结构-土-结构动力相互作用对结构系统频率的影响
Effects of Structure-Soil-Structure Dynamic Interaction on the Frequency of Structural Systems

采用间接边界元法，研究结构-土-结构动力相互作用对结构系统频率的影响。数值分析表明，与不考虑相邻结构的结果相比，结构-土-结构动力相互作用可能增大或减小结构的系统频率，SH波垂直入射时，影响程度达5%，SV波垂直入射时，影响程度达3%。随着结构间距离的增大，结构-土-结构动力相互作用对结构系统频率的影响程度并不单调下降，还与场地的动力特性和结构的动力特性有关。结构-土-结构动力相互作用对结构系统频率的影响可能对结构健康监测结果造成一定影响，值得注意。
The effects of structure-soil-structure dynamic interaction on structural system frequency were studied using the indirect boundary element method. Numerical analysis showed that, compared to those of stand-alone structures, the structure-soil-structure dynamic interaction may increase or decrease system frequency. The influence degree was about 5% under vertical SH incidence and 3% under vertical SV wave incidence. With increasing distance between structures, the effects on the structural system frequency did not show a monotone decrease, which was related to the dynamic characteristics of the site and structure. These results suggest that more attention should be focused on the fact that the influence of structure-soil-structure dynamic interaction on system frequency may affect monitoring results of structural health