Mathematical model of torsional fluctuating wind force on rectangular super-tall buildings

作者：Tang Yi^*; Gu Ming; Quan Yong

来源：Journal of Building Structures, 2009, 30(5): 198-204.

• Coherent function
• Correlation coefficient
• Fluctuating torque
• Fluctuating wind
• Measured data
• Nonlinear least-squares method
• Power spectrum density
• Rectangular super-tall building
• Response spectra
• Side ratio
• Torsion loads
• Torsion moments
• Torsion response
• Wind pressures
• Wind tunnel tests

In this paper, mathematical model of fluctuating torques acting on rectangular super-tall buildings were investigated based on wind tunnel test results. Using the nonlinear least-squares method, formulas of the RMS torsion moment coefficient, vertical torsion moment correlation coefficient, power spectrum density(PSD) of torsion moment and coherent function between crosswind base moment and base torques were fitted as the functions of side ratio of building cross-section and terrain category condition. Precision of the formulas was verified by comparing the measured data from wind tunnel test and calculated results. Furthermore, dynamic torsion responses of a real super-tall building were respectively computed by using the present formulas and by directly using the wind pressure data from the wind tunnel test. Results from the two different methods, including general torsion loads, response spectra and RMS values, match well, which could verify applicability of the present formulas.

• 出版日期2009
• 单位同济大学