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（1 武漢理工大學(xué)土木工程與建筑學(xué)院， 武漢 430070； 2 國(guó)網(wǎng)山東省電力公司， 濟(jì)南 250000）

［摘要］強(qiáng)震下輸電線路塔-線耦聯(lián)效應(yīng)和方向效應(yīng)，為大跨輸電線路的地震響應(yīng)機(jī)理及抗震性能研究的關(guān)鍵。以某9度地震烈度區(qū)一典型耐張段塔-線體系為分析對(duì)象，采用非線性時(shí)程分析法，考察了單向地震作用下塔-線體系的地震效應(yīng)系數(shù)及耦聯(lián)效應(yīng)系數(shù)。結(jié)果表明：縱向和豎向地震作用下，地震效應(yīng)及導(dǎo)線的耦聯(lián)效應(yīng)顯著，尤其對(duì)于耐張塔和直線桿塔的瓶口部位，設(shè)計(jì)中應(yīng)予以重視。另外，通過將塔-線體系在單向地震作用下與三向地震共同作用下的動(dòng)力響應(yīng)進(jìn)行比較，考察了塔-線體系在多向地震作用下的方向耦合機(jī)制。研究表明，多向地震作用下，塔-線體系的桿件應(yīng)力在三向振型之間存在一定的耦合效應(yīng)，采用CQC法具備一定的精度。

［關(guān)鍵詞］輸電塔-線體系； 地震作用； 非線性時(shí)程分析法； 耦聯(lián)效應(yīng)； 耦合效應(yīng)

中圖分類號(hào)：TU973-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)13-0057-06

Study on coupling mechanism and directional coupling effect between transmission tower and line under strong earthquake

Yuan Zhefeng1, Wang Dahai1, Xu Mingnan1, Sun Qigang2

(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2 State Grid Shandong Electric Power Company, Jinan 250000, China)

Abstract:The coupling effects and directional effects of transmission tower and  line system are the focus of the studies on seismic response mechanism and seismic performance of transmission tower and  lines under strong earthquake. Based on a typical strain section of transmission tower and line system in 9 degree seismic intensity region, the coefficient of seismic effect and the coupling effect  were investigated by the nonlinear time-history analysis under one-dimensional earthquake action. The results show that the seismic effect and coupling mechanism of conductors are remarkable under the longitudinal and vertical earthquakes, especially for the bottle mouth of typical strain tower and straight line tower, which should be paid attention to in the design. Furthermore, by comparing the dynamic responses of the transmission tower and  line system under one-dimensional earthquake and three-dimensional earthquakes, the directional coupling effect of the system was studied under multiple-dimensional earthquake. The study shows that there is certain coupling effect between the three vibration modes for members′ stresses of the system, which can be calculated by the complete quadratic combination method (CQC) with certain precision.

Keywords:transmission tower and  line system; earthquake action; nonlinear time-history analysis method; coupling mechanism; coupling effect 

*國(guó)家自然科學(xué)基金（51478373;51578434）。

通訊作者：汪大海，博士，副教授，博士生導(dǎo)師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，mail:wangdahai@whut.edu.cn。