Seismic Damage Analysis Of Reinforced Concrete Frame-shear Wall Structure

In the course of the cumulative change of structural seismic damage, the energy change of the structure response signal must be caused. In this paper, finite element software ABAQUS based on one eight layer reinforced concrete frame shear wall structure, the plastic damage constitutive model of metal materials and the classical plastic theory of concrete materials, simulation analysis of the reinforced concrete frame shear wall structure seismic damage development process, analyzes the structure of earthquake. The damage evolution law in rare and frame shear wall structure in power output characteristics under rare earthquake, and using wavelet transform, the output signal of the top floor displacement of structure under earthquake acceleration signal and the original seismic acceleration records of decomposition and reconstruction, analysis of relationship between the distribution of energy of each band and with low frequency energy the duration of the earthquake, and then discusses the relationship between structural damage and low frequency energy to the total energy ratio. Draw as follows:(1) SATWE and ABAQUS are used to calculate the first 10 order modes and the period of the structure. The calculated results of the two software are in good agreement, which indicates that the finite element model is accurate. The dynamic response of the structure under rare earthquake is analyzed and according to the requirement of the current code, the structure can meet the requirement of 7 degree seismic fortification.(2) The seismic damage of RC frame shear wall structure can be seen directly from the damage image in the process of structural earthquake damage. The plastic damage constitutive model of concrete is used to simulate the damage process of earthquake, and the shear wall is directly observed as the first line of defense, and the frame is the second line of defense.(3) The wavelet analysis is used to analyze the dynamic response of the structure at different time periods in the frequency domain and the distribution of energy in each frequency band is discussed. Calculation results show that: With the evolution of structural damage, wavelet energy to the low-frequency phase concentration, when the low frequency energy saturates structure reaches the ultimate bearing capacity, damage state analysis results and damage simulation consistent analysis method for tall reinforced concrete structure seismic damage analysis provides a new way of thinking.(4) The original ground motion is decomposed with wavelet packet for three layers and the wavelet packet component of each frequency band is regarded as the new seismic acceleration record. Structural damage is concentrated in the first frequency band, the second is the second frequency band, a small amount of damage occurred in the four and third frequency bands, and no damage is occurred in the last four wavelet packet component. This is consistent with the distribution law of the wavelet energy of the structure vibration signal.(5) With the increase of the structural damage, the wavelet energy is more concentrated in low frequency band and tends to be saturated. The structure has been instability at this time. The change of ratio of the first frequency band wavelet energy to the total energy is used to estimate the overall damage index of the structure under rare earthquake, which can describe the overall damage of the structure.