Safety assessment method for in-service steel towers

Abstract

The invention relates to a safety evaluation method of an in-service iron tower. The safety evaluation method comprises the following steps: (1) laboratory data simulation is carried out on a power transmission pylon, a tangent tower is selected during the data simulation, and the main material and the diagonal member of the pylon are both simulated by a BEAM188 unit in an ANSYS cell library; (2) the above simulated power transmission pylon is subjected to statics analysis in five wind directions to find the dangerous position of the iron tower in each wind direction; (3) in order to carry out iron tower abrasion degree comparison, the part, which has a smallest tower material abrasion degree, of the in-service iron tower is measured; (4) the dangerous position, which is determined in the (2), of the iron tower is measured; and (5) the relative abrasion rate of the iron tower is calculated, and a safety evaluation result is given. The mathematic reckoning method of the invention is correct, practical operation steps are simple, a tower body is not damaged, an evaluation result is accurate and reliable, and a good judgment basis is provided for evaluating the safety of the power transmission iron tower.

Description

technical field [0001] The invention belongs to the technical field of power transmission and transformation, in particular to a safety evaluation method for in-service iron towers. Background technique [0002] The safety and stability of the transmission tower is related to the normal operation of the transmission line. The tower is under a variety of complex force states such as line tension and compression stress, wind load, vibration load, and alternating load for a long time. The safety performance of the tower is prone to collapse. towers, broken lines and other serious transmission line accidents. Therefore, timely and correct evaluation of the safety performance of the iron tower has important engineering practical significance. [0003] The conventional safety evaluation methods of iron towers are visual inspection, size and position measurement, surface non-destructive testing, etc. of the stress concentration parts of the tower materials. The limitations of the ...

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Problems solved by technology

[0003] Conventional tower safety evaluation methods are visual inspection, size and position measurement, surface non-destructive testing, etc. on the stress concentration parts of the tower materials. The limitations of the testing methods often lead to inaccurate evaluation results and low reliability.

The laboratory evaluation results of the tower material are accurate and reliable, but the tower material needs to be cut, which damages the tower body

At present, there is no safety performance evaluation method for in-service iron towers with reliable data and no damage to tower materials

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