Abstract
Background: Guardrails are structures that protect workers from falling from heights at construction sites. Objective: The objective is to evaluate experimental models by applying static and impact loads to wood and steel guardrails. Methods: Brazilian and international standards were consulted to define the actions applied to guardrails, which were tested experimentally in three models of each material in a full-size prototype. Results: The experimental results indicate that the models studied could support the applied loads, and no local or global system rupture occurred. However, the displacements for the static load of 1500 N/m required by Brazilian RTP 01 for both models did not comply with Brazilian standard NBR 14718 because they had displacements above 20 mm, despite meeting other international standards for static testing and impact testing. Conclusion: From the results obtained in the experimental tests, it was possible to verify that the structures withstood the applied loads and could be used safely in civil construction works. However, the load requirements of RTP 01 are excessive, and NBR 14718 is not suitable for checking temporary guardrail structures. This demonstrates the need for the Brazilian standard to be revised to guide the dimensioning and verification of structures in order to adapt to international standards.
Highlights
Civil construction is one of the economic sectors with the highest number of occupational accidents
From the results obtained in the experimental tests, it was possible to verify that the structures withstood the applied loads and could be used safely in civil construction works
The load requirements of RTP 01 are excessive, and NBR 14718 is not suitable for checking temporary guardrail structures. This demonstrates the need for the Brazilian standard to be revised to guide the dimensioning and verification of structures in order to adapt to international standards
Summary
Civil construction is one of the economic sectors with the highest number of occupational accidents. The performance and resistance requirements for the protective structures are specified by OSHA 1926.502 [3] in the United States of America, EN 13374 in the European Union [6], S-2.1, r.4 in Canada [5], AS/NZS 4994 [7, 8] in Australia and New Zealand, and in Brazil by NR 18 [9], NR 35 [4], and RTP 01 [10]. These standards show divergence in some aspects. Guardrails are structures that protect workers from falling from heights at construction sites
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