| 英文摘要 |
Recent studies have shown that the rocking of spread foundation has beneficial effect on the dynamic performance of columns by decreasing the plastic deformation occurring at the plastic zone. This implies that the ductility demand of columns can possibly be reduced. However, generally, rocking is still not an acceptable mode of response in design code. In order to gain better understanding of the problem and in turn to have more confidence in taking its benefit into consideration during design and retrofit process, a series of experiments were performed and an analytical model was established. These experiments on rocking behavior include two pseudo-dynamic tests followed by a cycling test. From these tests, the rocking behavior of a column undergoing different levels of earthquake was obtained. In addition, an analytical model which can consider the nonlinear interaction between foundation and underlying soil was established also using Sap2000N. This analytical model was validated through the comparison with the experimental data. Using this analytical model, a parametric study was performed and the influence of foundation size and soil spring stiffness on rocking behavior was discussed. |
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