對於位處高海拔及開闊地區之塔群結構而言，其附屬輸電纜線常因風力作用而產生可觀之擺動振幅，此使得彼等於強震下之動力分析，務須將常態風載所致生之纜索拉力涵計在內。本文除擬採用空間樑-柱元素來模擬各塔體構件外，並擬採用有效之纜索元素來模擬懸垂於相鄰輸電塔間之高壓電纜，期能徹底瞭解相鄰電塔於不同垂直及水平相對位置下，其各別桿件變形及受力之差異性；又為使分析結果更具可靠性及實用性，精密之土壤-結構互制模式及構件極限破壞指數將予採用。研究結果顯示，於強震作用下，纜索之質量及其橫向風載確將對塔群之動力反應造成明顯之影響。 For the transmission towers located at a high-elevation and open area, the significant vibration amplitude caused by the strong wind force will often be found on the affiliated high-voltage cables. Accordingly, the elaborated seismic analysis undertaken on them should be based on the consideration of the regional wind effects. In his research, 3-D beam elements and efficient cable elements will be used for modeling the tower bodies and transmission lines respectively so as to seize differences of deformed and stressed conditions among structural members for the transmission towers going through various topographies. Furthermore, to enhance the reliability and value in practice for the analytical outcome, an effective spatial soil-structure interaction model and an effective parameter called “failure index” will be utilized in the analyses. It is shown in the results that the dynamic responses of the transmission towers subjected to the heavy earthquake would be affected significantly by either the cable mass or transverse wind drag acting on the cables.
