考虑库水可压缩性的重力坝地震响应分析
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摘要
以丰满重力坝重建工程为例,采用ANSYS-FSI流固耦合方法,考虑库水可压缩性对重力坝动力特性的影响,建立了丰满重力坝代表性坝段的坝体—库水—地基模型,分析了丰满重力坝的自振特性及其在地震作用下的动力时程响应。结果表明,考虑库水可压缩性能显著影响重力坝坝体的自振频率,与空库时相比坝体基频降低约16%,且随自振阶数增加,自振频率相对降低越多;与附加质量模型相比,该模型在设计地震荷载作用下能得到更加合理的坝体位移和应力,为丰满重力坝的抗震性能安全评价提供了有限元分析参考。
Taking reconstruction project of Fengman gravity dam for an example,ANSYS-FSI fluid solid coupling method is used to establish dam-water-foundation model of representative section of Fengman gravity dam by considering the influence of reservoir water compressibility on dynamic behavior of gravity dam.And then the natural vibration characteristics and dynamic time history response are analyzed under action of earthquake.The calculation results show that considering the reservoir water compressibility,the fluid solid coupling model of gravity dam can significantly decrease the natural frequencies of dam;the fundamental frequency is reduced about 16%;with the order of natural frequencies increasing,the relative natural frequencies decrease more.Compared with the additional mass model,the proposed model can obtain more reasonable dam displacements and stresses under the action of designed earthquake loading,which provides finite element analysis reference for the seismic safety evaluation of Fengman gravity dam.
Taking reconstruction project of Fengman gravity dam for an example,ANSYS-FSI fluid solid coupling method is used to establish dam-water-foundation model of representative section of Fengman gravity dam by considering the influence of reservoir water compressibility on dynamic behavior of gravity dam.And then the natural vibration characteristics and dynamic time history response are analyzed under action of earthquake.The calculation results show that considering the reservoir water compressibility,the fluid solid coupling model of gravity dam can significantly decrease the natural frequencies of dam;the fundamental frequency is reduced about 16%;with the order of natural frequencies increasing,the relative natural frequencies decrease more.Compared with the additional mass model,the proposed model can obtain more reasonable dam displacements and stresses under the action of designed earthquake loading,which provides finite element analysis reference for the seismic safety evaluation of Fengman gravity dam.
引文
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[7]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国水利水电出版社,2000.
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[2]杜修力,王进廷.拱坝—可压缩库水—地基地震波动反应分析方法[J].水利学报,2002,33(6):83-90.
[3]王伟华,张燎军.基于ADINA的重力坝地震响应分析[J].水电能源科学,2008,26(1):97-99.
[4]赵堃,王春青,张旸,等.基于ADINA的重力坝流固耦合动力特性分析[J].科技技术与工程,2012,12(32):8 788-8 792.
[5]王铭明,陈健云,范书立.重力坝地震动水压力试验研究[J].水电能源科学,2012,30(5):51-53,89.
[6]杨柳,何蕴龙.考虑库水可压缩性的拱坝动力响应分析[J].长江科学院院报,2013,30(2):71-75.
[7]中国水利水电科学研究院,电力工业部昆明勘测设计研究院,电力工业部西北勘测设计研究院,等.水工建筑物抗震设计规范(DL5073-2000)[S].北京:中国水利水电出版社,2000.
[8]陈厚群,侯顺载,杨大伟.地震条件下拱坝库水相互作用的试验研究[J].水利学报,1989(7):29-39.
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