求解半无限平面动力问题的边界元与有限元耦合模型

SEISMIC RESPONSE ANALYSIS METHOD FOR COUPLED SYSTEM OF TRANSMISSION LINES AND TOWERSPART Ⅱ:IN -PLANE

在地震作用下，由输电塔和导线组成的耦联体系的精确分析是非常复杂的，工程中需要一种合理的抗震计算简图。文献［１］和［２］提出了该种耦联体系的简化抗震计算方法。本文进一步发展了这种方法，建立该种耦联体系在纵向地震作用下更一般的力学模型，导出了相应的运动方程和求解方法。最后，给出了数值算例。结果表明，导线对输电塔地震反应的影响是重要的。

Accurate analysis of the coupled system consisting of the transmission lines and their supporting towers subjected to earthquake excitations is very complicated because the system is three-dimensional and the conductor is largely nonlinear. So, a suitably simplified method for the aseismic analysis of the system will be attractive, The simplified method for the coupled system under the earthqauke was presented by References 1 and 2. In this paper,such analySis method is developed and the more generalized mechanical model for the in- plane seismic analysis of the coupled system is established. The corresponding equation of motion for the system under the elastic and gravitational restoring forces and earthquake is derived and the approach to solve the relevant problem is given. Finally, a numerical example for the coupled system subjected to several seismic inputs is computed in the longitudinal direction of the transmission lines. The results show that the effects of conductors on the seismic responses of the tower are important.