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Steel and Composite Structures Volume 41, Number 5, December10 2021 , pages 681-695 DOI: https://doi.org/10.12989/scs.2021.41.5.681 |
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Retrofitted built-up steel angle members for enhancing bearing capacity of latticed towers: Experiment |
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Jian-Tao Wang, Xiao-Hong Wu, Bin Yang and Qing Sun
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| Abstract | ||
| Many existing transmission or communication towers designed several decades ago have undergone nonreversible performance degradation, making it hardly meet the additional requirements from upgrades in wind load design codes and extra services of electricity and communication. Therefore, a new-type non-destructive reinforcement method was proposed to reduce the on-site operation of drilling and welding for improving the quality and efficiency of reinforcement. Six built-up steel angle members were tested under compression to examine the reinforcement performance. Subsequently, the cyclic loading test was conducted on a pair of steel angle tower sub-structures to investigate the reinforcement effect, and a simplified prediction method was finally established for calculating the buckling bearing capacity of those new-type retrofitted built-up steel angles. The results indicates that: no apparent difference exists in the initial stiffness for the built-up specimens compared to the unreinforced steel angles; retrofitting the steel angles by single-bolt clamps can guarantee a relatively reasonable reinforcement effect and is suggested for the reduced additional weight and higher construction efficiency; for the substructure test, the latticed substructure retrofitted by the proposed reinforcement method significantly improves the lateral stiffness, the non-deformability and energy dissipation capacity; moreover, an apparent pinching behavior exists in the hysteretic loops, and there is no obvious yield plateau in the skeleton curves; finally, the accuracy validation result indicates that the proposed theoretical model achieves a reasonable agreement with the test results. Accordingly, this study can provide valuable references for the design and application of the non-destructive upgrading project of steel angle towers. | ||
| Key Words | ||
| built-up steel angle; non-destructive reinforcement; overall bending capacity; reinforcement behavior; substructure tower test | ||
| Address | ||
| Jian-Tao Wang: Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China Department of Civil Engineering, Tsinghua University, Beijing 100084, P.R. China Xiao-Hong Wu: School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, P.R. China Bin Yang and Qing Sun: Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, P.R. China | ||