Greenhouse Load

According to the nature of the load, the loads acting directly on the greenhouse structure are divided into three categories: permanent load, permissible load and accidental load.
(I) Permanent load, also called dead load, refers to a load whose value does not change with time during the use of the structure, or its change is negligible compared with the average value, or its change is monotonous and can approach the limit, such as The self-weight of the greenhouse and greenhouse structure, the self-weight of the transparent covering material of the greenhouse, the self-weight of various ancillary equipment installed on the greenhouse structure (including permanent equipment such as heating, cooling, sunshade irrigation, ventilation, light supplement, etc.), earth pressure, and water pressure , prestressed, etc.
(2) Variable load, also called live load, refers to the load whose value changes with time during the use of the structure, and its change cannot be ignored compared with the average value. It mainly includes wind load, snow load, crop load, and floor activity. Loads, roof live loads and dust loads, vertical concentrated loads (staff maintenance loads), loads of mobile equipment installed on structural members (indoor cranes, roof cleaning equipment, etc.)
3) Accidental load refers to a load that may not necessarily occur during the use of the structure. Once it occurs, its value is very large and its duration is short, such as explosion force, impact force, earthquake force, etc.