古建筑顶升托换钢梁力学行为分析

MECHANICAL PROPERTIES OF STEEL BOX BIRDERS DURING A JACKING-UP PROJECT OF AN ANCIENT BUILDING

对古建筑整体顶升工程托换结构施工中钢箱梁的顶推过程进行研究,重点分析了千斤顶的顶推力,托换钢箱梁的受力和变形特征。结果表明:千斤顶顶推力的理论计算结果与现场实测结果基本一致,有限元分析可以模拟工程实际;千斤顶最大顶推力随着顶推深度的增加而上升;托换钢箱梁在千斤顶顶推工作过程中不会破坏,能够满足强度要求;掏土后钢箱梁上下钢板的变形较小,能够满足刚度要求。

The incremental launching process searched in this paper. They base on an integrall of steel box girders in underpinning structure are re- y jacking - up project of an ancient building with the measured data. The key problems are the thrust force of the jacks, the stress and deformation properties of the steel box girders. The result shows： The thrust forces of jacks calculated by the finite element model are generally in agreement with the results measured on site; therefore, the finite element analysis can be used to model actual results. As jacking deepens increase, the maximum thrust force of jack rises as well. The strength requirement can be satisfied as the steel box girders do not give in during the jacking process. After soil is excavated, deformation of the steel box girders is very small, which meets the rigidity requirement.