The term 'permanent load' refers to a load whose value does not change over time during the use of the structure, or whose variation is negligible compared to the average value, or whose variation is monotonic and can approach the limit value
2 Variable load is a load whose value changes over time during the use of a structure, and its variation cannot be ignored compared to the average value. Accidental load may not necessarily occur within the service life of the structural design, but once it occurs, it is a load with a large magnitude and a short duration. 4 representative values of a load are the load values used in the design to verify the limit state, such as standard values, combined values, cheek contact values, and quasi permanent values. The design reference period is the time parameter selected to determine the representative value of variable loads
6 Characteristic value/nominal value is the basic representative value of the load, which is the characteristic value of the statistical distribution of the maximum load during the design reference period (such as mean, crowd value, median, or a certain percentile value)
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