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Answer :
A wind combination is expressed as a combination of external and internal wind pressures. The external wind pressure represents the pressure exerted by the wind on the outer surfaces of the structure, while the internal wind pressure represents the pressure exerted by the wind inside the structure.
To determine the worst wind combination, we need to consider the extreme values of the external and internal wind pressures.
From question:
External wind pressure: -3 kPa
Internal wind pressures: -0.5 kPa and 0.3 kPa
To find the worst combination, we'll consider the combination that results in the highest overall wind pressure on the roof.
Combination 1: O 3.3 kPa
In this combination, the external wind pressure is -3 kPa, and there is no internal wind pressure contribution. Therefore, the overall wind pressure is -3 kPa.
Combination 2: 2.5 kPa
In this combination, the external wind pressure is -3 kPa, and there is no internal wind pressure contribution. Therefore, the overall wind pressure is -3 kPa.
Combination 3: O 3.2 kPa
In this combination, the external wind pressure is -3 kPa, and there is no internal wind pressure contribution. Therefore, the overall wind pressure is -3 kPa.
Combination 4: O 3.5 kPa
In this combination, the external wind pressure is -3 kPa, and there is no internal wind pressure contribution. Therefore, the overall wind pressure is -3 kPa.
Comparing all the combinations, the worst wind combination is any of them, as they all result in the same overall wind pressure of -3 kPa.
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