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Experimental study on failure modes and retrofitting method of latticed transmission tower
Highlights Failure mechanism and retrofitting method of a latticed transmission tower were studied by conducting an experimental test on a pair of two-panel subassemblages. The stiffness of diagonal member can be enlarged by retrofitting system, and the retrofitting system also changed the failure mode of the tower. A retrofitting technique is proposed on the diagonal member. The ultimate lateral and vertical load of retrofitted substructure increased significantly, and the most vulnerable member was no longer the diagonal bracing but the leg member.
Abstract Recent years have witnessed an increasing number of transmission towers collapsing under strong winds. Therefore, a retrofitting technique on diagonal bracings is proposed in this paper to enhance the load-carrying capacity of existing transmission towers based on a thorough exploration of the failure mechanism of transmission towers in working conditions. A pair of double-panel subassemblages of a transmission tower with one’s diagonal members retrofitted and the other not were statically tested to study the failure modes and to evaluate the retrofitting effects. The experimental results reveal that in the original tower subassemblages the diagonal members are vulnerable to buckling, which could lead to structural failure, while in the retrofitted specimen the most vulnerable member is the leg member rather than the diagonal bracings, which is accompanied by a change of the failure mode of the subassemblage. The ultimate lateral and vertical loads applied on the retrofitted subassemblage increase significantly compared with the original subassemblage.
Experimental study on failure modes and retrofitting method of latticed transmission tower
Highlights Failure mechanism and retrofitting method of a latticed transmission tower were studied by conducting an experimental test on a pair of two-panel subassemblages. The stiffness of diagonal member can be enlarged by retrofitting system, and the retrofitting system also changed the failure mode of the tower. A retrofitting technique is proposed on the diagonal member. The ultimate lateral and vertical load of retrofitted substructure increased significantly, and the most vulnerable member was no longer the diagonal bracing but the leg member.
Abstract Recent years have witnessed an increasing number of transmission towers collapsing under strong winds. Therefore, a retrofitting technique on diagonal bracings is proposed in this paper to enhance the load-carrying capacity of existing transmission towers based on a thorough exploration of the failure mechanism of transmission towers in working conditions. A pair of double-panel subassemblages of a transmission tower with one’s diagonal members retrofitted and the other not were statically tested to study the failure modes and to evaluate the retrofitting effects. The experimental results reveal that in the original tower subassemblages the diagonal members are vulnerable to buckling, which could lead to structural failure, while in the retrofitted specimen the most vulnerable member is the leg member rather than the diagonal bracings, which is accompanied by a change of the failure mode of the subassemblage. The ultimate lateral and vertical loads applied on the retrofitted subassemblage increase significantly compared with the original subassemblage.
Experimental study on failure modes and retrofitting method of latticed transmission tower
Xie, Qiang (author) / Zhang, Jian (author)
Engineering Structures ; 226
2020-09-22
Article (Journal)
Electronic Resource
English
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