Power transmission tower structure wind-induced safety evaluation method based on wind speed and dynamic response tests

Abstract

The invention discloses a power transmission tower structure wind-induced safety assessment method based on wind speed and dynamic response test. The method comprises the following steps: actually measuring wind field information and structure power wind-induced response of an in-service power transmission tower; generating a real wind load time history acting on the tower body of the power transmission tower; obtaining a high-fidelity finite element model containing structural damage; applying a real dynamic wind load to the high-fidelity finite element model containing the damage, and obtaining real full-field stress distribution of the whole structure at each moment by using a time-history analysis method; and calculating the wind-induced dynamic reliability of the structure by utilizing the full-field stress distribution of the structure obtained by numerical calculation and adopting a Ditlevsen narrow-boundary theory, and evaluating the safety of the power transmission tower structure in a strong wind environment in real time. The authenticity of numerical analysis is guaranteed through field measured data, full-field stress distribution of the power transmission tower is obtained through numerical calculation, the wind-induced power reliability of the whole structure is further evaluated, and the wind-induced failure probability of the in-service power transmission towerstructure can be given in real time.

Description

technical field [0001] The invention relates to a safety assessment method for a transmission tower structure, in particular to a wind-induced safety assessment method for a transmission tower structure based on wind speed and dynamic response tests. Background technique [0002] The transmission tower line system is the carrier of power transmission and the top priority of the lifeline project. The transmission tower is the main component of the tower line system, generally a steel truss tower, a tall and flexible structure, which is extremely sensitive to wind loads. According to statistics, wind load is the most important cause of damage or even collapse of transmission towers, and wind damage accidents of transmission towers have occurred all over the country. These accidents caused serious economic loss sequence. In order to ensure the safety of transmission towers under strong winds, engineers have installed structural health monitoring systems on some transmission t...

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Problems solved by technology

However, the current structural health monitoring system usually only installs strain sensors on a small number of members, and cannot directly obtain the full-field stress state of the real structure

Through finite element analysis, engineers can grasp the full-field stress distribution of the structure. However, the numerical model used in the calculation is usually established based on the ideal design state and cannot represent the real physical object; in addition, the external load used is usually determined by the atmospheric boundary layer wind. These theoretical empirical formulas are all based on the simplification and conservative induction of real physical phenomena. Therefore, the external loads used in numerical calculations are also far from the real wind loads. Far

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