槽内水深对渡槽-水体耦合结构抗震性能的影响
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摘要
采用有限元数值计算方法,研究槽内水深的变化对渡槽-水体耦合结构抗震性能的影响。数值结果表明,水体的存在使得渡槽结构的振动频率降低,在地震作用下,"U"形渡槽中水体的晃动幅度十分显著,从而改变了槽身地震反应性态。槽内水体对渡槽结构的影响程度与输入地震波的谱特性有很大关系,当输入地震波的主频范围覆盖渡槽结构基频,且槽内水体的振动频率与渡槽结构基频相近时,槽内水体对渡槽结构可以起到类似调谐液体阻压器(TLD)的减震效应,并对槽内水体减震效应的条件进行了判别。
The effects of water depths in aqueduct on the seismic performance of aqueduct-water coupling structure are studied by using finite element method.The results show that:(a) the vibration frequency of the structure is reduced due to the existence of water and the response wave of aqueduct body is changed as very significant sloshing amplitude of the water in U-shape aqueduct;(b) the effects has great relationship with the spectrum dynamic properties of the input earthquake wave,and water body in aqueduct can play TLD damping when the frequency scale of earthquake wave covers the structure fundamental frequency and the water vibration frequency is closed to the structure fundamental frequency.The approximate criterion is also put forward to adjudge.
The effects of water depths in aqueduct on the seismic performance of aqueduct-water coupling structure are studied by using finite element method.The results show that:(a) the vibration frequency of the structure is reduced due to the existence of water and the response wave of aqueduct body is changed as very significant sloshing amplitude of the water in U-shape aqueduct;(b) the effects has great relationship with the spectrum dynamic properties of the input earthquake wave,and water body in aqueduct can play TLD damping when the frequency scale of earthquake wave covers the structure fundamental frequency and the water vibration frequency is closed to the structure fundamental frequency.The approximate criterion is also put forward to adjudge.
引文
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[4]徐建国,陈淮,王博,等.考虑流固动力相互作用的大型渡槽地震响应研究[J].土木工程学报,2005,38(8):67-73.
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[6]吴轶,莫海鸿,杨春.大型矩形渡槽-水体耦合体系的动力性能分析[D].地震工程与工程振动,2004,24(4):137-142.
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[8]段秋华.大型渡槽结构振动台模型试验及抗震性能研究[D].上海:同济大学,2008.
[2]李遇春,楼梦麟.排架式渡槽流-固耦合动力特性分析[J].水利学报,2000,12(1):31-37.
[3]徐建国,陈淮,王博.渡槽结构考虑流固耦合的横向地震响应研究[J].工程力学,2004,21(6):197-202.
[4]徐建国,陈淮,王博,等.考虑流固动力相互作用的大型渡槽地震响应研究[J].土木工程学报,2005,38(8):67-73.
[5]刘云贺.流体-固体动力耦合理论及水利工程应用[D].西安:西安交通大学,2001.
[6]吴轶,莫海鸿,杨春.大型矩形渡槽-水体耦合体系的动力性能分析[D].地震工程与工程振动,2004,24(4):137-142.
[7]吴轶,莫海鸿,杨春.三维排架渡槽中水的调频液体阻尼效应[J].水利学报,2005,36(9):1115-1120.
[8]段秋华.大型渡槽结构振动台模型试验及抗震性能研究[D].上海:同济大学,2008.
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