为保证高支模满堂支架的安全，有必要全面掌握高支模满堂支架的力学及变形行为，有限元法是对这种大规模复杂结构进行数值计算分析的首选．文中首先建立了某互通主线桥某跨现浇箱梁高支模满堂支架的有限元模型，计算分析了支架系统的轴力、拉压应力及位移；然后对实体支架系统预加荷载，并测量各测点的沉降和应变，以验证支架系统的安全性及数值计算的可靠性．结果表明：支架最大应力值与位移值均未超过钢管的强度值，支架系统的刚度和稳定性满足施工要求，Midas有限元程序适用于高支模满堂支架系统的数值模拟．

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.