Abstract
Soil-Structure Interaction effects on the performance of Tuned-Mass-Damper are studied by a fully three-dimensional model consisting of a structure instrumented with TMD on top, and with foundation embedded in layered half-space. The influence of a variety of parameters on TMD performance, such as the structure aspect ratios and height, the foundation embedment and the soil-layer thickness, are investigated by comparing structure responses of TMD-instrumented system with un-instrumented system. The performance degradation of TMD due to ignoring SSI, is studied by comparing the efficiency of a well-tuned damper, with one which is off-tuned to the fixed-base frequency of the structure. It is shown in case studies of four buildings in California that a well-tuned damper performs better than an off-tuned one by up to 25%, although an off-tuned one may also reduce the structure responses by up to 30%.
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