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Experimental and Numerical Study on the Nonlinear Behavior of Strengthened Beams Under High Preload

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Abstract

The behavior of the H-beam strengthened with welded T-beam is tested and simulated to investigate the nonlinear behavior of flexural members strengthened under high preload. Experimental result reveals that for the four specimens that fails predominantly by flexural yielding, the increase in the preload results in a reduction in both the yield load and the ultimate load when the preload ratio exceeds 0.75. In the parametric numerical analysis, the effect of heat input is considered by means of indirect thermal-structural coupling analysis. At each preload ratio, the influence of the aspect ratio, which is defined as the ratio between section height and width, is studied. Results show that as the aspect ratio decreases, the discrepancy between the ultimate load of preloaded and unpreloaded beams increases. An empirical formula is proposed to calculate the reduction of ultimate load for beams affected from different preload ratios considering various aspect ratios. Further studies are conducted on the welding safety. It is demonstrated that beam with the section larger than WH100 × 100 × 10 × 10 may be welded under high load safely when the preload ratio is < 0.97. What’s more, the approaches to calculate residual deflection and increments of deflection during welding process are proposed and verified to be effective. Finally, the proposed theoretical method to calculate design bearing capacity of reinforced beams may be utilized to increase the accuracy of design process.

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The data sets supporting the results of this article are included within the manuscript.

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Funding

This study was funded by the National Natural Science Foundation of China (Grant No. 51878443) and Hebei Province Full-time Top-level Talents Introduction Project (Grant No. 2020HBQZYC013).

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China

    Hongbo Liu & Zhihua Chen

  2. Department of Civil Engineering, Hebei University of Engineering, Handan, 056000, China

    Hongbo Liu

  3. Key Laboratory of Coast Civil Structure and Safety, Ministry of Education, Tianjin University, Tianjin, 300072, China

    Hongbo Liu & Zhihua Chen

  4. Department of Civil Engineering, Tianjin University, Tianjin, 300072, China

    Jingxian Zhao, Hongbo Liu, Zhihua Chen & Shishuo Zhang

Authors
  1. Jingxian Zhao
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  2. Hongbo Liu
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  3. Zhihua Chen
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  4. Shishuo Zhang
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Contributions

The idea and methodology for this paper was proposed by Hongbo Liu. The experimentation, data analysis, finite element analysis and theoretical derivation were performed by Jingxian Zhao. The task of supervision and review are fulfilled by Zhihua Chen. The figures were plotted by Shishuo Zhang. All authors commented on previous versions of the manuscript. The revised draft of the manuscript was written by Jingxian Zhao under the direction of Hongbo Liu. All authors read and approved the final manuscript.

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Correspondence to Hongbo Liu.

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Zhao, J., Liu, H., Chen, Z. et al. Experimental and Numerical Study on the Nonlinear Behavior of Strengthened Beams Under High Preload. Int J Steel Struct 21, 1564–1587 (2021). https://doi.org/10.1007/s13296-021-00521-x

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  • DOI: https://doi.org/10.1007/s13296-021-00521-x

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