Abstract
In order to reduce the costs and improve the overall performance of building systems, the static optimized design with variable rigidity of piled raft foundations has been widely used in recent years. Variable rigidity design of piled raft foundations that support midrise buildings in high-risk seismic zones can alter the dynamic characteristics of the soil-pile-structure system during an earthquake due to soil-pile-structure interaction. To investigate these aspects, a nuclear power plant sitting on multilayered soil is simulated numerically. The paper describes a numerical modeling technique for the simulation of complex seismic soil-pile-structure interaction phenomena. It was observed that the total shear force on top of the piles and the rocking of the raft are reduced after optimization, whereas the displacement of the superstructure is nearly unaffected. The findings of this study can help engineers select a correct pile arrangement when considering the seismic performance of a building sitting on soft soil.
Highlights
A numerical simulation of a soil-pile-structure system was performed in ANSYS 17.0 software. e effects of optimizing the design of a piled raft foundation on the response spectrum of the system, rocking of the raft, displacement of the superstructure, and total shear force on the pile heads are investigated. e results of this study can help engineers choose a favorable optimized design for the piled raft considering the seismic performance of the structure on soft soil
Even though the optimized arrangement of the piles can minimize the differential settlement of piled raft foundations, it can result in a variable rigidity distribution of the foundation system [20]
Because of natural period lengthening induced by the optimized design of the piled raft foundation, the spectral acceleration (Sa) decreases, which reduces the total shear force to at least 10% on top of the piles (Figure 11). e maximum accelerations of the base of the structure in two directions are all reduced after optimizing the design as shown in Figure 12, and the value of the reduction in the y direction is slightly bigger than in the x direction
Summary
Van Nguyen et al [17] analyzed the influence of pile size and load-bearing mechanism on the seismic performance of Mathematical Problems in Engineering buildings and showed that the type and size of the piles influence the dynamic characteristics and seismic response of the building due to interaction between the soil, piled raft, and structure. Previous studies have provided valuable contributions, further investigations are essential to fully understand the influence of optimized piled raft foundations with different pile diameters and spacing on the seismic performance of asymmetric buildings due to complex SPSI phenomena. E direct method is preferred modeling of the complex nature of SPSI in dynamic analysis [9, 17] and is applied in this paper To achieve this goal, a numerical simulation of a soil-pile-structure system was performed in ANSYS 17.0 software. Two variable-rigidity optimized design schemes for piled raft foundations are used for comparison with traditional design schemes having uniform piles
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