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为保护古城墙,以故宫角楼位置的城墙为例,研究了角楼内增设文物对城墙的受力性能影响。利用ANSYS仿真技术,根据城墙砌体及城土的力学参数,建立了角楼处城墙有限元模型,进行了接触分析。通过分别考虑角楼内增设文物前后两种工况,研究了城墙的内力和变形,获得了不同条件下角楼处城墙的承载能力。结果表明:角楼内增设文物前后,城墙的变形及压应力变化不大,且在容许值范围内;但城墙的主拉应力峰值在增设文物后超过容许值。因此,从保护文物角度上讲,现有角楼处城墙承载性能已达到正常使用极限状态,不适宜存放增设文物。
In order to protect the ancient city walls, taking the city wall at the location of the Forbidden City as an example, this paper studies the influence of additional cultural relics in the turret on the mechanical performance of the city walls. Using ANSYS simulation technology, according to the mechanical parameters of urban masonry and urban soil, the finite element model of the city wall at the turret was established and the contact analysis was carried out. By separately considering the two conditions before and after adding cultural relics in the turret, the internal forces and deformation of the wall were studied and the bearing capacity of the wall at the turret was obtained under different conditions. The results show that the deformation and compressive stress of the city wall have little change before and after the addition of cultural relics in the turret, and are within the allowable range. However, the peak value of the main tensile stress of the wall exceeds the allowable value after the additional cultural relics are added. Therefore, from the point of view of protecting the cultural relics, the existing bearing capacity of the wall at the corner tower has reached the limit of normal use and is not suitable for storing additional cultural relics.