摘要
基于所建立的输电塔-导线体系空间有限元模型,利用非线性时程分析法研究了体系在多点地震输入下的反应特性。首先依据《电力设施抗震设计规范》,在传统的谐波叠加合成算法的基础上,给出了拟合规范反应谱的输电塔-导线体系多点地震动模拟算法。利用生成的人造地震动研究了行波效应、部分相干效应以及局部场地土效应对体系的影响规律,研究结果表明,在所考虑的行波波速下,行波效应对塔的受力有利,但放大了导线的轴力和位移响应;部分相干效应对于塔的受力、导线的轴力和位移响应均不利;局部场地土条件的差异同样会放大塔和导线的响应,随着各塔场地土条件差异变大,响应被强烈的放大了;在实际分析中,应该综合考虑三个因素对结构地震响应的影响,以保证结构体系的安全。
Based on the model of a power transmission tower-cable system established,the influence of spatially ground motion on the longitudinal seismic response of the system is studied using nonlinear time history analysis.First,an artificial earthquake motion being compatible with the code response spectrum is generated using harmonic wave superimposing method.Structural seismic responses are compared under non-uniform excitation considering wave passage effect,incoherence effect and local site effect.The results indicate that wave passage effect is favorable for the internal forces of the tower,and increases the cable axis forces,longitudinal and vertical displacements of the cables;incoherence effect is unfavorable for both the tower and the cables;the bigger the local site differences among the tower bases,the larger the detrimental effect.Therefore,the three factors should be properly considered in the seismic response analysis in order to guarantee the safety of the tower-cable system.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第10期75-80,共6页
Journal of Vibration and Shock
基金
国家自然科学基金重点项目(50638010)
教育部创新团队发展计划资助项目(IRT0518)
高等学校学科创新引智计划资助项目(B08014)
