非线性子结构方法中实现对结构抗震措施阻尼器的数值模拟
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摘要
应用子结构理论,对设置伸缩横缝的小湾高拱坝结构,分别就正常高水位常遇低水位两种水位工况,考虑坝体伸缩横缝在地震交变荷载作用下反复开合引起的缝面间滑移、接触等效应的影响,坝体-库水的相互作用而产生的动水压力的影响,对坝体的抗震性能进行了地震反应分析。对伸缩缝间设置阻尼器这一新的设计思想进行了可行性的研究,论证推导了阻尼器的计算模型,探讨了阻尼器对坝体结构抗震性能的影响。
The study on earthquake-resistance of high arch dams has always been important research. The paper analyzed the seismic resistance of XIAOWAN arch dam in which the effect of contraction joints to high arch dam were considered. Some nonlinear finite element procedures for high arch dam with consideration of the gradual opening and closing of contraction joints have been developed. Among them the substructure procedure with three-dimensional nonlinear joint element is a more efficient and effective analysis tool for performing additional studies on high arch dam response. In this paper, the property and feasibility of a new design idea about setting damper in the joints of arch dam as an anti-seismic measure of high arch dam in practice is discussed from engineering point of view. A numerical model which simulates the dampers is set and demonstrated. The effects of different water height, contact and sliding of joints and the dam-water interaction to earthquake response of high arch dam are discussed. The effect of the dampers on the seismic-resistance of arch dam is calculated and explored.
The study on earthquake-resistance of high arch dams has always been important research. The paper analyzed the seismic resistance of XIAOWAN arch dam in which the effect of contraction joints to high arch dam were considered. Some nonlinear finite element procedures for high arch dam with consideration of the gradual opening and closing of contraction joints have been developed. Among them the substructure procedure with three-dimensional nonlinear joint element is a more efficient and effective analysis tool for performing additional studies on high arch dam response. In this paper, the property and feasibility of a new design idea about setting damper in the joints of arch dam as an anti-seismic measure of high arch dam in practice is discussed from engineering point of view. A numerical model which simulates the dampers is set and demonstrated. The effects of different water height, contact and sliding of joints and the dam-water interaction to earthquake response of high arch dam are discussed. The effect of the dampers on the seismic-resistance of arch dam is calculated and explored.
引文
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[2] DOW L ING M J. N on linear Se ism ic A na lys is ofA rchD am s [R ]. C a liforn ia Institu te T echno logy, R eportN o. EERL,1987,87-03.
[3] W ARBURTON Son i S R. E rrors in response ca lcu-lations for non-class ica lly dam ped structures [ J ].E arthqu E ng S truct Dyn,1977,5:365-376.
[4]张阿舟,朱德懋.阻尼系统的振动分析[J].航空学报,1984,3:321-331.(ZHANG A-zhou, ZHU D e-m ao.V ibration ana lys is of system cons idering dam p [ J].A cta A eronautica et A stronautica S in ica,1984,3:321-331.( in Ch inese))
[5]郭永刚.高拱坝结构抗震研究[R ].博士后研究工作报告,中国水利水电科学研究院,1999.(GUO Y ong-gang. S tudy on E arthquake-res istan t of H igh A rchD am s S tructure,1999.( in Ch inese))
[6] VARGA S-LLOL I L M, FENVES G L. E ffects ofconcrete crack ing on the earthquake response ofgrav ity dam s [ J ]. E arthquake E ng ineering andS tructura l Dynam ics,1989,18:575-592.
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