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Long distance earthquake and their effect on tall buildings |
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More Info:
Lessons from recent earthquakes
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The waves generated due to release of strain energy after an earthquake underneath the ground are of different frequencies. The high frequency waves attenuates (decay) faster before they reach to long areas. The short frequency or so called long period waves when reaches to long distant areas are more important for design of flexibility characteristics. The high rise buildings are very vulnerable to such waves since the natural frequency of such high rise buildings often remain close to the dominating long period waves causing amplification (resonance) of ground motion. However buildings that are designed for such ground motion does sway but within their elastic margin without any collapse. However short or low-rise buildings often escape damage under such conditions. The structural engineers should consider such specific requirements for design of high rise buildings. |
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