Advanced Steel Construction

Vol. 13, No. 3, pp. 293-317 (2017)




Jui-Lin Peng1*, Chung-Sheng Wang2, Chung-Wei Wu3 and Wai-Fah Chen4

1Professor, Department of Civil and Construction Engineering, National Yunlin University of Science and Technology, Taiwan, ROC

2Ph.D. Student, Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Taiwan, RO.

3Ph.D., Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Taiwan, ROC

4Research Professor, Department of Civil Engineering, University of Hawaii, USA

*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 8 February 2017; Revised: 27 March 2017; Accepted: 25 May 2017




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The heavy-duty scaffold system has a higher load capacity than the frame-type steel scaffold system. The independent setup of heavy-duty scaffold system is totally different from a row-style setup of frame-type steel scaffold system in construction. This study explores the load capacity and failure model of full-scale heavy-duty scaffold systems to elucidate their stability behaviors. The results of the study based on lab tests reveal that the load capacity and failure model of an independent three-story heavy-duty scaffold are similar to those of an independent two-story heavy-duty scaffold, with no apparent reduction in the load capacity. For a given height of the structure, the load capacity of a combination of independent two-story heavy-duty scaffolds with steel shores that are made of thin tubes is much lower than that of an independent three-story heavy-duty scaffold. In load tests on outdoor heavy-duty scaffolds with steel shores made of thin tubes, after loading, the entire structural system failed promptly without warning. A second-order inelastic analysis herein demonstrates that the tested and analyzed load capacities of various setups of heavy-duty scaffold systems are very close, revealing that the second-order inelastic analysis is suitable for heavy-duty scaffold systems. On construction sites in Taiwan, heavy-duty scaffolds with shores are often adopted, and the load capacity of the overall combined scaffold system is estimated from the strength of a single member used in the design of a traditional building steel structure. Hence, the load capacity of a heavy-duty scaffold system that is combined with shores of a thin tube tends to be overestimated, leading to a very high risk of collapse the combined scaffold system. Therefore, on a construction site, such a combined setup should be avoided. A heavy-duty scaffold system without any other shores on the top should be used on construction sites.



Critical load, failure model, heavy-duty scaffold, load capacity, stability


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