Research and Example Verification on Stability Coefficient of Vertical Bar of Fastener Steel Pipe Support

Abstract

The calculation method of steel pipe support in current specifications is not uniform, and it is unsafe to directly apply the stability coefficient of the vertical bar in the current code, which leads to frequent safety accidents of fastener steel pipe supports. Through the field statistics of the initial defects of the steel pipe, it is found that the initial bending values of the 3 m and 6 m steel pipes with the largest size are larger in L/400. The stability coefficient table is obtained by taking the initial bending of L/400 as the initial defect, which is 43.15% smaller than the stability coefficient given by the specification. Through the comparative analysis of the actual engineering monitoring results, the calculation results of the original specification and the calculation results after the correction of the stability coefficient, it is concluded that the stress calculated by the stability coefficient proposed in this paper is similar to the actual monitoring results of the project and is greater than the stress of the vertical rod calculated by the stability coefficient of the original specification. It is suggested that the corrected stability coefficient should be applied to the actual project.