高压输电线铁塔地震时程弹性数值模拟
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摘要
地震对高压输电线铁塔的安全性能有重要影响。通过建立高压输电线铁塔模型,采用有限元方法对受7级和8级地震影响的高压输电线铁塔的力学行为进行数值模拟与分析。计算结果表明:在地震作用下高压输电线铁塔t=3-4s时加速度最大,其应力也相应较大;在7级地震时最大应力值远小于材料的许可应力,高压输电线铁塔在7级地震过程中是安全的,但是8级地震时,最大应力值已经达到234MPa,超过Q345许可应力230MPa,高压线铁塔就处于不安全运行状态。
The safety performance of high-voltage transmission tower can be affected obviously by earthquake.With finite element method,the model of high-voltage transmission tower was established to study its strength and safety,which was affected by 7 magnitude earthquake and 8 magnitude earthquake.The numerical simulation results showed that the acceleration of high-voltage transmission tower is biggest at 3s-4s with earthquake,and at the same time the stress of tower is larger,with 8 magnitude earthquake the maximum stress value is much smaller than the material allowable stress,high-voltage transmission tower is safe.But with 7 magnitude earthquake the maximum stress value 234MPa is bigger than the allowable stress 230MPa of Q345,which may cause the high-voltage transmission tower in the state of unsafe operation.
The safety performance of high-voltage transmission tower can be affected obviously by earthquake.With finite element method,the model of high-voltage transmission tower was established to study its strength and safety,which was affected by 7 magnitude earthquake and 8 magnitude earthquake.The numerical simulation results showed that the acceleration of high-voltage transmission tower is biggest at 3s-4s with earthquake,and at the same time the stress of tower is larger,with 8 magnitude earthquake the maximum stress value is much smaller than the material allowable stress,high-voltage transmission tower is safe.But with 7 magnitude earthquake the maximum stress value 234MPa is bigger than the allowable stress 230MPa of Q345,which may cause the high-voltage transmission tower in the state of unsafe operation.
引文
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[3]尹荣华,李东亮,等.高压输电塔震害及抗震研究[J].世界地震工程,2005,3(1):51-54YIN Rong-hua,LI Dong-liang,LIU Ge-lin,ZHAI Tong.Seismic damage and analysis of power transmissions[J].TowersWorld Earthquake Engineering,2005,3(1):51-54
[4]魏奇科,李正良.行波效应对大跨越输电塔-线体系纵向地震响应影响[J].振动与冲击,2011,30(10):236-240WEI Qi-ke,LI Zheng-liang.Traveling wave effect on lon-gitudinal seismic response of a long-span power transmis-sion tower-cable system[J].Journal of Vibration andShock,2011,30(10):236-240
[5]胡大柱,李宏男,贾连光,等.地震作用下输电铁塔非线性动力反应分析[J].沈阳建筑工程学院学报(自然科学版),2004,20(2):94-96HUI Da-zhu,LI Hong-nan,JIA Lian-guang,LI Xiao-li.Nonlinear dynamic analysis on the transm ission towersubjected to earthquake action[J].Journal of ShenyangArchitectural and Civil Engineering University(NatureScience),2004,20(2):94-96
[6]尹鹏,李黎,胡亮霞,等.大跨越输电塔的地震响应研究[J].电力建设,2008,29(12):13-17YIN Peng,LI Li,HU Liang-xia,LIANG Feng.Study onseismic responses of large crossing span transmission tow-ers[J].Electric Power Construction,2008,29(12):13-17
[7]贾玉琢,贤鹏,李曰兵.基于时程分析法分析500kV长短腿猫头直线塔的地震反应[J].四川建筑科学研究,2011,37(1):141-145JIA Yu-zuo,XIAN Peng,LI Yue-bing.Estimating seismicresponses of 500 kV transmission towers with unequal legsby time-history method[J].Building Science Research ofSichuan,2011,37(1):141-145
[8]陈建稳,袁广林,刘涛,等.数值模型对输电铁塔内力和变形的影响分析[J].山东科技大学学报(自然科学版),2009,19(6):40-45CHEN Jian-wen,YUAN Guang-lin,LIU Tao,WANG Xin.The influence analysis of numerical model on internalforce and structural deformation of power transmissiontower[J].Journal of Shandong University of Science andTechnology(Natural Science),2009,19(6):40-45
[9]Loh Chinhsiung and Ku Baoding.An effieient analysis ofstructureal response for multiple-support seismic excita-tions[J].Engng.Struct.1995,17(l):15-26
[10]Kiureghian A D and Nakamura Y.CQC modal combina-tion rule for high-frequency model[J].EESD,1993,22:943-956
[11]邓军,唐家祥.时程分析法输入地震波记录的选择与实例[J].工业建筑,2000,30(8):9-12DENG Jun,TANG Jia-xiang.Choice and measurementof seismic records for time-history analysis[J].Industri-al Construction,2000,30(8):9-12
[12]郝文化,叶裕明,等.ANSYS土木工程应用实例[M].北京:中国水利水电出版社,2005
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