Research on the Stability of Sorbite Stainless Steel Temporary Large-Screen Scaffolding with Pin-Type Joints Under Horizontal Loading

As a large-scale international event， the Beijing Winter Olympics adopted a a large number of scaffolding for the construction of temporary stands or stages. This study takes a sorbite stainless steel temporary large-screen scaffolding support frame with pin-type joints as the research object. A 2×1 full-scale model was designed and fabricated. Unidirectional horizontal loading tests were conducted to investigate its slip pattern， displacement response， and strain distribution under upper loading conditions of no load， 0.5， 1.5， 2.5 kN/m². The load-displacement curves were plotted， and the structural slip loads were obtained. The local wind force of 8-12 levels in the competition zone was selected for experimental comparison to verify the safety and stability of the frame structure in practical engineering applications. The results showed that during the whole loading process， no obvious slippage occurred in the frame structure， and no noticeable deformation was observed at any of the joints. The primary form of structural deformation was overturning. Under the conditions of no counterweight and a bottom counterweight of 0.5 kN/m²， a gap was observed between the bottom row of uprights and the support. In contrast， under the conditions of 1.5 kN/m² and 2.5 kN/m² bottom counterweights， the bottom row of uprights remained tightly fitted to the support during the testing， even when loads reached 5.32 kN and 4.16 kN， respectively. In practical engineering， increasing the structural counterweight can be adopted to reduce gaps and enhance the anti-overturning capacity. Since the external load applied in the test was much higher than the actual wind load， the structural system possessed a substantial safety margin.