X.-Y. Zhou’s scientific contributions

According to Taylor's Frozen Assumption about turbulence, an analytical solution of spectral density function of pressure fluctuation in across-wind direction was derived from the governing equation of flow movement in turbulence theory. All of the turbulence-mean components in the source term of pressure governing equation had been taken into account. If an appropriate turbulence integral scale is adopted, the spectrum density function value will correspond well to the results from full scale measurements. The function value near the basic natural frequency of building is larger than that from wind tunnel test. The displacement and the acceleration value evaluated with this fluctuating pressure load are larger than those from Japanese design code.

The research of the performance-based seismic design is now in the ascendant, and the pushover analysis as one main analytical method of the performance-based seismic design has been studied extensively. The lateral load pattern is one key problem of the pushover analysis, so the analysis and comparison of many different lateral load patterns are necessary. In this paper, many different lateral load patterns derived by former scholars are summarized, and at the same time, one new instantaneous adaptive lateral load pattern is developed. Finally, the applied scope, the validity and the effect of many different lateral load patterns used in the structural plastic analysis are compared through the analysis of two examples.

In order to observe the influence of the random noise of wind velocity, by using a real high-rise building example of wind-structure interaction analysis based on ANSYS, the dynamic response of the high-rise building under the artificial time history of wind velocity is simulated according to power spectra with and without random components and. The comparison of the analytical results shows that the dynamic response of the high-rise building has been enlarged to certain degree if the random components of the input power spectra of wind are considered.

An analytical solution to spectral density function of across-wind load fluctuation acting on the structure flank is presented from the original fluid movement equation in turbulence theory under certain assumptions. The spectral density function of wind load fluctuation could be derived from the CFD wind average velocity and fluctuating velocity distribution according to Taylor's Frozen Assumption of turbulence. All the T-M contributions have been taken into account in the analysis process. This could be regarded as an effective verification of the datum from wind tunnel test and datum from full scale observation. The analysis of structure dynamic response induced by this kind of wind load fluctuation could then be achieved without the expensive wind tunnel test.

Data from full-scale building tests conducted in Texas Tech University are used to quantify the uncertainties associated with the use of computational fluid dynamics to obtain wind load predictions for full-scale structures. It is demonstrated that the effects of computational domain is relatively small, and the effects of grid arrangement, turbulence model and inlet boundary condition are relatively obvious. Finally, guidelines are suggested for reasonable design and suitable choice of turbulence model.