What is true about Exposure D wind behavior?

What is true about Exposure D wind behavior?

• A. It experiences the lowest pressures due to sheltering.
• B. It experiences the highest pressures due to flat, unobstructed terrain.
• C. It has moderate pressures with occasional windbreaks.
• D. It behaves the same as Exposure B.

Answer: (B)

Exposure D wind behavior is defined by open, flat, unobstructed terrain that offers little to break up or shield the flow. In such environments, winds can reach higher peak speeds and maintain strength over a wider area, which drives the largest design wind pressures on the windward surfaces and greater suction on the leeward side. That’s why Exposure D is associated with the highest pressures among the exposure categories. In contrast, more sheltered or cluttered exposures (urban or rural with buildings, trees, or hills) disrupt the flow, reducing peak speeds and the resulting pressures, so they don’t reach the same levels as Exposure D.

Exposure D wind behavior is defined by open, flat, unobstructed terrain that offers little to break up or shield the flow. In such environments, winds can reach higher peak speeds and maintain strength over a wider area, which drives the largest design wind pressures on the windward surfaces and greater suction on the leeward side. That’s why Exposure D is associated with the highest pressures among the exposure categories. In contrast, more sheltered or cluttered exposures (urban or rural with buildings, trees, or hills) disrupt the flow, reducing peak speeds and the resulting pressures, so they don’t reach the same levels as Exposure D.