冰体边界范围对桥墩地震反应的影响研究
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摘要
在考虑冰-水-桥墩流固耦合的基础上,利用有限元分析软件ADINA,研究了不同水深和不同类型地震等条件下,桥墩周围固结海冰的边界范围对桥墩地震反应及动水压力的影响。结果表明:墩身位移和加速度、墩底最大弯矩和剪力随着冰体边界范围的增大而增大,但水深超过桥墩高度的4/5时,冰体边界范围对墩身位移和加速度基本无影响。同时,桥墩侧面动水压力也随着冰体边界范围的增大而增大,且增大程度越来越显著。另外,与冰体边界范围为桥墩横截面尺寸30倍时相比,冰体边界范围为桥墩横截面尺寸40倍时墩底最大弯矩和剪力可增大332.34%和245.20%以上,因此,在进行冰水域桥墩抗震设计时应着重考虑冰体边界范围为桥墩横截面尺寸30倍以上的冰体对结构地震反应的影响。
Based on the fluid-structure interaction of ice-water-bridge pier,the paper considers different earthquake types and different water depths,and studies the effect of ice mass boundary on earthquake response and hydrodynamic pressure by using ADINA.The result shows that the lager the ice mass boundary,the greater the displacement and acceleration along the pier,and the greater the bending moment and shear in the bottom.While the depth of water is beyond 4/5 of the pier,the ice mass boundary has no effectire displacement and acceleration.At the same time,the hydrodynamic pressure in the lateral of the pier becomes larger as the ice mass boundary increases,and the degree of increase is more and more remarkable.The increase rates of the bending moment and the pier shear are 332.34% and 245.2% respectively when the ratio between ice mass boundary and the size of pier cross section is 40 as compared with the ratio being 30.At last,we get a conclusion that we should consider the influence of ice mass on seismic response when the ratio of ice mass boundary range is more than 30 times than the bridge section size range in ice water seismic design of bridge pier.
Based on the fluid-structure interaction of ice-water-bridge pier,the paper considers different earthquake types and different water depths,and studies the effect of ice mass boundary on earthquake response and hydrodynamic pressure by using ADINA.The result shows that the lager the ice mass boundary,the greater the displacement and acceleration along the pier,and the greater the bending moment and shear in the bottom.While the depth of water is beyond 4/5 of the pier,the ice mass boundary has no effectire displacement and acceleration.At the same time,the hydrodynamic pressure in the lateral of the pier becomes larger as the ice mass boundary increases,and the degree of increase is more and more remarkable.The increase rates of the bending moment and the pier shear are 332.34% and 245.2% respectively when the ratio between ice mass boundary and the size of pier cross section is 40 as compared with the ratio being 30.At last,we get a conclusion that we should consider the influence of ice mass on seismic response when the ratio of ice mass boundary range is more than 30 times than the bridge section size range in ice water seismic design of bridge pier.
引文
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[2]王红霞,郭玉贵.山东沿海及近海地区主要地质灾害类型分析[J].中国海洋大学学报,2005,35(5):751-756.
[3]Timco,Tce Force on Multi--legged Structures[C]//Proc.8th Int.Symp on.Ice(TAHR).1986:321-337.
[4]张运良,李志军,林皋,等.冰-结构动力相互作用过程的DDA模拟[J].冰川冻土,2003,25(2):313-316.
[5]Neil C R.Dynamic ice forces on piers and piles:an assessment of design guidelines in the light of recent research[J].Canada Journal of Civil Engineering,1976,3:305-341.
[6]Qianjin Yue,Xiangjun Bi,Xi Zhang,et al.Dynamic ice forces caused by crushing failure,ice in the environme-nt[C]∥Pro-ceedings of the16th IAHR International Symposium on Ice Dunedin.New Zealand,2002:134-141.
[7]季顺迎,沈洪道,王志联,等.基于Mohr-Coulomb准则的黏弹-塑性海冰动力学本构模型[J].海洋学报,2005,27(4):19-30.
[8]柳春光.桥梁结构在地震和冰荷载作用下的响应[J].地震工程与工程振动,2005,25:141-146.
[9]贾玲玲,柳春光.桥墩在冰振作用下的响应分析[J].武汉理工大学学报,2010,32(9):137-139.
[10]濱本卓司,野島稔文.構造物-海氷間隙を有する円筒構造物の地震応答(氷海域における固定式海洋構造物の流力弾性解析その2)[C]//日本建築学会大会学術講演梗概集.2001.
[11]练章华.现代CAE技术与应用教程[M].北京:石油工业出版社,2004.
[12]GB50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
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