Expert: Jeanette A - 10/8/2008

Question
Does the size of the base of a skyscraper affect its stability under the influence of earthquake vibrations?

Answer
The physics of skyscrapers is an important area of study in engineering.

It is essential that the base has a greater combined mass than the above portion of the skyscraper in order that it support the building’s mass.

Another important aspect entailed in the building of a skyscraper is Newton’s second law: F = ma (or ‘force’ is equal to ‘mass’ times ‘acceleration’). This can be directly applied to the building of skyscrapers in that they must be built to withstand earthquakes or other disturbances. Especially in earthquake-prone areas, civil engineers are very mindful to ground acceleration. With such an immense mass as that of a skyscraper, the slightest ground acceleration results in a huge amount of force acting upon the building, diminishing its stability and often causing disaster.

Hope this answers your question.

Warm Regards,
Jeanette