锚索索力损失对预应力闸墩动态特性的影响
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摘要
某水电站泄洪闸采用大吨位预应力闸墩承受弧形闸门支臂传递的巨大水推力,通过近2年的闸墩锚索拉力监测发现,锚索张拉力损失部分超过15%,并尚未收敛,且闸墩在宣泄洪水过程中曾出现过强烈振动现象.为进一步明确锚索拉力损失是否对闸墩动态特性(包括模态特性、动位移与动应力特性)产生影响,建立了闸墩-基础-锚索整体有限元模型,通过制作闸墩水力学模型并采用力传感器测量作用于闸墩上的整体面荷载,获取不同运行工况下的闸墩整体水动力荷载时程线,以此为有限元模型输入荷载进行闸墩动态响应计算,分析了泄洪闸预应力闸墩主、次锚索不同索力损失对闸墩的动态特性的影响,研究成果可为工程安全运行提供重要参考.
Large-tonnage prestressed pier of a hydropower station is applied to resist huge hydraulic thrust from the radial gate arms. Pier cable tension monitoring in nearly two years shows that part of the anchor tensile force had lost by more than 15% and not converged,and that the pier had strong vibration during the flood discharge. In order to clarify the influence of the anchor cable force losses on dynamic characteristics of the pier( including modal characteristic,dynamic displacement and dynamic stresses),a finite element overall model of pier-foundationanchor is established,and the pier hydraulic model measuring the overall surface loads acting on the pier surface is set up to obtain the overall hydrodynamic loads under different operating conditions. Then,the overall surface loads are taken as the input loads for calculation of pier dynamic response,and analysis of the influence of primary and secondary anchor cable force losses on the pier dynamic characteristics is made. Those research results can provide an important reference for the safe operation of the same projects.
Large-tonnage prestressed pier of a hydropower station is applied to resist huge hydraulic thrust from the radial gate arms. Pier cable tension monitoring in nearly two years shows that part of the anchor tensile force had lost by more than 15% and not converged,and that the pier had strong vibration during the flood discharge. In order to clarify the influence of the anchor cable force losses on dynamic characteristics of the pier( including modal characteristic,dynamic displacement and dynamic stresses),a finite element overall model of pier-foundationanchor is established,and the pier hydraulic model measuring the overall surface loads acting on the pier surface is set up to obtain the overall hydrodynamic loads under different operating conditions. Then,the overall surface loads are taken as the input loads for calculation of pier dynamic response,and analysis of the influence of primary and secondary anchor cable force losses on the pier dynamic characteristics is made. Those research results can provide an important reference for the safe operation of the same projects.
引文
[1]李振龙,李守义,范瑞朋.里底水电站溢洪道竖井式预应力闸墩应力及应变分析[J].水资源与水工程学报,2009,20(5):140-143.(LI Zhen-long,LI Shou-yi,FAN Rui-peng.Stress and strain analysis of the spillway silo prestressed pier of Lidi hydropower station[J].Journal of Water Resources&Water Engineering,2009,20(5):140-143.(in Chinese))
[2]张微微,彭刚,陈灯红,等.江坪河溢洪道预应力边墩三维有限元分析研究[J].中国农村水利水电,2008(12):113-115.(ZHANG Wei-wei,PENG Gang,CHEN Deng-hong,et al.3-D FEM analysis of the left side prestressed pier of Jiangpinghe hydropower station[J].China Rural Water and Hydropower,2008(12):113-115.(in Chinese))
[3]张微微,彭刚,陈灯红,等.江坪河预应力闸墩静动力有限元分析研究[J].世界地震工程,2008,24(4):159-163.(ZHANG Wei-wei,PENG Gang,CHEN Deng-hong,et al.Seismic response analysis of prestressed pier of Jiangpinghe project by 3D-FEM[J].World Earthquake Engineering,2008,24(4):159-163.(in Chinese))
[4]赵春,张军,杨国祥,等.五强溪大坝表孔预应力闸墩应力复核[J].河海大学学报:自然科学版,2008,36(5):624-627.(ZHAO Chun,ZHANG Jun,YANG Guo-xiang,et al.Stress recheck of pre-stressed pier for surface outlets in Wuqiangxi Dam[J].Journal of Hohai University(Natural Sciences),2008,36(5):624-627.(in Chinese))
