## 3 Results and Discussion  
### Wind Pressure Coefficients  
The wind pressure coefficients of the CAARC standard model serve as a benchmark for wind load testing in high-rise building wind tunnel laboratories and are commonly used to assess the reliability of wind tunnel experiments. The calculation process for the mean wind pressure coefficient (\(\mathrm{C_{p,mean}}\)) and RMS wind pressure coefficient (\(\mathrm{C_{p,rms}}\)) are given by Equations (3) and (4), respectively. Figure 3 presents the experimental results of the mean wind pressure coefficient at each measurement point at a height of 2/3 H, for wind directions \(\beta\) of 0\({}^{\circ}\) and 90\({}^{\circ}\), respectively. Although more results were collected for different wind angles, this study mainly focuses on the direct differences between the two wind tunnel laboratories. Therefore, only the results for the typical wind angles of 0\({}^{\circ}\) and 90\({}^{\circ}\) are selected for analysis. The shaded region in Figure 3 represents the range of experimental results reported by researchers [7]. It can be observed that the mean wind pressure coefficients obtained from CQU exhibit some differences compared to the results obtained from HIT. At the wind direction angle of 0\({}^{\circ}\), the mean error at each measurement point is approximately 13%, and at the wind direction angle of 90\({}^{\circ}\), the mean error at each measurement point is approximately 11%. Compared to the results of the literature, it can be seen that the results of CQU are slightly lower on the windward face, while the results of HIT are in good agreement. For pressure measurement experiments, the reference static pressure is typically defined as the average static pressure of undisturbed wind at the top of the test building. It is a critical parameter for the accuracy of wind tunnel test results. Inaccurate measurement of the reference static pressure can result in global errors in the pressure measurements at all test points. In the conventional tests, in order to avoid disturbing the flow field near the model, the pitot tube for measuring total pressure and static pressure is generally placed slightly away from the model, as shown in Figure 4, where P1 represents the location of the pitot tube. In an open-circuit wind tunnel, the pressure drop can cause a difference between the measured static pressure and the actual static pressure at the location of the model, which may cause the lower value obtained by CQU on the windward face. Therefore, it is necessary to correct the difference in static pressure to obtain an accurate reference static pressure at the location of the model and further adjust the results of the average wind pressure coefficients. This issue is similar to the research by [PERSON] [21], who proposed an indirect measurement method to obtain accurate reference static pressure in wind tunnel  
Figure 3: Mean pressure coefficients for the considered CAARC models: (**a**) in the 0\({}^{\circ}\) direction; (**b**) in the 90\({}^{\circ}\) direction. experiments. The method involves measuring the relationship between the reference static pressure difference at the model location and the actual location as a function of wind speed. The measured difference is then used to calibrate the existing reference static pressure data, thereby refining the results of the mean wind pressure coefficient. The following section presents the correction of the error in the reference static pressure at the CQU wind tunnel laboratory. The correction results will be shown in Section 3.2. Figure 5 presents the RMS pressure coefficients at 2/3 H for the considered CAARC models in the 0\({}^{\circ}\) and 90\({}^{\circ}\) directions. The results indicate that the RMS wind pressure coefficient in the wind tunnel laboratory at CQU (Chongqing University) is generally lower than that in the wind tunnel laboratory at HIT (Harbin Institute of Technology), particularly on the windward and lateral sides.