大型古建筑物顶升施工数值分析方法及应用

大型古建筑物顶升施工的监控难度很大,为了保证顶升过程中结构不发生开裂等损伤状况,有必要对其进行施工数值仿真分析。考虑顶升施工时的具体情况建立了南京博物院老大殿的有限元分析模型,以不同的位移时程曲线模拟顶升施工时可能遇到的典型不利荷载工况,以顶升过程中结构的裂缝宽度作为判断指标,对老大殿顶升施工进行数值仿真模拟。分析结果表明:建筑物顶升应进行严格的位移监控,位移时程差的危害性随位移差的增大而显著增大;用分区施加位移时程差的方法可以清楚判断各区抵抗位移时程差的能力;顶升监控可按结构刚度分区进行,不同刚度区域可选择不同的监控精度。

Numerical Analysis and Application of Lifting Construction in Large Ancient Buildings

It is extremely difficult to lift and monitor large ancient building,in order to avoid cracking,numerical simulation analysis of its construction is necessary.Finite element models of Lao Da Hall in Nanjing museum consider the specifically unfavorable load conditions of the lifting,by using the different displacement-time histories to simulate the adverse conditions during the construction,and the numerical simulation analysis of Lao Da Hall′s construction is made with the maximum crack width as an index.The results are shown as follows: Lifting the building must be monitored strictly,and the harmfulness of displacement path difference is increased with displacement difference;applying displacement path difference by partition method can clearly determine the ability of resisting displacement difference;lifting monitoring must be partitioned based on structural rigidity;for the different structure rigidity regions,we may choose different monitoring accuracy.