考虑非线性影响的下承式钢拱桥地震响应
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摘要
为研究下承式钢拱桥的非线性地震响应和损伤机理,结合徐州京杭运河大桥工程,采用考虑非线性的计算方法,分析了下承式钢拱桥在强震作用下的地震响应和损伤情况。结果表明,下承式钢拱桥具有良好的抗震性能,在强震作用下损伤程度不明显;在考虑几何非线性与材料非线性条件下,拱顶面外弯矩显著增大;考虑非线性对结构横向振动与竖向振动位移响应的影响基本一致;下承式钢拱桥在拱脚、风撑端部及拱肋容易发生损伤;风撑作为连接构件是横向地震作用下的薄弱环节,在地震高烈度地区设计该类桥梁时,对上述薄弱环节应予以重视。
Nonlinear seismic response analysis was carried out to study the seismic response and damage mechanism of long span steel through arch bridges which were subjected to strong earthquake.Taking the Beijing-Hangzhou canal bridge in Xuzhou as an example,the seismic response and damage of the bridge under strong earthquake were calculated.The results showed that steel through arch bridges had preferable seismic resistant ability and yielded only limited damage under strong earthquake action.The moment for out of plane significantly increased when considering the geometric and material nonlinear state,while the effect of the geometric and material nonlinear state on the transversal and the vertical displacement response was consistent.Steel through arch bridge was prone to be damaged at arch base,lateral bracing and arch rib.Lateral bracings were the weakness of the structure under the lateral earthquake action.We should pay more attention to these weak parts in case this type of bridge is built in a high earthquake intensity area.
Nonlinear seismic response analysis was carried out to study the seismic response and damage mechanism of long span steel through arch bridges which were subjected to strong earthquake.Taking the Beijing-Hangzhou canal bridge in Xuzhou as an example,the seismic response and damage of the bridge under strong earthquake were calculated.The results showed that steel through arch bridges had preferable seismic resistant ability and yielded only limited damage under strong earthquake action.The moment for out of plane significantly increased when considering the geometric and material nonlinear state,while the effect of the geometric and material nonlinear state on the transversal and the vertical displacement response was consistent.Steel through arch bridge was prone to be damaged at arch base,lateral bracing and arch rib.Lateral bracings were the weakness of the structure under the lateral earthquake action.We should pay more attention to these weak parts in case this type of bridge is built in a high earthquake intensity area.
引文
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[2]Cheng J,Jiang J J,Xiao R C,et al.Ultimate load carrying capacity of the Lu Pu steel arch bridge under static wind loads[J].Computer and Structures,2003,81(3):61-73.
[3]汤岳飞.下承式钢桁架拱桥E1地震作用分析研究[J].结构工程师,2011,27(1):93-97.Tang Yuefei.Structural Engineers,2011,27(1):93-97.
[4]杜思义,陈淮,王宝聚.某下承式钢管混凝土拱桥抗震分析[J].郑州大学学报:理学版,2007,39(3):158-162.Du Siyi,Chen Huai,Wang Baoju.Journal of Zhengzhou University:Engineering Science,2007,39(3):158-162.
[5]Sakai J,Kawashima K.Seismic response of a reinforced concrete arch bridge taking account of axial force and moment interaction[J].Journal of Structural Mechanics and Earthquake Engineering,2003(724):69-81.
[6]Usami T,Ge H,Hioki K,et al.Seismic performance upgrading of steel arch bridges using structural control dampers against transverse directional earthquake motions[J].Journal of Structural Mechanics and Earthquake Engineering,2004(766):245-261.
[7]崔军.大跨度钢管混凝土拱桥受力性能分析[D].杭州:浙江大学,2003.Cui Jun.Structural characteristic study on large span CFST arch bridge[D].Hangzhou:Zhejiang University,2003.
[8]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.Fan Lichu,Hu Shide,Ye Aijun.Seismic design of large span bridge[M].Beijing:People's Communications Press,2001.
[9]段红霞,李守巨,刘迎曦.地震作用下钢结构损伤过程数值模拟[J].工程力学,2011,28(2):198-204.Duan Hongxia,Li Shouju,Liu Yingxi.Engineering Mechanics,2011,28(2):198-204.
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