Buildings, Vol. 15, Pages 1955: Study on Semi-Rigid Joint Performance and Stability Bearing Capacity of Disc-Type Steel Pipe Support

Buildings doi: 10.3390/buildings15111955

Authors:
Fankui Zeng
Guoxin Zou
Meng Ji
Jianhua Zhang

The current lack of standardized calculation methods for disc-buckle-type steel pipe supports, coupled with unsafe calculation length coefficients, has resulted in frequent safety incidents leading to severe casualties and economic losses. In this paper, the semi-rigidity characteristics of joints were investigated through the field bending test of disc-buckle steel pipe supports. Through analysis of the bending moment–rotation curves obtained from these tests, accurate initial bending stiffness values and a calculation model for semi-rigid joints were established. Numerical simulation and analytical correction method were employed to determine the effective length correction coefficient under various erection parameters while accounting for joint semi-rigidity. The findings indicate that the slenderness ratio derived by the revised effective length coefficient is 8.13% greater than the standard value, primarily because current standards fail to adequately consider the constraint effect of the crossbar. The correction coefficient proposed in this paper provides a theoretical foundation for the safe construction of disc-type steel pipe supports, and holds significant value for engineering applications.

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