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🏙️ Why do tall buildings sway

Understand how height, wind, earthquakes, resonance, damping, and tuned mass dampers make tall buildings move safely.

4
lessons
~10 min
to learn
Adults
level
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What you’ll learn

  1. A tall building is a flexible structureExplain why height, flexibility, natural period, drift, and acceleration make sway noticeable.Tall towers deform dynamically, with larger upper-floor movement and comfort limits that matter alongside structural safety.
  2. Wind pushes and reshapes the responseConnect fluctuating wind pressure, vortex shedding, resonance, and aerodynamic form.Wind can drive organized motion, so tapering, twisting, setbacks, and rounded corners help interrupt the forcing.
  3. Earthquakes move the ground beneath the towerDescribe long-period shaking, drift, torsion, and damping in tall-building earthquake response.Earthquake waves interact with a tower's modes; damping and carefully designed systems reduce motion and protect function.
  4. Engineers tune the building's motionExplain how mass, stiffness, tuned dampers, and monitoring manage sway.Engineers tune the structure and its devices so a tall building can move within predicted strength and comfort limits.

Questions this course answers

Why does the top of a tall building usually move more than the base?

A flexible tower deforms continuously, with larger displacement toward the upper floors.

What does drift measure?

Interstory drift is the relative displacement of adjacent floors.

What is vortex shedding?

Vortices can alternate from opposite sides and create repeating aerodynamic forces.

How can tapering or twisting reduce sway?

Changing the outline interrupts coherent vortex formation and spreads wind forcing.

Which earthquake motion can affect tall buildings especially strongly?

Tall flexible buildings have longer natural periods and can respond to slower shaking.

What does damping do?

Damping dissipates energy so resonant motion builds less and fades faster.

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