Abstract:

Under the fluctuating wind load,the wind-induced vibration response of the single-layer reticulated shell structures is different from that of tall buildings,because the main mode contributory to the dynamic response is usually not the 1st vibration mode,but the combination of the first tens of modes. Hence,it is necessary to find the contributory modes to the response. In this paper,the quasi-mode method considering the resonance response of the high modes is used to analyze the wind-induced vibration response of single-layer cylindrical reticulated shells,the effects of such factors as the self-vibration frequency and the damp ratio on the resonance response are investigated,and the vibration mode number needed for calculating the quasi-mode is discussed. The results show that the mode
cross-correlation must be taken into consideration because the self-vibration frequencies are very close to one ano-ther. Moreover,the factors to influence the mode cross-correlation and the vibration mode number needed for calcu-lating the cross-correlation are presented,followed by the wind-induced vibration coefficients of the displacement and the axial force for a practical single-layer cylindrical reticulated shell.

Key words: cylindrical reticulated shell structure, background response, resonance response, quasi-mode, mode cross-correlation