| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
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