CONNECTING PARAMETERS OPTIMIZATION ON UNSYMMETRICAL TWIN-TOWER STRUCTURE LINKED BY SKY-BRIDGE

摘要

Based on a 3-DOF model of twin-tower structure linked by a sky-bridge,the frequency response functions and power spectral density (PSD) functions of the structural displacement,and then the time-averaged total vibration energy,are derived with the white noise as the earthquake excitation.Taken the linking stiffness and damping ratio as the research parameters,the effects of them on the structural vibration responses are studied aiming at minimizing the vibration energy of the independent monomer tower or the integral structure,respectively,and then the optimal connecting parameters are obtained.Furthermore,the influences of the sky-bridge elevation position on the optimal linking parameters of two multi-story-towers connected structure are researched numerically.Finally,the seismic responses of the mega-structure,excited by E1 Centro,Taft and artificial waves,are comparatively researched in time domain,respectively.The research results show that the connecting parameters at either end interactively affect the responses of the towers.While the optimum parameters of dampers cannot reduce the seismic responses of the both towers to the best extent simultaneously,the structural performance shows fine seismic reduction effectiveness with the damping connections.The optimal connecting parameters derived from the simplified 3-DOF model are also applicable for two multi-story structures linked by sky-bridge with dampers.