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  

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

作　　者：张庆 付兴 江文强[1] ZHANG Qing;FU Xing;JIANG Wenqiang(Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention,North China Electric Power University,Baoding 071003,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)

机构地区：[1]华北电力大学河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003 [2]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116023

出　　处：《振动与冲击》2024年第22期96-105,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(52078104);河北省三三三人才工程(C20231056)。

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,通过加速度、应变等响应重构风荷载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。该研究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高的足尺塔试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。Lattice towers are widely used in infrastructures.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 one of the ways to solve this problem is to reconstruct wind load indirectly through easily measured responses.The classical wind load identification method does not consider the influence of rotation,leading to the inaccurate identification results.A wind load identification method considering the influence of rotational degrees of freedom was proposed on the premise of knowing monitoring data.The dynamic displacement and modal information of the lattice tower were reconstructed from the strain response,and then the Kalman filter algorithm was utilized to calculate the velocity response and modal wind load.The mass matrix considering the influence of rotational degrees of freedom was established,and on this basis,the wind load of the structure was identified.The numerical simulation of the lattice tower verifies that the wind load reconstructed by the method is highly consistent with the theoretical result 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%.A 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 

分 类 号：TU311.3[建筑科学—结构工程] TU391