## 3 Rigid Model Pressure Measurement Test
### Test Results and Analysis  
The mean wind pressure coefficient of each measuring point on the roof can be calculated by Equation (13), and the contour map of the coefficients on the roof can be drawn, which can reflect the overall wind pressure distribution and law on the roof surface. Due to the large number of test conditions and the huge amount of data, only the results under 6 characteristic wind direction angles are selected for display, as shown in Figure 5.  
According to Figure 5, it can be found that: (1) The flow separation phenomenon will occur at the edge of the roof, and the negative inclination angle delays the reattachment phenomenon, so that under the action of any wind direction angle, the mean wind pressure  
Figure 5: The contour map of the mean wind pressure on the roof under the characteristic wind direction angle: (**a**) 0\({}^{\circ}\) wind direction angle; (**b**) 45\({}^{\circ}\) wind direction angle; (**c**) 90\({}^{\circ}\) wind direction angle; (**d**) 135\({}^{\circ}\) wind direction angle; (**e**) 180\({}^{\circ}\) wind direction angle; (**f**) 270\({}^{\circ}\) wind direction angle.  
coefficients of the roof are mainly negative. The mean wind pressure coefficients of the folded plate surface with a negative inclination angle are all negative in the downwind, while the coefficients of the folded plate surface with a positive inclination angle have positive values in some areas, but the positive pressure value is very small, that is, the roof is mainly subjected to upward lift under different wind direction angles. (2) The leading edge of the roof in the direction of the incoming flow and the position where the structural form changes abruptly will greatly disturb the incoming flow, causing the flow direction to change abruptly, resulting in a clear distinction of the intensity of the contour map. The mean wind pressure coefficients around the openings on both sides of the roof and at the edge of the roof varies greatly. (3) The structural forms which the incoming flow run through are inconsistent, which makes the mean wind pressure coefficients at any point change greatly under different wind direction angles. In addition, due to the existence of characteristic buildings around the station and the inconsistency of the heights of platforms and canopies on both sides of the station, the wind pressure results under the conditions of symmetrical wind direction angles do not show strict axis symmetry.  
For the structural wind pressure measurement test and results in this section, we need to make the following descriptions. Firstly, each group of measurements was performed twice, and the next test was only continued after ensuring that the data were correct. Secondly, in the research of this paper, a number of typical measuring points in different zones were selected to conduct a systematic study, which effectively avoided the occasionally of analysis. Even so, there were inevitably some errors in the results due to the influence of experimental techniques and other factors. In order to make the evaluation of the wind pressure field on the roof surface more precise, more measuring points were often selected in the test. Unfortunately, due to the limited measurement channels on current pressure acquisition devices, multiple acquisitions had to be performed. This made the wind pressure of each measuring point on the roof unable to be collected synchronously, which brought certain errors to the wind pressure field evaluation and reconstruction analysis. In addition, due to the large size of the structure and model, the pressure measuring pipeline was long in the test. Many studies showed that the long pressure measuring pipeline causes a little loss of the actual fluctuating wind pressure on the roof surface and causes errors. In view of the above problems, on the basis of limited equipment conditions, it is necessary to further analyze the importance of each error influencing factor and weigh and select a more reasonable test plan.