考虑地震行波效应的大型水电站高耸进水塔群响应分析
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摘要
本文基于行波法结构振动反应的基本方程,采用直接加速度多点输入模拟大跨度结构在地震空间变化时的结构振动形态,用动接触方法模拟了糯扎渡水电站进水口整体塔群在地震作用下的响应和相邻塔段之间的相互作用。实例计算表明,对于大跨度高耸结构,地震行波效应对塔体动力反应存在一定的影响,设计中需给予考虑。考虑行波效应时塔段之间分缝张开,而且有塔段碰撞现象。考虑地震行波效应与否对塔体顺水流向位移影响不大,对应力分布及最大值也影响不明显。
The seismic response of the high intake tower group in the Nuozadu Hydro project,China,was analyzed based on the equation of traveling wave method for structural vibration.The accelerations at multi-position are directly input to simulate the vibration forms of structure and the dynamic contact method was applied to study the possible dynamic contacts among the towers during the variation of earthquake space.The result indicates that the traveling wave seismic may affect the response of the tower group.The maximum displacement at the top of towers in the direction perpendicular to the flow is about 1.7cm,if the effect of traveling wave is taken into account.It is a little bit larger than that without effect of traveling wave.The joints between towers will open with maximum opening equal to 7.9mm.Slight collision between towers may occur.
The seismic response of the high intake tower group in the Nuozadu Hydro project,China,was analyzed based on the equation of traveling wave method for structural vibration.The accelerations at multi-position are directly input to simulate the vibration forms of structure and the dynamic contact method was applied to study the possible dynamic contacts among the towers during the variation of earthquake space.The result indicates that the traveling wave seismic may affect the response of the tower group.The maximum displacement at the top of towers in the direction perpendicular to the flow is about 1.7cm,if the effect of traveling wave is taken into account.It is a little bit larger than that without effect of traveling wave.The joints between towers will open with maximum opening equal to 7.9mm.Slight collision between towers may occur.
引文
[1]胡聿贤.地震工程学(第二版)[M].北京:地震出版社,2006.
[2]廖振鹏.工程波动理论导论(第二版)[M].北京:科学出版社,2002.
[3]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.
[4]李南生,周晶,林皋.有横缝高拱坝的动力接触模型及其数值解[J].水利学报,1999(12):17-22.
[5]宋战平,李宁,陈飞熊.高拱坝-坝基系统的三维静力非线性数值分析[J].西安建筑科技大学学报,2003,35(4):334-342.
[6]李忠献,岳福青,周莉,等.考虑地震动空间效应的城市高架桥地震碰撞响应分析[J].天津大学学报,2006,39(8):938-943.
[7]DL5073-2000,水工建筑物抗震设计规范[S].
[2]廖振鹏.工程波动理论导论(第二版)[M].北京:科学出版社,2002.
[3]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.
[4]李南生,周晶,林皋.有横缝高拱坝的动力接触模型及其数值解[J].水利学报,1999(12):17-22.
[5]宋战平,李宁,陈飞熊.高拱坝-坝基系统的三维静力非线性数值分析[J].西安建筑科技大学学报,2003,35(4):334-342.
[6]李忠献,岳福青,周莉,等.考虑地震动空间效应的城市高架桥地震碰撞响应分析[J].天津大学学报,2006,39(8):938-943.
[7]DL5073-2000,水工建筑物抗震设计规范[S].
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