Safety monitoring of steel space truss demolition project of fire-damaged tall building

摘要

Nowadays steel space truss structure becomes an increasing trend, but its fire resistance performance, especially in practical project, is seldom researched. The residual bearing capacity of fire-damaged space truss structure, the force-bearing condition of member bar used in fire-damaged space truss, and the accuracy of conventional temperature field analysis method are all hot spot issues to be solved. This paper, based on a steel space truss demolition project of fire-damaged tall building, elaborates the adopted method of cutting steel member bar, and meanwhile verifies the security and efficiency of that cut technology as well as the accuracy of the finite element analysis by comparing monitoring data with finite element analysis. Additionally, this paper discusses a specific analysis of eccentric force in member bar which encountered during demolition process, and proposes the solution.