## 4 Analysis of Shape Factor of Wind Load
### Comparison of Shape Factors of Wind Load for Different Sizes
#### 4.3.1 North Wall and Rear Roof  
(1) At a wind angle of 0\({}^{\circ}\), the shape factors of wind load for all divisions of the northern wall of the solar greenhouses display positive values, as shown in Table 2. Principally, the shape factors of wind load across different partitions of the northern wall display varying responses to the size of the greenhouse. In particular, the shape factors of wind load in regions B1 and B5 exhibit a tendency to initially increase and subsequently decrease with an increase in size. Markedly, for the solar greenhouse with a 10 m span, regions B1 and B5 on the northern wall yield the highest shape factor of wind load, approximately reaching a peak value of 0.23.  
At an 8 m span, the shape factors of wind load within the B1 and B5 regions are observed to be smaller than those at a 10 m span. Conversely, when the size falls within the range of 12 m to 16 m, the shape factors of wind load of the B1 and B5 regions exhibit reductions relative to the 10 m span, ranging from 0.02 to 0.09. Furthermore, the shape factors of wind load across the B3 to B4 regions increase as the size extends. Remarkably, the wind pressure coefficients in the B3 region at a 16 m span reach their maximum, with a value of approximately 0.72. Compared to a 16 m span, spans ranging from 8 m to 14 m result in a substantial reduction in the shape factors within the B2 to B4 region, ranging from 2% to 14%.  
The shape factor of wind load values on the rear roof partitions of greenhouses with five sizes are observed to be negative and are in proximity to 0. Specifically, at a span of 14 m, the shape factors of wind load within the H2 to H5 region demonstrate the most significant values among the five distinct sizes. Furthermore, shape factor of wind load values reach their minimum in each region at the 10 m span, with the lowest recorded value occurring in the H1 region, approximately \(-\)0.19.  
(2) At a wind angle of 180\({}^{\circ}\), the shape factor of wind load for the northern wall and rear roof is observed to be negative, as shown in Table 2. The absolute magnitude of the shape factor of wind load within the B3 zone of the northern wall increases with the size, reaching a peak value of 0.36 when the span extends to 16 m. This value was notably larger by 0.02-0.04 compared to the other four size variations. In contrast, for the 14 m span, the absolute magnitude of the shape factor in the remaining regions ranges from 0.39 to 0.40, representing the smallest values.  
The size exhibits minimal influence on the shape factor of wind load in the rear roof region. However, for the regions on both sides of the rear roof (H1, H2, H4, and H5), the  
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{**Wind**} & \multicolumn{1}{c}{**Span (m)**} & \multicolumn{1}{c}{**B1**} & \multicolumn{1}{c}{**B2**} & \multicolumn{1}{c}{**B3**} & \multicolumn{1}{c}{**B4**} & \multicolumn{1}{c}{**B5**} & \multicolumn{1}{c}{**H1**} & \multicolumn{1}{c}{**H2**} & \multicolumn{1}{c}{**H3**} & \multicolumn{1}{c}{**H4**} & \multicolumn{1}{c}{**H5**} \\ \hline \multirow{6}{*}{0\({}^{\circ}\)} & 8 & 0.20 & 0.55 & 0.63 & 0.54 & 0.22 & \(-\)0.16 & \(-\)0.11 & \(-\)0.09 & \(-\)0.16 & \(-\)0.17 \\  & 10 & 0.23 & 0.57 & 0.65 & 0.57 & 0.22 & \(-\)0.18 & \(-\)0.17 & \(-\)0.14 & \(-\)0.14 & \(-absolute value of the shape factor of wind load decreases as the size extends. Comparing the shape factor of the 16 m span to that of the 8 m span, it undergoes a change from \(-0.55\) to \(-0.43\).