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## 4Wind Pressure and Forces on Buildings and Other Structures

### 4.1 Introduction to Wind Pressure

#### Definition and Units

The pressure on a surface is the force exerted on the surface per unit area, in a direction perpendicular to the surface. Due to the use of ambient pressure as the reference pressure in wind engineering, the pressure on a surface may be either positive (above ambient) or negative (below ambient). A positive pressure is regarded to act toward the surface, whereas a negative pressure is regarded to act away from the surface. A negative pressure is called a suction. Some units of pressure often used are psi (pounds per square inch), dynes per square centimeter, newtons per square meter (pascals), and so on. Due to the relative smallness ...

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