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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。
It is very difficult to monitor the jack-up construction of large ancient buildings. In order to ensure that the structure does not crack and other damage during jacking, it is necessary to carry out numerical simulation analysis of the construction. Taking into account the specific circumstances of the jacking construction, the finite element analysis model of the main hall of the Nanjing Museum was established to simulate the typical unfavorable load conditions during jacking construction with different displacement time history curves. Width as a judge, the numerical simulation of the jacking construction of the old hall. The analysis results show that the displacement of the building should be monitored strictly and the hazard of the displacement time difference increases significantly with the increase of the displacement difference. By using the method of dividing the time difference of displacement, Poor ability; jacking can be structural stiffness partition, different stiffness of the area can choose different monitoring accuracy.