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研究了某大型钢管输电塔的非线性地震反应问题。首先,建立了钢管输电杆塔的有限元模型,建立了输电杆塔在地震激励作用下的运动方程和非线性地震反应计算方法。以某实际输电杆塔为工程背景,研究了输电杆塔的线性和非线性地震反应特点和规律,并进一步地对比了线性地震反应和非线性地震反应的差异。结果表明,输电杆塔由多根杆件所组成,在强烈地震作用下结构不同位置表现出了不同的地震反应特点。地震激励沿出平面方向作用的结构反应略大于沿在平面方向作用的地震反应,杆塔结构上部表现出了一定程度的鞭梢效应。考虑几何非线性效应的分析结果比线弹性地震反应的结果略大,考虑双重非线性效应的结果则比只考虑材料非线性效应的结果略大。
The nonlinear seismic response of a large steel tube transmission tower is studied. First of all, the finite element model of the transmission pole of steel pipe was established, and the equations of motion of the transmission tower under earthquake excitation and the calculation method of nonlinear seismic response were established. Taking an actual transmission tower as an engineering background, the characteristics and regularities of linear and nonlinear seismic responses of transmission towers are studied, and the differences between linear and non-linear seismic responses are further contrasted. The results show that the power transmission tower is composed of multiple rods, and different seismic responses show different locations under strong earthquake. The structural response of the seismic excitation acting in the out-of-plane direction is slightly larger than that in the plane direction. The upper part of the tower structure shows a certain whiplash effect. The results of considering the geometric nonlinearity effect are slightly larger than those of the linear elastic seismic response. The results considering the double nonlinear effect are slightly larger than those considering only the material nonlinear effect.