Under long term wind load, the bolt looseness occurring at the joints of tower legs will reduce the wind-resistant capability, increasing the wind-induced displacement responses and affecting the serviceability of the high-rise steel tower. In order to detect the bolt looseness locations of the flange assembling joints of leg members in high-rise steel tubular tower structures, a new bolt loosening localization at flange joints method using wind-induced response for high-rise tower was presented in this paper. Wind-induced vertical strain response root variance of flange assembling joint on the tower vertical bar is defined as the identification parameter of the bolt looseness damage. Then, the normalized wind-induced vertical strain response root variance is defined as the damage index of bolt loose-ness damage, thereby eliminating the impact of wind loads of different magnitudes on damage identification. When the damage index exceeds the threshold, it can be considered that the bolt looseness damage occurs in flange assembling joint, thereby to realize the damage identification. The results both numerical analyses of a practical transmission tower and scaled model wind tunnel experiment of a steel tubular tower show that the proposed method is efficient and noise immunity on the bolt looseness location detection for high-rise tower.

在长期风荷载作用下，塔腿连接处螺栓松动会降低抗风能力，增加风致位移响应，影响高层钢塔的使用性能。为检测高层钢管塔结构支腿构件法兰连接处螺栓松动位置，提出了一种利用风致响应的高层塔体法兰连接处螺栓松脱定位方法。将塔立杆法兰装配接头风致竖向应变响应根方差定义为螺栓松动损伤的识别参数。然后，将归一化的风致垂直应变响应根方差定义为螺栓松动损伤的损伤指数，从而消除不同大小的风荷载对损伤识别的影响。当损伤指标超过阈值时，可认为法兰装配接头发生螺栓松动损伤，从而实现损伤识别。实际输电塔的数值分析和钢管塔的比例模型风洞试验结果表明，该方法对高层塔螺栓松动位置检测具有高效性和抗噪性。