Abstract:

In order to guarantee the safety of high full-space support scaffold,the mechanical behavior and defor-mation of the support scaffolds should be comprehensiVely investigated.In this paper,the finite element method,which is the preferred numerical calculation method for complex structures,was employed to develop a finite ele-ment model of the high full-space support scaffold for the construction of cast-in-situ box girder of a main line bridge on an interchange of an expressway,and the axial force,tensile stress,compressive stress and displacement of the supporting system were numerically analyzed.Then,in order to verify the safety of the supporting system and the reliability of the numerical calculation,the settlement and compressive strain at each measure point of the supporting system were monitored in the presence of provisional preloads on an actual system.The results show that(1)neither the maximum stress nor the displacement exceeds the tolerance values of the supporting steel tube;(2)the stiffness and stability of the supporting system both meet the construction requirements well;and(3)the finite element simu-lation tool Midas is feasible in simulating high full-space suppot scaffold systems.

Key words: bridge engineering, high full-space support scaffold, finite element method, most unfavorable load, displacement analysis, preload