Power transmission tower structure full-life multi-disaster resistance evaluation method considering wind-induced fatigue effect

Abstract

The invention discloses a power transmission tower structure full-life multi-disaster resistance evaluation method considering a wind-induced fatigue effect, and the method comprises the steps: building a power transmission tower structure model, and selecting and simulating a seismic wave and coherent wind load time history suitable for the structure; actually measured wind speed and wind direction data of the structure are collected, and the occurrence probability and annual duration of different wind speeds and wind directions are calculated; simulating and generating wind load time histories of different wind speeds and wind directions according to the actually measured data, and loading the power transmission tower structure to obtain a structure stress response time history; the stress cycle of the structural rod piece under the wind load effect is counted, and fatigue accumulated damage of the structural rod piece in unit time is calculated; according to the fatigue accumulated damage of the structural rod piece and the material fatigue performance time-varying model, material parameters of the structural rod piece in different life cycles are updated, and time-varying finite element models of different life stages considering wind-induced fatigue performance degradation are established; and performing multi-disaster resistance evaluation on the model in the whole life cycle, and verifying the influence of the wind-induced fatigue effect on the multi-disaster resistance of the structure in different life stages.

Description

technical field [0001] The invention belongs to the technical field of safety evaluation of transmission tower structures in the discipline of civil engineering, and in particular relates to a method for evaluating the anti-multiple-disaster performance of transmission tower structures throughout their lifespans based on measured data and considering wind-induced fatigue effects. Background technique [0002] The transmission tower structure is an important infrastructure of a country, which undertakes the task of power transmission and distribution, and greatly promotes the development of the national economy. my country is a country with frequent natural disasters such as earthquakes and winds. Therefore, the transmission tower structure will inevitably be attacked by various disasters such as earthquakes and strong winds during its entire life cycle, and even occur under the coupling of earthquakes and strong winds. Devastating damage. The damage to the transmission tower...

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Problems solved by technology

[0004] Up to now, many scholars at home and abroad have studied the performance evaluation of transmission tower structures, but there are relatively few related studies on the consideration of wind-induced fatigue effects.

In addition, in the existing structural wind-induced fatigue research, the wind load lacks the support of measured data, and in the numerical calculation of the structural response, no matter whether the wind load is applied to the structure in the form of nodal force or the flow field is simulated by CFD seldom consider the influence of wind direction

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