| The construction of the transmission line system is a very important part of the electric power construction and it has been widely used in power construction. Transmission tower is very highly and has high flexibility. Transmission towers once are destroyed in the earthquake and it will bring great difficulties to the earthquake disaster relief and emergency measures. Reasonable design of transmission line system and its layout directly determines the appropriateness of the economic rationality of the transmission line. So the study of the seismic performance of the transmission line system has a very theoretical and practical significance.SAP2000finite element software creates three leg length transmission tower model and proceeds modal analysis. It analyzes comparatively their characteristics of cycle. Seismic performance evaluation of the three transmission towers is made by SAP2000. I input three waves in SAP2000.Dynamic time history analysis method analyzes the displacement of the control point, the vertex maximum speed and acceleration of the vertex, the maximum axial force of the lever member, the maximum base shear. Evaluation of the seismic performance of the three transmission towers is made.SAP2000finite element software creates three different number of beams transmission tower model and proceeds modal analysis. It analyzes comparatively their characteristics of cycle. Seismic performance evaluation of the three transmission towers is made by SAP2000. I input three waves in SAP2000.Dynamic time history analysis method analyzes the displacement of the control point, the vertex maximum speed and acceleration of the vertex, the maximum axial force of the lever member, the maximum base shear. Evaluation of the seismic performance of the three transmission towers is made.From the length of the legs come in three models transmission tower model analysis has a result:short legs become shorter and the overall stiffness of the structure Increases. Absorb of Seismic energy is growing strongly. The cycle of the structure becomes smaller. The leg length tower under seismic action has small displacement of the control point, vertex velocity, acceleration, but the mast axis force and base shear become bigger at short-legged. Structural design should choose reasonably the form of the tower enhancing the seismic performance. Different number of beams transmission tower model analysis has a result:the number of beams of the transmission towers increases and overall stiffness become bigger. Absorb of Seismic energy is growing strongly. The cycle of the structure becomes smaller. The leg length tower under seismic action has small displacement of the control point, vertex velocity, acceleration, but the mast axis force and base shear become bigger at short-legged. The increase in the number of beams does not necessarily improve the seismic performance of the structure. Therefore, the transmission tower structure should be designed under earthquake and we arrange rationally the number of beams, thereby enhancing the seismic performance. |
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