考虑转动自由度影响的格构式塔架风致响应及风荷载识别研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (22) : 96-105.

论文

考虑转动自由度影响的格构式塔架风致响应及风荷载识别研究

张庆1，付兴*2，江文强1

作者信息 +

Wind-induced response and wind load identification of lattice towers considering the influence of rotational degrees of freedom

ZHANG Qing1，FU Xing*2，JIANG Wenqiang1

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摘要

格构式塔架在基础设施中有着广泛应用，风荷载及风致响应的获取对评估格构式塔架的健康状态具有重要意义，但风荷载难以直接测量，通过容易测量的响应间接重构他们成为解决该问题的途径之一。经典的风荷载识别方法没有考虑转动的影响，导致识别结果不准确。本文在监测数据已知的前提下，提出了一种考虑转动自由度影响的风荷载识别方法，首先由应变响应重构出动态位移和模态信息，然后使用卡尔曼滤波算法计算出速度响应和模态风荷载，最后建立包含转动自由度影响的质量矩阵，并识别出结构所受风荷载。格构式塔架数值模拟证明，该方法重构的风荷载在时域和频域均和理论值高度符合，最高测点处均值和均方根误差不超过7%。54.5 m高的足尺塔实验进一步表明，所提方法用于实际结构的重构误差一般在10%以内。

Abstract

Lattice towers are widely used in infrastructure, the acquisition of wind load and wind-induced responses is of great significance for evaluating the health status of lattice towers. However, wind load is difficult to measure directly, and it is one of the ways to solve this problem to reconstruct them indirectly through easily measured responses. The classical wind load identification method does not consider the influence of rotation, leading to the inaccurate identification results. In this paper, a wind load identification method considering the influence of rotational degrees of freedom is proposed on the premise of known monitoring data. Firstly, the dynamic displacement and modal information are reconstructed from the strain response, and then the Kalman filter algorithm is utilized to calculate the velocity response and modal wind load. Finally, the mass matrix including the influence of rotational degrees of freedom is established, and the wind load of the structure is identified. The numerical simulation of lattice tower verifies that the wind load reconstructed by this method is highly consistent with the theoretical value in both time domain and frequency domain, and the mean value and root mean square error at the highest measuring point are not more than 7%. The 54.5 m-high full-scale tower experiment further shows that the reconstruction error of the proposed method for the actual structure is generally within 10%.

关键词

格构式塔架 / 风荷载 / 简化力学模型 / 卡尔曼滤波 / 足尺试验

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张庆1, 付兴2, 江文强1. 考虑转动自由度影响的格构式塔架风致响应及风荷载识别研究[J]. 振动与冲击, 2024, 43(22): 96-105

ZHANG Qing1, FU Xing2, JIANG Wenqiang1. Wind-induced response and wind load identification of lattice towers considering the influence of rotational degrees of freedom[J]. Journal of Vibration and Shock, 2024, 43(22): 96-105

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