单向纵坡斜拉桥阻尼器设置研究
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摘要
以一预应力混凝土单向纵坡斜拉桥———南平闽江大桥为对象,在拟定采用液体粘滞阻尼器控制主梁纵向位移的前提下,通过建立的精细有限元模型,进行施工阶段、运营阶段和弹性地震响应分析,从而确定阻尼器主要参数指标.对阻尼器数量与设置位置进行了分析和优化,在综合考虑主梁纵向位移减小量、墩底内力增加量、经济成本和方便施工养护的前提下,给出最优的阻尼器布置方案.研究结果表明,在两主塔下横梁与主梁之间各布置2个阻尼器,可使主梁的纵向位移减小0.139 m,并使主墩墩底的弯矩和剪力大幅降低.施工实测数据结果证明了阻尼器良好的工作性.
Based on applying liquid viscous dampers to control the longitudinal displacement of main girder for a PC cable-stayed bridge with a single-way longitudinal grade,Min River Bridge in Nanping,the finite element model is established to analyze the bridge under construction,service,and earthquake,and then the main parameters of dampers are determined.Besides,the best solution of dampers setting is achieved after analysis and optimizing of dampers number and location considering the longitudinal displacement reduction of main girder,inner force increment in pier bottom,cost and convenience of construction and maintenance.The results show that,when two dampers are placed between lower cross beam and main girder for each tower,the main girder longitudinal displacement is reduced by 0.139 m,and the bending moment as well as shearing force decrease significantly.The validity of dampers is verified by the actual measurement during construction.
Based on applying liquid viscous dampers to control the longitudinal displacement of main girder for a PC cable-stayed bridge with a single-way longitudinal grade,Min River Bridge in Nanping,the finite element model is established to analyze the bridge under construction,service,and earthquake,and then the main parameters of dampers are determined.Besides,the best solution of dampers setting is achieved after analysis and optimizing of dampers number and location considering the longitudinal displacement reduction of main girder,inner force increment in pier bottom,cost and convenience of construction and maintenance.The results show that,when two dampers are placed between lower cross beam and main girder for each tower,the main girder longitudinal displacement is reduced by 0.139 m,and the bending moment as well as shearing force decrease significantly.The validity of dampers is verified by the actual measurement during construction.
引文
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[2]王为圣,周水兴,王新忠,等.单向坡斜拉桥体系转换静力分析[J].重庆交通学院学报,2007,26(3):13-16.
[3]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[4]陈永祁,杜义欣.液体粘滞阻尼器在结构工程中的最新进展[J].工程抗震与加固改造,2006,28(3):65-72.
[5]魏锦涛.液体粘滞阻尼器及其在土木工程中的应用[J].四川建筑科学研究,2006,32(2):124-135.
[6]韩万水,黄平明,兰燕.斜拉桥纵向设置粘滞阻尼器参数分析[J].地震工程与工程振动,2005,25(6):146-151.
[7]蒋建军,蒋劲松.广西南宁大桥液体粘滞阻尼器设计[J].世界桥梁,2007(4):8-10;50.
[8]卢桂臣,胡雷挺.西堠门大桥液体粘滞阻尼器参数分析[J].世界桥梁,2005(2):43-45.
[9]奚灵智,李小刚,韦华.粘滞阻尼器在全漂浮体系斜拉桥抗震设计中的功效分析[J].中外公路,2012,32(2):103-110.
[10]余定军.液体粘滞阻尼器在单向纵坡斜拉桥施工中的应用[J].水运工程,2008(6):157-160.
[11]陈永祁,耿瑞琦,马良喆.桥梁用液体黏滞阻尼器的减振设计和类型选择[J].土木工程学报,2007,40(7):55-61.
[12]吴庆雄,陈宝春,韦建刚.三维杆系结构的几何非线性有限元分析[J].工程力学,2007,24(12):19-24.
[13]吴庆雄,王文平,陈宝春.索梁结构非线性振动有限元分析[J].工程力学,2013,30(3):347-354;382.
[14]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37-42.
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