The Research Of Structural Vibration Control Considering Box-pile-soil-structure Dynamic Interaction

Structural vibration control and pile-soil-structure interaction (PSSI) are the current hot issues in seismic and geotechnical engineering study. In this thesis, the dynamic properties and vibration control of the tall building structures with box-pile foundation were studied, and the main contents are as follows:1. This thesis analyzed seismic response of the high-rise building structures considering box-pile-soil-structure interaction (BPSSI). First, the analytical model considering BPSSI was established, and its equation of motion was derived, then the effect of BPSSI on the seismic response of high-rise building structure was analyzed, taking a 12-story steel frame structure as example. The results show that the displacement of structures considering BPSSI is composed of base translation, base rotation and deformation of structures. Compared with the results obtained by the rigid foundation assumptions, the absolute floor displacement of structure generally be increased accordingly, and because of the rigid base displacement caused by turning the top floor absolute displacement in the account for a significant proportion of the top floor displacement increases significantly. Therefore, during the check of displacement for the seismic design of tall buildings, it is recommended to consider the impact of BPSSI.2. The active control of high-rise buildings considering BPSSI was studied. Most of the existing structure control theory are based on the assumption of rigid foundation, which the impact of BPSSI is ignored. However, the presence of soil brings great changes of vibration characteristics for structures, which is just the base of active and passive control for structures. It brings a large gap between the control model and the actual structure, and this difference may reduce the effect of active control or even leads to a control failure. Based on Penzien model, the analytical model considering BPSSI was established, the active control equation was derived, and the effect of the BPSSI and the various major parameters of structural systems on the vibration control of tall buildings were analyzed. The results show that BPSSI have a great impact on vibration control of tall buildings; The equivalent shear wave velocity of soil around pile, the moment of inertia of pile, the box foundation stiffness and the stiffness of the upper part of the structural system have a certain influence to the active control of the high-rise buildings structure when the BPSSI is considered.3. The active control of adjacent structures considering BPSSI was studied. In order to reduce or avoid a collision during earthquake and improve the seismic performance of the adjacent structure, the experts and scholars have put forward to install the control equipment connected to the sub-structure between the structures. By adjusting the optimization vibration parameters, the structural mutual movement can consume or absorb the vibration energy, reduce the structural vibration and reduce seismic response. In the thesis, the equations of motion and control equations of the adjacent structure considering BPSSI were derived, and the effect of the BPSSI and the various major parameters of soil and structure on the vibration control of adjacent structures were analyzed. The results show that BPSSI have a obvious impact on the displacement response of adjacent structures, and a small impact on acceleration response; Pile equivalent shear wave velocity of soil, pile moment of inertia, the box foundation stiffness, and the stiffness of the upper part of the pile foundation structure have a significant impact to the active control of the adjacent structures considering BPSSI within a certain range. Hence, when we carry out the vibration control of the adjacent structures with box-pile foundation, the effect of BPSSI should be considered.