Analysis on Seismic Performance of Building With Viscous Dampers Considering Soil-Structure Dynamic Interaction

Abstract eng:
Buildings are usually constructed on soft soil, so there exists the soil-structure-dynamic interaction (SSI). The SSI has been considered to be an important factor in the study of structure vibration control because soil-structure interaction is generally known have effect on the dynamic response of a building structure. In this paper, the general finite element analysis program ANSYS was adopted to analyse the dynamic responses of the frame structures with viscous dampers considering soil-structure-dynamic interaction. The structures were ten-story cast-in-place concrete frames with six bays and three spans. The piled raft foundation was adopted as the foundation. In the analysis model, the equivalent linearization method was used to analyse the nonlinear behaviour of the soft soil. A material damping input method available in ANSYS was adopted to account for the difference of the soil damping ratio and that of the concrete superstructure in SSI systems. Shanghai bedrock waves were selected as the input earthquake, called SHW1 wave and SHW2 wave. In the process of meshing, the soft soil was meshed using the three-dimensional solid elements, the beams, columns of the superstructure and the group pile foundation were meshed using the three-dimensional beam elements, the slabs were meshed using the shell elements, and the viscous dampers were meshed using the combine elements. The dynamic responses of energy dissipation structures in which the coefficient of dampers, soil parameters and foundation forms were discussed considering soilstructure interaction and assuming fixed-base case. The results indicate that the viscous dampers have suppress the vibrations of structures considering the SSI effect and fixed-base case. The influence of SSI effect on the structure’s floor displacement and inter-story damping effect of viscous dampers is not always increasing with the rise of damper’s coefficient, but decreases when coefficient comes to a certain degree. Moreover, the larger the ratio of damping rate is, the greater influence of SSI is on the damping effect of viscous dampers. In addition, the degree of soft and hard of soil was varied to study the influence of soil parameters on the damping effect, and the results show that degree of soft-hard soils could influence the even degree that damping effect along the floors. Finally, two forms of foundation, box foundation and piled raft foundation, were adopted and the results of box foundation were compared with that of piled foundation, elucidating that the damping effect of box foundation is worse than that of piled raft foundation, but different SSI effects on the two forms of foundation could make up the different damping effect.

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