Seismic Response Analysis And Isolation Effect Of RC Frame Structure Under Multi-Dimensional Near-Field Earthquake

Near-field earthquakes with velocity pulses are more destructive than distant-field earthquakes,so this paper studies the response and structural damage of non-seismic structures and basic isolation structures under seismic action by entering near-field earthquakes and long-range earthquakes.First of all,the near fault velocity pulsed seismo-type seismic movement(slip effect seismic movement and forward-directional seismic vibration)and distant site vibration are selected.At the same time,the TP12 column in the proposed static test completed by Kawashima is used for simulation analysis,which verifies the fiber beam column unit combining the concrete damage structure model and the reinforced damage structure model used in this paper,determines the effectiveness of the reinforced concrete component injury;Secondly,the six-layer frame model is established to analyze three different types of seismic movements(slip effect seismic,forward-directional seismic and far-field vibration),and the lead core rubber isolation support reduces the acceleration response of the structure,reduces the base shear force and reduces the damage effect of the structure.By observing the evolution of non-seismic structure and basic seismic structure damage under the action of slip-stroke effect seismic movement(TCU-074),the weak parts of the structure are judged.Then from each of the three different types of seismic activity,one seismic motion represents the seismic movement,and the incremental dynamic analysis is carried out by adjusting the peak acceleration(PGA)size of the seismic movement.Finally,it is concluded that:1 lead core rubber isolation support can effectively reduce the acceleration response and base shear force of each layer,but it will increase the displacement between the first layer.(2)With three different seismic actions,the damage of the first layer frame column of the non-seismic structure is larger,and when the cross-section of the frame structure column decreases,the damage at the frame column section decreases is also greater Secondly,the damage to the frame structure of the long-range earthquake is small,lead core rubber isolation support can reduce the damage of these three types of seismic shock to the structure,but the lead core rubber isolation support to the slip hedging effect seismic activity of the isolation ability is stronger than the forward seismic movement.(3)The damage of non-seismic structure in the vicinity of seismic peak acceleration is growing rapidly,and the maximum damage is quickly achieved;the overall damage of the basic isolation structure is small,the damage growth is slow,the damage value of each layer beam and column is not large,and the effect of lead core rubber isolation support isolation is remarkable.(4)The peak acceleration of local vibration is below 0.4g(rare earthquake),and the overall damage index of near-site vibration is much greater than that of distant-site vibration,because the velocity pulse effect of near-site vibration has a great impact on structural damage.