| In recent years, electric power projects of our country has developed quickly. With regard to electric voltage, its class has risen from 110kv, 220kv to extra high voltage of 330kv, 500kv. Nowadays, our country's electric network line is launching the plan and research work of ultra high voltage of 1000kv. Compared with that of today, weight of one tower in this transmission line will increase about 4-5 times. Then it will call for higher requirement on steel intensity and structural design of electric transmission towers. In order to make buiding cost of towers more economic, steel intensity must be strengthened on a large scale, which includes intensity class of Q390, Q420, Q460.Based on a southern electric transmission line of ultra high voltage of 800kv designed by our working group, the total weight of towers choosing Q345 is compared with that choosing Q390, Q420, Q460 respectively by computing several towers in this project so as to indicate economic and optimizing value of high-intensity steel.As equilateral angle of Q460 is what we want to study best, axially compressed stability of angle of Q460 is analyzed with Ansys, which is a well-developed finite element analysis software, to work out its ultimate strength under different boundary conditions. After analyzing and processing the results computed with the software, these results are compared with those in current PRC codes and the curve of λ-φ is painted, thus putting forward design method and parameters in line with our code to direct practical projects.According to the research above, local buckling of axially compressed angle is discussed. Comparing the design method of every code in local buckling , some basic conclusions are obtained to make application of extra high-intensity steel to electric transmission towers come true. |
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