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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.

EXPERIMENT AND STABILITY ANALYSIS ON HEAVY-DUTY SCAFFOLD SYSTEMS WITH TOP SHORES