The construction of urban infrastructures such as bridges and tunnels located on the fault rupture line is inevitable in many cases. Therefore, various solutions have been proposed to reduce the damage to the national vital arteries. In this research, grid caisson foundations have been used for the bridge foundation system to reduce the destructive effects of fault rupture propagation. First, the three-dimensional finite element numerical model was validated using laboratory models. By comparing the deformation of the ground surface due to normal fault rupture between the numerical and laboratory models, a maximum difference of 5% was observed, which had a good accuracy. Then, a parametric study was performed to influence the parameters such as foundation thickness, foundation stiffness, relative position of the foundation to the fault outcrop, and the continuity of the bridge slab deck on the global performance of the bridge. The results of numerical studies showed that mat foundation cannot meet the overall stability of the bridge under normal fault rupture. The grid caisson system has better performance. This system was able to withstand large tectonic deformations. Indeterminate of the structure has caused negative effects on the elements of the structure. While reducing the indeterminate degrees of the structure, it reduces the stress on the pier and the deck of the bridge slab. The use of loose sandy soils results in more contact of the foundation with the subsoil, and its differential settlement is less than in the case where dense sandy soils are used.

在许多情况下，位于断层破裂线上的桥梁、隧道等城市基础设施的建设是不可避免的。因此，人们提出了各种解决方案来减少对国家重要动脉的损害。在这项研究中，网格沉箱基础已被用于桥梁基础系统，以减少断层破裂传播的破坏性影响。首先，使用实验室模型验证三维有限元数值模型。通过比较数值模型和实验室模型之间正断层破裂引起的地表变形，观察到最大差异为5%，具有良好的精度。然后，进行参数研究以影响地基厚度、地基刚度、地基与断层露头的相对位置等参数，以及桥面板桥面的连续性对桥梁整体性能的影响。数值研究结果表明，垫式基础不能满足正常断层断裂下桥梁的整体稳定性。网格沉箱系统具有更好的性能。该系统能够承受大的构造变形。结构的不确定性对结构的元素造成了负面影响。在减少结构的不确定度的同时，减少了桥墩和桥面板的应力。松散沙土的使用导致地基与底土的更多接触，其差异沉降小于使用密沙土的情况。数值研究结果表明，垫式基础不能满足正常断层断裂下桥梁的整体稳定性。网格沉箱系统具有更好的性能。该系统能够承受大的构造变形。结构的不确定性对结构的元素造成了负面影响。在减少结构的不确定度的同时，减少了桥墩和桥面板的应力。松散沙土的使用导致地基与底土的更多接触，其差异沉降小于使用密沙土的情况。数值研究结果表明，垫式基础不能满足正常断层断裂下桥梁的整体稳定性。网格沉箱系统具有更好的性能。该系统能够承受大的构造变形。结构的不确定性对结构的元素造成了负面影响。在减少结构的不确定度的同时，减少了桥墩和桥面板的应力。松散沙土的使用导致地基与底土的更多接触，其差异沉降小于使用密沙土的情况。结构的不确定性对结构的元素造成了负面影响。在减少结构的不确定度的同时，减少了桥墩和桥面板的应力。松散沙土的使用导致地基与底土的更多接触，其差异沉降小于使用密沙土的情况。结构的不确定性对结构的元素造成了负面影响。在减少结构的不确定度的同时，减少了桥墩和桥面板的应力。松散沙土的使用导致地基与底土的更多接触，其差异沉降小于使用密沙土的情况。