带横缝预应力拱坝振动台模型试验与计算分析
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摘要
为了探究施加预应力对带横缝拱坝抗震性能的影响,进行了振动台模型试验.试验模型采用新疆石门子拱坝的三心圆体型及特定刚性地基的方案(用型钢支架实现),研究了带横缝拱坝在动荷载作用下的反应规律.试验和计算结果表明,在施加预应力之后,不仅在一定程度上减小了横缝在强震荷载下的张开度,也在一定程度上提高了非整体拱坝结构的自振频率.与试验结果对比表明,计算预应力拱坝的简化数值模型基本上可以反映出拱坝在动力荷载作用下预应力钢丝或钢索对坝体动力反应的约束作用.
To explore the effect of prestressing forces on the seismic behaviors of arch dams,a set of model tests on shaking table were carried out.The arch dam model was made with a configuration of three-centered circular,which simulated Shi Men Zi arch dam built in Sinkiang.With a shape steel bracket,which simulated rigid foundations,the prestressed model was tested to study the dynamic behaviors of arch dams with contraction joints.The test and calculation results show that with prestressing not only the opening of the contraction joints is distinctly reduced,but also the natural frequency of arch dam increases in some degree.Comparison of the tested and numerical results shows a good agreement and it suggests that the simple numerical model proposed in this paper is reasonable for the arch dams with prestressed cables/wires under dynamic loadings.
To explore the effect of prestressing forces on the seismic behaviors of arch dams,a set of model tests on shaking table were carried out.The arch dam model was made with a configuration of three-centered circular,which simulated Shi Men Zi arch dam built in Sinkiang.With a shape steel bracket,which simulated rigid foundations,the prestressed model was tested to study the dynamic behaviors of arch dams with contraction joints.The test and calculation results show that with prestressing not only the opening of the contraction joints is distinctly reduced,but also the natural frequency of arch dam increases in some degree.Comparison of the tested and numerical results shows a good agreement and it suggests that the simple numerical model proposed in this paper is reasonable for the arch dams with prestressed cables/wires under dynamic loadings.
引文
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[2]赵中极,宋海印.重力坝采用预应力技术的断裂力学研究[J].华北水利水电学院学报,2005,26(1):19-22.Zhao Zhongji,Song Haiyin.The study of prestress-rein-forced concrete gravity dam with fracture mechanics[J].Journal of North China Institute of Water Conser-vancy and Hydroelectric Power,2005,26(1):19-22.(in Chinese)
[3]周维垣,杨若琼,刘耀儒,等.高拱坝整体稳定地质力学模型试验研究[J].水力发电学报,2005,24(1):53-58.Zhou Weiyuan,Yang Ruoqiong,Liu Yueru,et al.Re-search on geomechanical model of rupture tests of archdams for their stability[J].Journal of HydroelectricEngineering,2005,24(1):53-58.(in Chinese)
[4]刘家平,侯俊平,费文平.水工结构模型试验的研究现状[J].中国农村水利水电,2005(8):85-86.
[5]Proulx J,Darbre G R,Kamileris N.Analytical and ex-perimental investigation of damping in arch dams basedon recorded earthquakes[C]//The13th World Confer-ence on Earthquake Engineering.Vancouver,Canada,2004:68.
[6]Lin G,Hu Z Q.Earthquake safety assessment of con-crete arch and gravity dams[J].Earthquake Engineer-ing and Engineering Vibration,2005,4(2):251-264.
[7]郭永刚,孙五继,刘宪亮.高拱坝伸缩横缝间布设抗震钢筋的动力反应分析[J].应用力学学报,2007,24(1):16-21.Guo Yonggang,Sun Wuji,Liu Xianliang.Numericalmodeling of aseismic reinforcement between contractionjoints in high arch dam[J].Chinese Journal of AppliedMechanics,2007,24(1):16-21.(in Chinese)
[8]Fenves G L,Mojtahedi S,Reimer R B.UCB/EERC-89/12ADAP-88—a computer program for nonlinearearthquake analysis of concrete arch dams[R].Collegeof Engineering,University of California at Berkeley:Earthquake Engineering Research Center,1989.
[9]Zhang C H,Xu Y J,Wang G L,et al.Nonlinear seis-mic response of arch dams with contraction joint openingand joint reinforcements[J].Earthquake Engineering&Structural Dynamics,2000,29(10):1547-1566.
[10]Liu X J,Xu Y J,Wang G L,et al.Seismic responseof arch dams considering infinite radiation damping andjoint opening effects[J].J Earthquake Engineeringand Engineering Vibration,2002,1(1):65-73.
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