| 摘要(英) |
In practice, the 1D model is frequently used to analyze the seismic responses of a soil stratum. When the ground improvement is performed over a finite region of a soft soil stratum, the 1D assumption of the ground is violated and the problem becomes a 3D one.
In this study, a 3D nonlinear finite element model is used to compute the surface ground motions of an improved soil zone. The results are compared with the previously obtained results using 1D and 2D ground models. Their effects on the seismic response analyses of a ten-story building are also studied.
For an improved soil zone, the seismic responses computed using 1D model will be underestimated, while the 2D and the 3D ground models show similar acceleration spectra, with 2D model results showing higher values. Thus, for such a case, the surface ground motion must be obtained using the 2D or the 3D ground model if the design ground motion is specified at the engineering bedrock. When the width of the improved zone is larger than 400 meters, the 1D model can be adopted to simulate its seismic responses. For the dynamic responses of a building located on top of an improved soil zone, if the input ground motion is computed using the 1D ground model, then the response will be underestimated; thus, for such a case, the surface ground motion must be obtained using motions obtained by the 2D or the 3D ground models. will be better. The seed numbers for generating the artificial earthquakes have significantly effects on the seismic responses of ground and the maximum drift ratio of the building. Although it has been proposed that the average value of the responses from at least seven artificial earthquakes be used, some differences still can be observed for different combinations from ten responses of artificial earthquakes. |
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