Advanced Steel Construction

Vol. 11, No. 2, pp. 185-210 (2015)


LOAD-CARRYING CAPACITY OF SINGLE-ROW STEEL SCAFFOLDS WITH VARIOUS SETUPS

 

Jui-Lin Peng1,*, Chung-Ming Ho2, Chen-Chung Lin3 and Wai-Fah Chen4

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

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

3 Associate Researcher, Institute of Occupational Safety and Health, Council of Labor Affairs, Executive Yuan, Taiwan, ROC.

4 Professor, Department of Civil and Environmental Engineering, University of Hawaii at Manoa, Hawaii, USA.

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

 

Received: 19 February 2014; Revised: 16 May 2014; Accepted: 30 June 2014

 DOI:10.18057/IJASC.2015.11.2.4

 

ABSTRACT:

Factors such as high headroom and large spans explain why some areas of a reinforced concrete building, including the entrance lobby of a hospital or the stage area of an auditorium, often require large-scale isolated reinforced concrete beams to support the weight passed down from the slab. On a construction site, single-row steel scaffolds are often set up underneath these isolated beams to function as falsework. The setup method of these steel scaffolds is unique and design-related information is lacking. Single-row steel scaffolds are often set up on a construction site based on the construction experience of workers, explaining the occasional collapses of steel scaffolds underneath the isolated beams. Therefore, this study closely examine why single-row steel scaffolds collapse. Experimental results indicate that treating the variation of headroom under the isolated beams involves using single-row steel scaffolds with different setups. The load-carrying capacities of one-bay, two-story door-type steel scaffolds (2D) closely resemble those of one-bay, three-story door-type steel scaffolds (3D). When multi-bay setups are used, the load-carrying capacities of two-story door-type steel scaffolds (2D) increase with the number of bays. Similarly, when multi-bay setups are used, the load-carrying capacities of one-door, one-square, two-rectangle steel scaffolds (DS2R) also increase with the number of bays. Although the height of the DS2R setup exceeds that of the 2D setup, the load-carrying capacity of the DS2R setup is still higher than that of the 2D setup. This finding demonstrates that structural stiffness of the combined setup of steel scaffolds is higher than that of two-story door-type steel scaffolds. A more convenient design of the strength of steel scaffolds is possible by quickly estimating the load-carrying capacity of a single-row, multi-set steel scaffolds based on that of single-row, one-set steel scaffolds. By applying the second loading, this study also simulates the load-carrying capacity of the steel scaffolds using reusable materials in the worst condition in order to obtain the strength reduction factors of the reusable steel scaffolds. When designing the strength of single-row reusable steel scaffolds, designers may select proper strength reduction factors with different standard deviations based on project fund and safety requirements. Moreover, steel scaffolds with defects randomly selected from the construction site are evaluated. Test results indicate that the load-carrying capacities of the steel scaffolds with defects exceed those of the reusable steel scaffolds in the worst condition. This finding suggests that the strength of the steel scaffolds with defects is still reusable. The vertical displacements of various setups of steel scaffolds under maximum load provide a valuable reference for contractors in designing the isolated reinforced concrete beams when construction accuracy must be considered. The results of this study significantly contribute to efforts to determine related parameters in follow-up numerical analyses in the future.

 

Keywords: Load-carrying capacity, Scaffold, Single-row setup, Steel scaffold

 

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