The Simulation And Analysis On Piles-Soil-Structure Interaction System Effected By Earthquakes

To be an abrupt natural disaster, the earthquake makes vast damage to human community. Improving the resistance to vibration of buildings is important to our lifes. Branch-pile is a new type of piles that have good engineering properties such as anti-seismic. However, limited by facilities and cost, current studies have been mostly focused on theoretical study and calculational analysis, and little experimental work on branch-pile has been published, especially on engineering properties under earthquake actions. Study on Soil-Structure Interaction (SSI) is of great importance to predict the seismic responses of structure exactly. So experimental study on dynamic characteristics of Branch Piles-Soil-Structure Interaction System is helpful and very significant.The simulation and analysis are based on an experiment cared out on the shaking table in Tongji Univercity. ANSYS FEM program has been used to study the characteristics of branch-piles, interaction laws and effects of system interaction on structure under earthquakes.Vibration energy caused by different earthquakes will be absorbed by the branch-pile foundation differently. The absorbing rate of vibration energy depends on its frequency. The more similar frequencies vibration energy and branch-pile foundation owned, the less vibration energy it would be lost. There are two kinds of movement caused by vibration, one is the foundation's rotation, the other is x direction's displacement. Branch parts of piles play the most important role when earthquake comes, and their influence is different when their location is changed. The calculation result shows that the branch-piles can raise the anti-seismic ability of foundation and system efficiently, and reduces the reaction of structure under seismic wave. It has very important meaning for resisting earthquake and reducing seismic damage.