| dc.description.abstract | In recent years, the earthquake caused many disasters in Taiwan, so seismic design specification to improve the design seismic forces. Therefore the spread foundation wide obviously is too large in some reinforcement and new cases. The main reason is improving the design seismic forces. And the foundation of pressured area have to satisfy the specification, therefore the size of foundation must be expanded. Based on the past experience, the rocking mechanism of spread foundation can reduce the seismic force of the main structure, besides it can extend the period of structure and decrease the seismic force. In addition, the soil will generate the plastic behavior and absorb the seismic energy under the extreme earthquake. This study aims to develop new soil element model and build the soil and foundation of components.
The Vector Form Intrinsic Finite Element (VFIFE), a new computational method is adopted in this study because the VFIFE has the superior in managing the engineering problems with material nonlinearity, discontinuity, large deformation and arbitrary rigid body motions of deformable bodies. In order to simulate the interaction between soil and foundation, the study use Winkler model (Winkler-based models). Winkler model can simulate the vertical soil (q-z spring), lateral passive soil (p-x spring) and the friction force between soil and foundation (t-x spring). Through numerical simulation of examples to verify the soil element model are feasible and accurate. Besides, using the single-span bridge to confirm the rocking mechanism of spread foundation has the isolation effect. Finally, five-span continuous bridge as a model to investigate the effect of the parameter changes, and to understand the bridge behavior in ultimate condition. | en_US |