical load, in the upper plane there is an active shear lag effect, and the negative shear lag in the upper plane near the supports.
引文
[1]聂建国.钢-混凝土组合结构桥梁[M].北京:人民交通出版社,2011.NIE Jianguo.Steel and concrete composite bridge[M].Beijing:China Communication Press,2011.
[2]王海波,尹国安,李一竹,等.外接式钢桁-槽型梁组合桁架节点模型试验研究[J].铁道科学与工程学报,2015,12(2):323-329.WANG Haibo,YIN Guoan,LI Yizhu,et al.Experiment study on external steel truss-trough girder composite truss joints[J].Journal of Railway Science and Engineering,2015,12(2):323-329.
[3]Reis A J,oliveia-Pedro J J.The Europe bridge in Portugal:concept and structural design[J].Journal of Constructional Steel Research,2004,60(3/5):363-372.
[4]EL Sarraf R,Iles D,Momtahan A,et al.Steel-concrete composite bridge design guide[M].Wellington:New Zealand Transport Agency,2013.
[5]Toshio N,Satoru O,Toshiaki K.Study on strengthening performance of joints in pc hybrid truss bridges(part2)-static loading test with 1/2-scale model specimen[R].Obayashi Corporation Technical Research Report,2005,69:1-6.
[6]王倩,刘玉擎,黄生富.桁腹式组合桥梁节点构造研究[C]//第18届全国桥梁学术会议论文集.北京:人民交通出版社,2008:1030-1034.WAN Qian,LIU Yuqing,HUANG Shengfu.Study the construction of joint on abdominal truss of combination bridge[C]//Proceedings of Eighteenth National Conference.Beijing:China Communications Press,2008:1030-1034.
[7]周凌宇,贺桂超.大跨度钢-混凝土组合桁架铁路桥端节点模型试验研究[J].土木工程学报,2012,45(1):92-99.ZHOU Lingyu,HE Guichao.Model test for the end joint of long-span steel-concrete composite truss railway bridges[J].China Civil Engineering Journal,2012,45(1):92-99.
[8]尹国安,王海波.一种钢-混组合桁架桥下弦杆节点极限承载力研究[J].土木工程学报,2016,49(4):88-95.YIN Guoan,WANG Haibo.Study on ultimate bearing capacity of steel-concrete composite truss bridge bottom-chord joints[J].China Civil Engineering Journal,2016,49(4):88-95.
[9]黄昊.铁路钢-混凝土组合桁架桥的静动力特性研究[D].北京:北京交通大学,2016.HUANG Hao.Static and dynamic analysis of railway steel-concrete composite trussed bridge[D].Beijing:Beijing Jiaotong University,2016.
[10]孙林林,蒋丽忠,周旺宝.钢-混凝土组合箱梁剪力滞系数实用计算方法[J].铁道科学与工程学报,2017,14(6):1287-1293.SUN Linlin,JIANG Lizhong,ZHOU Wangbao.Practical calculation method of shear lag coefficient of steelconcrete composite box beam[J].Journal of Railway Science and Engineering,2017,14(6):1287-1293.
[11]LI Z X,ZHOU T Q,CHAN T H T,et al.Multi-scale numerical analysis on dynamic response and local damage in long-span bridges[J].Engineering Structures,2007,29(6):1507-1524.
[12]李兆霞.大型土木结构多尺度损伤预后的现状、研究思路与前景[J].东南大学学报(自然科学版),2013,43(5):1111-1121.LI Zhaoxia.State of the art in multi-scale damage prognosis for major infrastructures[J].Journal of Southeast University(Natural Science Edition),2013,43(5):1111-1121.
[13]陆新征,林旭川,叶列平.多尺度有限元建模方法及其应用[J].华中科技大学学报(城市科学版),2008,25(4):76-80.LU Xinzheng,LIN Xuchuan,YE Lieping.Multi-scale modeling method and its application[J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2008,25(4):76-80.
[14]周萌,宁晓旭,聂建国.系杆拱桥拱脚连接结构受力性能分析的多尺度有限元建模方法[J].工程力学,2015,32(11):150-159.ZHOU Meng,NING Xiaoxu,NIE Jianguo.Multi-scale FEA modeling method for mechanical behavior analysis of arch feet on tied arch bridges[J].Engineering Mechanics,2015,32(11):150-159.
