Experimental Investigation on Tensile Properties of the Bolt in Sphere Joints Under Fire

Abstract

As a common type of joint used in spatial grid structures, the tensile performance of bolt-sphere joints directly affects the safety of the spatial grid structure under fire. To study the tensile properties of the bolts in sphere joints under fire, the four sets of 36 bolt-sphere joints consist of M20, M24, M30, and M36 high-strength bolts were conducted in elevated temperature by steady-state test. Therefore, the tensile bearing capacity of the bolt-sphere joint was obtained under different elevated temperatures. Experimental results show the destroyed section of the bolt-sphere joint that occurs in the thread of the high-strength bolt at the intersection of the sphere because of the maximum concentration of stresses that occurred in areas of destruction. The brittle fracture of bolt-sphere joints happened when the temperature is below 400 ℃. As the temperature increased, the neck shrinkage of the damaged section of the bolt becomes more apparent, and the ductile failure of the bolt-sphere joint occurred. The stiffness and the bearing capacity of bolt-sphere joints decreased gradually as the temperature rose. Conversely, the ductility was gradually increasing. When the temperature was greater than 300 ℃, the stiffness and the bearing capacity of the bolts in sphere joint decreased rapidly. The bearing capacity reduction coefficient of the high-strength bolts with different diameters were next to the same at elevated temperatures. According to the experimental data, the formulas of the tensile bearing capacity reduction coefficient of bolt-sphere joints were obtained.

This is a preview of subscription content, log in to check access.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

References

  1. Fan, X. M. (2013). The displacement and internal force analysis of steel grid structure after fire. Master’s thesis, Beijing: Beijing University of Technology (in Chinese).

  2. Jiao, J. F., Lei, H. G., & Chen, Y. F. (2018). Experimental study on variable-amplitude fatigue of welded cross plate-hollow sphere joints in grid structures. Advances in Materials Science and Engineering,2018, 1–15.

    Google Scholar 

  3. Kirby, B. R. (1995). The behaviour of high-strength grade 8.8 bolts in fire. Journal of Constructional Steel Research,33, 3–38.

    Article  Google Scholar 

  4. Lange, J., & Gonzalez, F. (2012) Behavior of high-strength grade 10.9 bolts under fire conditions. Structural Engineering International, 22(4), 470–475.

    Article  Google Scholar 

  5. Li, F., Zhu, R. J., & Zhang, D. D. (2018). Mechanical behaviour of high strength aluminum alloy bolt-ball joint system under axial load and initial stiffness computational model. Journal of Building Structures,39(S2), 103–111. (in Chinese).

    Google Scholar 

  6. Li, G. Q., Jiang, S. C., Yin, Y. Z., Chen, K., & Li, M. F. (2003). Experimental studies on the properties of constructional steel at elevated temperatures. Journal of Structural Engineering,129(12), 1717–1721.

    Article  Google Scholar 

  7. Liu, X. L., & Chen, Z. H. (1994). Analysis of collapse mechanism of welded hollow sphere joint in space trusses and experimental research of its bearing capacity. Journal of Building Structures,15(3), 38–44. (in Chinese).

    Google Scholar 

  8. Lopez, A., Puente, I., & Aizpurua, H. (2011). Experimental and analytical studies on the rotational stiffness of joints for single-layer structures. Engineering Structures,33, 731–737.

    Article  Google Scholar 

  9. Ma, H. H., Fan, F., Ke, J., & Cao, Z. G. (2010). Experimental research on semi-rigid joints used in grid structures and reticulated domes. Journal of Building Structures,31(11), 65–71. (in Chinese).

    Google Scholar 

  10. Niu, F. M. (2011). The accident analysis and reflection of American New York Word Trade Center Building. Architectural and Structural Design,9, 69–72. (in Chinese).

    Google Scholar 

  11. Pang, X. P., Hu, Y., Tang, S. L., Xiang, Z., et al. (2019). Physical properties of high-strength bolt materials at elevated temperatures. Results in Physics,13, 1–11.

    Article  Google Scholar 

  12. Qu, C. Y., Liu, D. D., & Chen, G. G. (2018). Research on fire resistance ability of the large-space steel truss. Building Structure,48(S2), 534–537. (in Chinese).

    Google Scholar 

  13. Rahnavard, R., Siahpolo, N., Naghavi, M., & Hassanipour, A. (2014). Analytical study of common rigid steel connections under the effect of heat. Advances in Civil Engineering,2014, 1–10.

    Article  Google Scholar 

  14. Rahnavard, R., & Thomas, R. J. (2018). Numerical evaluation of the effects of fire on steel connections; part 1: Simulation techniques. Case Studies in Thermal Engineering,12, 445–453.

    Article  Google Scholar 

  15. Rahnavard, R., & Thomas, R. J. (2019). Numerical evaluation of the effects of fire on steel connections; part 2: Model results. Case Studies in Thermal Engineering,13, 1–9.

    Article  Google Scholar 

  16. Shen, C. W., Chen, S. L., & Gan, S. P. (2002). Repairing construction of lattice grid structure for CCTV Taihu photostudio after fire. Steel Construction,1(17), 44–46. (in Chinese).

    Google Scholar 

  17. Tian, L. M., Wei, J. P., Hao, J. P., & Wang, X. T. (2017). Dynamic analysis method for the progressive collapse of long-span spatial grid structures. Steel and Composite Structures,23(4), 435–444.

    Article  Google Scholar 

  18. Wei, J. P., Tian, L. M., & Hao, J. P. (2018). Improving the progressive collapse resistance of long-span single-layer spatial grid structures. Construction and Building Materials,171, 96–108.

    Article  Google Scholar 

  19. Zhai, C. M. (2014). Research on damage evaluation of steel structures in the high-rise building based on TVCC fire disaster. Master’s thesis. Tianjin: Tianjin University (in Chinese).

Download references

Acknowledgements

The authors would like to acknowledge that this research was supported by the Nanjing Gongda Construction Technology Co. Ltd.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Fang Yang.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Huang, B., Lu, M., Fu, Y. et al. Experimental Investigation on Tensile Properties of the Bolt in Sphere Joints Under Fire. Int J Steel Struct (2020). https://doi.org/10.1007/s13296-020-00368-8

Download citation

Keywords

  • Bolt-sphere joints
  • High temperature
  • Tensile properties
  • Experimental study
  • Predictive equation