Wind-induced vibrations of torsionally coupled systems with soil-foundation-structure interaction

Abstract eng:
The objective of this paper is to investigate the wind-induced vibrations of high-rise buildings with soil-foundation-structure interaction (SFSI). The computational procedure for an analytical model including the soil-foundation-structure model, wind load model and frequency domain analysis is presented for this purpose. Numerical examples, i.e., two types of structures: the torsionally uncoupled and coupled systems, on four types of grounds: the fixed base, hard, medium and soft soils, for a variety of attack angles, are also provided to illustrate the analytical model. For each structure under a variety of attack angles, the peak acceleration for the case of the hard soil nearly coincides with that of the fixed base, and the lower soil stiffness leads to a decrease in the peak acceleration. These results suggest that the SFSI can be reasonably neglected for simplified analysis under the condition of high soil stiffness. On the other hand, the response will be overestimated under the condition of low soil stiffness if the SFSI is assumed to be negligible. Consequently, compared to the fixed-based models, the soil-foundation-structure model can be used to more appropriately simulate the wind-induced vibrations of high-rise buildings with SFSI. INTRODUCTION In the last several decades, light-weight and high-strength materials have been widely used in the construction of high-rise buildings. Such structures are susceptible to wind excitations due to their light, flexible and low-damping characteristics. Furthermore, the structural responses are affected by foundations and surrounding soils, implying that the soil-foundation-structure interaction (SFSI) has to be considered distinguished from the fixed-base models. Since the dynamic properties of coupled soil-foundation-structure systems as well as the characteristics of wind excitations are complex, it is necessary to fully understand the mechanism of the interaction among soils, foundations and structures, which provides the essential information to accurately calculate the structural vibrations under the complicated wind excitations. The objective of this paper is to investigate the wind-induced vibrations of high-rise buildings with SFSI. The computational procedure for an analytical model is presented for this purpose. Numerical examples are also provided to illustrate the analytical model. ANALYTICAL MODEL The computational procedure for an analytical model including the soil-foundation-structure model, wind load model and frequency domain analysis is presented in Figure 1, which will be discussed in this section.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket