Time history analysis of downwind vibration response of high-rise buildings

pulsating wind pressure;  spectral density function;  Acceleration

The harmonic superposition method is used to simulate the downwind pulsating wind pressure acting on the structure, and in order to reflect the relevant characteristics of the pulsating wind pressure acting on different points on the windward surface, the pulsating wind velocity mutual spectral density matrix is first generated, and then the triangulation decomposition method is used to decompose, and then the pulsating wind pressure is generated as the input pulsating wind load, and the dynamic response time history of the structure is calculated by Newmark method. The calculation results of the wind vibration reaction time history of the two high-rise buildings show that the root mean square value of the structural dynamic response obtained by this method is in good agreement with the spectral analysis results used in the building structural load code. The wind vibration reaction is mainly resonant reaction, and the non-resonance reaction value accounts for the secondary part. This is also consistent with the conclusion reached by the spectral analysis method, which shows the accuracy of using the harmonic superposition method to simulate the time history of pulsating wind pressure. This is of great significance for correctly estimating the wind vibration response value of the structure and providing a reference for the design of wind vibration control measures for high-rise buildings.