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Failure analysis of transmission tower subjected to strong wind load
Abstract Based on field investigation of a damaged transmission line following Typhoon Mujigae in 2015, a failure analysis is performed to estimate the load-bearing capacity of a transmission tower. Static nonlinear buckling analysis and dynamic analysis are employed to assess the ultimate load capacity and the most vulnerable parts of the tower. In the dynamic analysis, a tower-line (TL) coupled model is established which accounts for members buckling capacity. The two methodologies predicted close wind load capacity (34.8 m/s in static analysis and 34 m/s in dynamic analysis), while the failure modes and buckled members are different. While static analysis shows that the leg members buckled, dynamic analysis reveals that it is the diagonal members that buckle. Reasons are explained in this paper and suggestions are given that the dynamic analysis should be adopted in integrally evaluating a transmission tower, especially when locating the buckled member. More, emphasis should be given to the design of diagonal members.
Highlights A field investigation on tower collapses caused by strong Typhoon “Mujigae” was carried out. Static nonlinear buckling analysis and dynamic analysis are adopted to assess the load-bearing capacity of tower. Two methods predicted different fragile members. Suggestions are given that dynamic analysis should be employed when evaluating a tower performance integrally.
Failure analysis of transmission tower subjected to strong wind load
Abstract Based on field investigation of a damaged transmission line following Typhoon Mujigae in 2015, a failure analysis is performed to estimate the load-bearing capacity of a transmission tower. Static nonlinear buckling analysis and dynamic analysis are employed to assess the ultimate load capacity and the most vulnerable parts of the tower. In the dynamic analysis, a tower-line (TL) coupled model is established which accounts for members buckling capacity. The two methodologies predicted close wind load capacity (34.8 m/s in static analysis and 34 m/s in dynamic analysis), while the failure modes and buckled members are different. While static analysis shows that the leg members buckled, dynamic analysis reveals that it is the diagonal members that buckle. Reasons are explained in this paper and suggestions are given that the dynamic analysis should be adopted in integrally evaluating a transmission tower, especially when locating the buckled member. More, emphasis should be given to the design of diagonal members.
Highlights A field investigation on tower collapses caused by strong Typhoon “Mujigae” was carried out. Static nonlinear buckling analysis and dynamic analysis are adopted to assess the load-bearing capacity of tower. Two methods predicted different fragile members. Suggestions are given that dynamic analysis should be employed when evaluating a tower performance integrally.
Failure analysis of transmission tower subjected to strong wind load
Zhang, Jian (author) / Xie, Qiang (author)
Journal of Constructional Steel Research ; 160 ; 271-279
2019-05-30
9 pages
Article (Journal)
Electronic Resource
English
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