[5]郭宏磊,贺采旭,何亚伯.预应力闸墩体内锚束锚固区受力性能研究[J].武汉水利电力大学学报,1996,29(1):59-64.(GUO Hong-lei,HE Cai-xu,HE Ya-bo.Study on behavior of anchorage zone of tendon in internal prestressed sluice pier[J].Journal of Wuhan University of Hydraulic and Electric Engineering,1996,29(1):59-64.(in Chinese))
[6]张世宝,张淙皎,解伟.大型泄洪排沙闸预应力闸墩结构模型试验研究[J].水力发电学报,2009,28(4):92-96.(ZHANG Shi-bao,ZHANG Cong-jiao,XIE Wei.Study on model test for a large scale pre-stressed pier of a flood releasing and scouring sluice[J].Journal of Hydroelectric Engineering,2009,28(4):92-96.(in Chinese))
[7]陈震,徐远杰.基于弹塑性损伤模型的预应力闸墩非线性有限元分析[J].武汉大学学报:工学版,2012,43(4):481-484.(CHEN Zhen,XU Yuan-jie.Nonlinear finite element analysis of prestressed pier based on elastoplastic damage model[J].Engineering Journal of Wuhan University,2012,43(4):481-484.(in Chinese))
[8]练继建,杨敏,李火坤,等.高坝泄流工程[M].北京:中国水利水电出版社,2008.(LIAN Ji-jian,YANG Min,LI Huokun,et al.Hydrodynamics for high dam[M].Beijing:China WaterPower Press,2008.(in Chinese))
[9]彭刚,陈灯红,姚艳华,等.江坪河预应力闸墩动力响应分析[J].三峡大学学报:自然科学版,2008,30(4):1-4.(PENG Gang,CHEN Deng-hong,YAO Yan-hua,et al.Dynamic response analysis of prestressed pier of Jiangpinghe project[J].Journal of China Three Gorges University(Natural Sciences),2008,30(4):1-4.(in Chinese))
[10]练继建.泄洪闸闸墩泄洪振动研究[R].天津:天津大学水利工程仿真与安全国家重点实验室,2013.(LIAN Ji-jian.A study of flow induced vibration of sluice piers[R].Tianjin:State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,2013.(in Chinese))
[2]张微微,彭刚,陈灯红,等.江坪河溢洪道预应力边墩三维有限元分析研究[J].中国农村水利水电,2008(12):113-115.(ZHANG Wei-wei,PENG Gang,CHEN Deng-hong,et al.3-D FEM analysis of the left side prestressed pier of Jiangpinghe hydropower station[J].China Rural Water and Hydropower,2008(12):113-115.(in Chinese))
[3]张微微,彭刚,陈灯红,等.江坪河预应力闸墩静动力有限元分析研究[J].世界地震工程,2008,24(4):159-163.(ZHANG Wei-wei,PENG Gang,CHEN Deng-hong,et al.Seismic response analysis of prestressed pier of Jiangpinghe project by 3D-FEM[J].World Earthquake Engineering,2008,24(4):159-163.(in Chinese))
[4]赵春,张军,杨国祥,等.五强溪大坝表孔预应力闸墩应力复核[J].河海大学学报:自然科学版,2008,36(5):624-627.(ZHAO Chun,ZHANG Jun,YANG Guo-xiang,et al.Stress recheck of pre-stressed pier for surface outlets in Wuqiangxi Dam[J].Journal of Hohai University(Natural Sciences),2008,36(5):624-627.(in Chinese))
[5]郭宏磊,贺采旭,何亚伯.预应力闸墩体内锚束锚固区受力性能研究[J].武汉水利电力大学学报,1996,29(1):59-64.(GUO Hong-lei,HE Cai-xu,HE Ya-bo.Study on behavior of anchorage zone of tendon in internal prestressed sluice pier[J].Journal of Wuhan University of Hydraulic and Electric Engineering,1996,29(1):59-64.(in Chinese))
[6]张世宝,张淙皎,解伟.大型泄洪排沙闸预应力闸墩结构模型试验研究[J].水力发电学报,2009,28(4):92-96.(ZHANG Shi-bao,ZHANG Cong-jiao,XIE Wei.Study on model test for a large scale pre-stressed pier of a flood releasing and scouring sluice[J].Journal of Hydroelectric Engineering,2009,28(4):92-96.(in Chinese))
[7]陈震,徐远杰.基于弹塑性损伤模型的预应力闸墩非线性有限元分析[J].武汉大学学报:工学版,2012,43(4):481-484.(CHEN Zhen,XU Yuan-jie.Nonlinear finite element analysis of prestressed pier based on elastoplastic damage model[J].Engineering Journal of Wuhan University,2012,43(4):481-484.(in Chinese))
[8]练继建,杨敏,李火坤,等.高坝泄流工程[M].北京:中国水利水电出版社,2008.(LIAN Ji-jian,YANG Min,LI Huokun,et al.Hydrodynamics for high dam[M].Beijing:China WaterPower Press,2008.(in Chinese))
[9]彭刚,陈灯红,姚艳华,等.江坪河预应力闸墩动力响应分析[J].三峡大学学报:自然科学版,2008,30(4):1-4.(PENG Gang,CHEN Deng-hong,YAO Yan-hua,et al.Dynamic response analysis of prestressed pier of Jiangpinghe project[J].Journal of China Three Gorges University(Natural Sciences),2008,30(4):1-4.(in Chinese))
[10]练继建.泄洪闸闸墩泄洪振动研究[R].天津:天津大学水利工程仿真与安全国家重点实验室,2013.(LIAN Ji-jian.A study of flow induced vibration of sluice piers[R].Tianjin:State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,2013.(in Chinese))
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