# Construction and Application of Safety Management Scenarios at Construction Sites
## 3 Results
### Analysis of Safety Management Scenario Elements in the First Phase of Main Structure Construction  
3.1 Construction Progress of the First Phase of the Main Structure Construction of the Production Base Project  
During the summer construction, the first stage of the main structure construction of the production base project was evaluated using an aerial photo (Figure 8). Evidently, the primary structure of Building No. 4 is finished, while Building No. 5's primary structure is 90% complete. Building No. 3 is presently in the foundation layer construction stage. Additionally, the main structure of the apron in the comprehensive Service Building No. 1 is complete, and the primary structure of the main building is 50% complete. Similarly, the primary structure of the apron in the comprehensive Service Building No. 2 is complete, and the main building's primary structure is 40% complete. The primary framework of the main building is fully constructed. In general, the majority of the site is currently in the main structure construction stage. Hence, when creating the scene model of the construction site, it is based on the aforementioned completed construction status. Additionally, the simulation parameters of the scene are set according to the summertime climate conditions mentioned in Table 2.  
3.2 Analysis of Natural Conditions for the Construction of Scenarios in the First Stage of the Main Structure Construction of the Production Base Project  
By conducting simulations of wind patterns at the main structures' initial construction site, we have generated an air flow diagram of the construction area (Figure 9). As the third plant currently remains in the foundation layer construction stage with the main body not yet reaching the interface of plus and minus zero, the wind field in the XY direction at the 1.5 m construction site still does not affect the third plant. Additionally, the wind field in the XY direction at the 19.4 m construction site does not involve the podium of Supporting Services Building Nos. 1 and 2. During the summer construction season, south-easterly winds are predominant at the worksite. As the wind advances, it encounters obstacles in the form of buildings, specifically Service Building Nos. 1 and 2. This scenario results in the airflow being redirected, generating a phenomenon known as a bypass. A portion of the airflow goes through the western side of Building 1, while another portion goes through the eastern side of Building 2. These two distinct airflows merge in the southern part of the worksite, resulting in the formation of a northeasterly wind that blows toward the southwest. Owing to the Supporting Services Building Nos. 1 and 2's main body being only half of the total height, as the winds encounter each other south of Plant No. 4 and east of Plant No. 5, a  
Figure 8: Aerial photo of the site during the main structure construction Stage I.  
roundabout flow is produced. Some of the airflow passes through the middle of the road between Plant Nos. 4 and 5 and on both sides, while the remaining airflow rises and returns toward the southwest direction. During summer, the construction site was subjected to simulations of high wind speeds. Within the region, Plant Nos. 4 and 5 were situated in the middle of the road, where wind speeds were considerably higher due to their location in the corner wind area. The highest wind speed recorded was over 6 m/s. In the same region, Plant No. 5 and Supporting Services Building No. 1 were positioned between the road and the south side of Building No. 1, where the wind speed was second highest. Owing to the main structure's height, the 3 rd plant is not situated in the area with higher wind speeds. However, the wind speed is lower in the wind shadow area, which includes the north side of Plant No. 4, the west side of Plant No. 5, the northern side of Building No. 2, and the podium in the middle of the main building area.