Structural Engineering and Mechanics

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Load-carrying capacities and failure modes of scaffold-shoring systems, Part I: Modeling and experiments

  • Huang, Y.L. (Department of Civil Engineering, Chung-Hsing University) ;
  • Chen, H.J. (Department of Civil Engineering, Chung-Hsing University) ;
  • Rosowsky, D.V. (Department of Civil Engineering, Clemson University) ;
  • Kao, Y.G. (Department of Civil Engineering, Chung-Hsing University)
  • Published : 2000.07.25
⟨ Previous Next ⟩

Abstract

This paper proposes a simple numerical model for use in a finite analysis (FEA) of scaffold-shoring systems. The structural model consists of a single set of multiple-story scaffolds with constraints in the out-of-plane direction at every connection joint between stories. Although this model has only two dimensions (termed the 2-D model), it is derived from the analysis of a complete scaffold-shoring system and represents the structural behavior of a complete three-dimensional system. Experimental testing of scaffolds up to three stories in height conducted in the laboratory, along with an outdoor test of a five-story scaffold system, were used to validate the 2-D model. Both failure modes and critical loads were compared. In the comparison of failure modes, the computational results agree very well with the test results. However, in the comparison of critical loads, computational results were consistently somewhat greater than test results. The decreasing trends of critical loads with number of stories in both the test and simulation results were similar. After investigations to explain the differences between the computationally and experimentally determined critical loads, it was recommended that the 2-D model be used as the numerical model in subsequent analysis. In addition, the computational critical loads were calibrated and revised in accordance with the experimental critical loads, and the revised critical loads were then used as load-carrying capacities for scaffold-shoring systems for any number of stories. Finally, a simple procedure is suggested for determining load-carrying capacities of scaffold-shoring systems of heights other than those considered in this study.

Keywords

References

  1. Ayyub, B.M. and Eldukair, Z.A. (1989), "Impact of errors on safety during construction", Proceedings of the Sessions Related to Design, Analysis and Testing, ASCE Structures Congress, San Francisco, May.
  2. Jan, T.S. (1987), "General instability of scaffold", Proceedings of International Conference on Structural Failure, Singapore.
  3. Kao, C.C. (1981), "Analysis of safety behavior for steel scaffold and vertical shore", Report, Department of Civil Engineering, National Taiwan University, Taiwan.
  4. Matousek, M. and Schneider (1977), "Untersuchungen zur struktur des seicherheits problems bei bauwerken", Report No. 59, Institute of Structural Engineering, Swiss Federal Institute of Technology, Zurich.
  5. Peng, J.L., Pan, A.D., Rosowsky, D.V., Chen, W.F., Yen, T. and Chan, S.L. (1996), "High clearance scaffold systems during construction, I: Structural modeling and modes of failure", Engineering Structures, 18(3), 247-257. https://doi.org/10.1016/0141-0296(95)00144-1
  6. Yen, T., Chen, W.F, Lin, C.H., Go, C.G., Ju, M.S., Huang, Y.L., Chen, H.J., Rosowsky, D.V. and Pan, A.D.(1993), "Research of steel scaffold accident during construction period", Labor Checking Report, the Council of Labor Affairs, Taipei, Taiwan, 156.
  7. Yen, T., Chen, W.F, Lin, Y.C., Huang, Y.L. and Chen, H.J. (1994), "Study of steel scaffold supports subjected to unsymmetrical loads and lateral loads", Labor Checking Report IOSH 83-S222, the Council of Labor Affairs, Taipei, Taiwan, 197.
  8. Yen, T., Chen, W.F, Lin, Y.C., Huang, Y.L. and Chen, H.J. (1995), "Study of the interaction between wooden shores and steel scaffolds and development of collapse warning system", Labor Checking Report IOSH 84- S121, the Council of Labor Affairs, Taipei, Taiwan, 95.
  9. Yen, T, Chen, H.J., Huang, Y.L., Chen, W.F, Chi, R.C. and Lin, Y.C. (1997), "Design of scaffold shores for concrete buildings during construction", Journal of the Chinese Institute of Engineers, 20(6), 603-614.
  10. Walker, A.C. (1981), "Study and analysis of the fIrst 120 failure cases", Report: Structural Failures in Buildings, The Institution of Structural Engineers, London.

Cited by

  1. Structural instability of multi-storey door-type modular steel scaffolds vol.26, pp.7, 2004, https://doi.org/10.1016/j.engstruct.2004.02.006
  2. Experimental and numerical studies of practical system scaffolds vol.91, 2013, https://doi.org/10.1016/j.jcsr.2013.07.028
  3. Effects of geometrical shape and incremental loads on scaffold systems vol.63, pp.4, 2007, https://doi.org/10.1016/j.jcsr.2006.07.006
  4. Stability study on structural systems assembled by system scaffolds vol.137, 2017, https://doi.org/10.1016/j.jcsr.2017.06.004
  5. Scaffold research — A review vol.98, 2014, https://doi.org/10.1016/j.jcsr.2014.01.016
  6. Structural modelling of support scaffold systems vol.67, pp.5, 2011, https://doi.org/10.1016/j.jcsr.2010.12.007
  7. Analytical and experimental bearing capacities of system scaffolds vol.10, pp.1, 2009, https://doi.org/10.1631/jzus.A0820010
  8. Sequential pattern load modeling and warning-system plan in modular falsework vol.16, pp.4, 2003, https://doi.org/10.12989/sem.2003.16.4.441
  9. Load-carrying capacities and failure modes of scaffold-shoring systems, Part II: An analytical model and its closed-form solution vol.10, pp.1, 2000, https://doi.org/10.12989/sem.2000.10.1.067
  10. Research on the Time-Varying Interaction of Structure and High Assembled Support System vol.243-249, pp.1662-8985, 2011, https://doi.org/10.4028/www.scientific.net/AMR.243-249.112
  11. Influence of the Structural Performance of Steel Tubular Scaffold Based on Measured Imperfection vol.256-259, pp.1662-7482, 2012, https://doi.org/10.4028/www.scientific.net/AMM.256-259.754
  12. Prediction on load carrying capacities of multi-storey door-type modular steel scaffolds vol.4, pp.6, 2004, https://doi.org/10.12989/scs.2004.4.6.471
  13. Bay 수와 가새재 설치가 시스템 비계 극한거동에 미치는 영향 vol.35, pp.3, 2000, https://doi.org/10.14346/jkosos.2020.35.3.6