Fatigue damage assessment methods (including the time domain method and frequency domain method) are the critical content of structural durability design, and thus the improvement of their accuracy and efficiency has important engineering significance. Compared with the time domain method, the frequency domain method is simple and efficient in calculation, but its accuracy is lower. Based on the spectrum method proposed by Tovo-Benasciutti (T-B spectrum method) and wind-induced fatigue damage evaluation of tall buildings, an improved T-B spectrum method in conjunction with the envelope value of its key parameter is developed in this paper. Firstly, the original two T-B spectrum methods are evaluated by taking the wind-induced fatigue caused by alongwind, crosswind and their coupled responses of tall buildings into consideration, where the rain-flow counting method is regarded as reference model. Then, based on the analysis results of the key parameter, the envelope value of this parameter is given by numerical simulation. Finally, an improved T-B spectrum method is developed by this envelope value, and its validity is verified. The result shows that with the increase of slope parameter of material fatigue curve (i.e., the parameter m in S-N curve), the errors between rain-flow counting method and the original T-B spectrum methods augment gradually; the improved method has higher accuracy in comparison with the original T-B spectrum methods. Taking the results of crosswind fatigue response (m=3) as an example, the reductions by the improved method in terms of the average errors are 77.49% and 55.38%, respectively.
Key words
Structural engineering /
Fatigue damage /
Numerical simulation /
T-B spectrum method /
Rain-flow counting method
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