The load variability is large;
The fastener connection node is semi-rigid, and the node rigidity is related to the fastener quality and installation quality, and the node performance has a large variation;
The scaffolding structure and components have initial defects, such as initial bending and rust of the rod, erection size error, load eccentricity, etc.;
The connection point with the wall has a large variation in the constraint of the scaffolding. The research on the above issues lacks systematic accumulation and statistical data, and there is no condition for independent probability analysis. Therefore, the adjustment coefficient of the structural resistance multiplied by less than 1 is determined by calibration with the safety factor used in the past. Therefore, the design method adopted in this specification is essentially semi-probabilistic and semi-empirical. It is the basic condition of design calculation that the scaffolding meets the structural requirements specified in this specification.
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