[15]ZHOU Meng,NIE Jianguo.Multi-scale modeling method for main cable anchorage zone of self-anchored suspension bridge[J].Bridge Construction,2014,44(1):11-17.
[2]王海波,尹国安,李一竹,等.外接式钢桁-槽型梁组合桁架节点模型试验研究[J].铁道科学与工程学报,2015,12(2):323-329.WANG Haibo,YIN Guoan,LI Yizhu,et al.Experiment study on external steel truss-trough girder composite truss joints[J].Journal of Railway Science and Engineering,2015,12(2):323-329.
[3]Reis A J,oliveia-Pedro J J.The Europe bridge in Portugal:concept and structural design[J].Journal of Constructional Steel Research,2004,60(3/5):363-372.
[4]EL Sarraf R,Iles D,Momtahan A,et al.Steel-concrete composite bridge design guide[M].Wellington:New Zealand Transport Agency,2013.
[5]Toshio N,Satoru O,Toshiaki K.Study on strengthening performance of joints in pc hybrid truss bridges(part2)-static loading test with 1/2-scale model specimen[R].Obayashi Corporation Technical Research Report,2005,69:1-6.
[6]王倩,刘玉擎,黄生富.桁腹式组合桥梁节点构造研究[C]//第18届全国桥梁学术会议论文集.北京:人民交通出版社,2008:1030-1034.WAN Qian,LIU Yuqing,HUANG Shengfu.Study the construction of joint on abdominal truss of combination bridge[C]//Proceedings of Eighteenth National Conference.Beijing:China Communications Press,2008:1030-1034.
[7]周凌宇,贺桂超.大跨度钢-混凝土组合桁架铁路桥端节点模型试验研究[J].土木工程学报,2012,45(1):92-99.ZHOU Lingyu,HE Guichao.Model test for the end joint of long-span steel-concrete composite truss railway bridges[J].China Civil Engineering Journal,2012,45(1):92-99.
[8]尹国安,王海波.一种钢-混组合桁架桥下弦杆节点极限承载力研究[J].土木工程学报,2016,49(4):88-95.YIN Guoan,WANG Haibo.Study on ultimate bearing capacity of steel-concrete composite truss bridge bottom-chord joints[J].China Civil Engineering Journal,2016,49(4):88-95.
[9]黄昊.铁路钢-混凝土组合桁架桥的静动力特性研究[D].北京:北京交通大学,2016.HUANG Hao.Static and dynamic analysis of railway steel-concrete composite trussed bridge[D].Beijing:Beijing Jiaotong University,2016.
[10]孙林林,蒋丽忠,周旺宝.钢-混凝土组合箱梁剪力滞系数实用计算方法[J].铁道科学与工程学报,2017,14(6):1287-1293.SUN Linlin,JIANG Lizhong,ZHOU Wangbao.Practical calculation method of shear lag coefficient of steelconcrete composite box beam[J].Journal of Railway Science and Engineering,2017,14(6):1287-1293.
[11]LI Z X,ZHOU T Q,CHAN T H T,et al.Multi-scale numerical analysis on dynamic response and local damage in long-span bridges[J].Engineering Structures,2007,29(6):1507-1524.
[12]李兆霞.大型土木结构多尺度损伤预后的现状、研究思路与前景[J].东南大学学报(自然科学版),2013,43(5):1111-1121.LI Zhaoxia.State of the art in multi-scale damage prognosis for major infrastructures[J].Journal of Southeast University(Natural Science Edition),2013,43(5):1111-1121.
[13]陆新征,林旭川,叶列平.多尺度有限元建模方法及其应用[J].华中科技大学学报(城市科学版),2008,25(4):76-80.LU Xinzheng,LIN Xuchuan,YE Lieping.Multi-scale modeling method and its application[J].Journal of Huazhong University of Science and Technology(Urban Science Edition),2008,25(4):76-80.
[14]周萌,宁晓旭,聂建国.系杆拱桥拱脚连接结构受力性能分析的多尺度有限元建模方法[J].工程力学,2015,32(11):150-159.ZHOU Meng,NING Xiaoxu,NIE Jianguo.Multi-scale FEA modeling method for mechanical behavior analysis of arch feet on tied arch bridges[J].Engineering Mechanics,2015,32(11):150-159.
[15]ZHOU Meng,NIE Jianguo.Multi-scale modeling method for main cable anchorage zone of self-anchored suspension bridge[J].Bridge Construction,2014,44(1):11-17.