Study on dynamic response characteristics of a hybrid damping structure under velocity pulse near-field earthquake
The velocity pulse effect of near fault ground motion has an adverse impact on the seismic performance of structures.The consideration of near-field effect in Chinese codes is reflected by the near-field amplification coefficient of different fault distances.Taking a hybrid damping frame structure less than 5km away from the fault zone as the engineering background,a group of typical velocity pulse near-field seismic waves were selected and verified with the identification method based on wavelet analysis.At the same time,another group of seismic waves was selected based on the anti gauge wave selection method and considering the site seismic environment.On the premise of meeting the effective duration,peak ground acceleration and response spectrum similarity,compare the difference between impulse wave and standard wave selection on the structural response under medium and large earthquakes.The results show that the velocity pulse ground motion has a certain amplification effect on the structural response of near fault vibration reduction projects.The increase coefficient of the base shear force under the fortification earthquake is about 1.07,and the increase coefficient of the base shear force under the rare earthquake is about 1.18～1.19.Under the large earthquake,the energy dissipation element consumes more energy,the plastic damage of the structural members is further developed,and the amplification effect is more significant than the fortification earthquake.For short-period shock absorption structures,the response of the structure may be overestimated when the selected wave does not distinguish the velocity pulse seismic records and multiplies the near-field amplification coefficient of 1.5 according to the anti gauge.
NETL
NSTL
万方数据
维普
