Ambient Vibration Measurement and Earthquake Resistant Behavior Analysis on a Two-Tower Tall Building with Enlarged Base

Abstract eng:
The twotower building with enlarged base is a highrise building form favored by the architect. In this paper the ambient vibration measurement was conducted on a 86metershigh framewall tall building. This building consists of two towers connected by air corridors and an enlarged base. Translational and torsional modes are measured. SATWE module in PKPM software is used to model the structure and the analytical modes are calculated. It is found that due to the eccentricity of the air corridors, each mode shape in the structure has component of torsional vibration, and the higher modes are all torsional modes. In comparison with the experiential formulas used in calculating fundamental period of tall building in different country, it is found that the measured fundamental period of the structure is higher than the results by calculation. It shows that the measured stiffness of the structure is higher than that of the analytical model. At last the designed ground motions are used in the elastic dynamic time history analysis by using Newmarkb method, and the results show that the response forces concentrate on the transfer story and the highest air corridor on the top of the tower, and the shear forces have greatly changed. Due to the connection of the air corridor, the bending moments and lateral displacements are approximately equal to each other in X and Y direction.

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