Amplification And Earthquake Response Analysis Of High-rise Building

There are more and more high-rise buildings in China, and the actual earthquake shows that, even in areas far from the epicenter, high-level responses are more intense, causing more panic. In general, the seismic response increases with higher floors. Seismic intensity scale in China shows: the feeling of people in the high-rise building is stronger than the feeling in the room on the ground, but do not know the extent and patterns of specific amplification. In this paper, six typical concrete high-rise structures were calculated and analyzed, compared to a different site conditions and structure of different heights on the amplification of the earthquake, the degree and the amplification of specific rules obtained. This people on the top layer of by which to determine the actual intensity through the reaction of the floor, to judge actual Seismic intensity and reduce the panic of people on the high level.Shear wall is commonly used in high-rise buildings as lateral force resistance components, but the numerical simulation of nonlinear shear wall has not been solved, so this paper attempts to establish shear wall numerical model using shell element, and compared to the experimental results to verify its reliability.1. To study the relationship between different site conditions and different heights and the amplification of ground motion, this paper chose six typical high-rise buildings or super high-rise buildings. The result shows that: the response of high-rise buildings on hard site is weaker, and the amplification of the floor was not obvious; the response of high-rise buildings on medium site is more obvious. The magnification of top floor of 20-story buildings is about 1.4 to 2.6 and the magnification of top floor of 40-story buildings is about 3.5; the response of high-rise buildings on soft site is the most strong, and level amplification is particularly pronounced. The magnification of top floor of 20-story buildings is about 2.7 to 3.2 and the magnification of top floor of 40-story buildings is about 4.3.2. To investigate the perception of high-rise buildings to the earthquake, this paper calculates acceleration response spectrum of each floor for these six high-rise buildings, which have two obvious peak frequency bands, corresponding to the predominant period of ground motion and the natural cycle of structure. Medical researches and the dynamic experiments show that people's cycle of the various activities are generally concentrated in the 0.33~1s. In this section, the value of the corresponding floor response spectrum increases with floor height of the structure increases, so the feeling of people on the top floor is more strongly.3. To discuss the macroeconomic performance of the people in high-rise story, this paper calculates the floor peak acceleration of the six buildings. According to the relationship between human feeling and gravitropic motion peak acceleration in the Chinese seismic intensity scale, results show that: the human feeling of top roof of high-rise buildings on the hard site is identical with that on the ground in the actual intensity; on medium site the human feeling on the 20-story building is about 1 degree bigger than that on the ground in the actual intensity, and the human feeling on the 40-story building is about 1 to 2 degree bigger than that on the ground in the actual intensity; on soft site the human feeling on the 20-story building is about 1 to 2 degree bigger than that on the ground in the actual intensity, and the human feeling on the 40-story building is about 2 degree bigger than that on the ground in the actual intensity. Based on these correlations, when the earthquake occurs, people can reasonably estimate earthquake intensity and reduce the unnecessary psychological panic.4. To verify the feasibility of the shell element in the establishment of shear wall numerical model and non-linear seismic response analysis, this paper adopts ABAQUS shell element model to establish the shear wall model and do its nonlinear analysis. Numerical simulation results agree well with the experimental results, indicating that the model is reasonable. Using the same modeling principle to establish reinforced concrete shear wall structure, founding the structure meets the limit requirements about story drift ratio of 1/120 in rare earthquake.The relevant researchers and engineers can refer to the results calculated.