In a post a few weeks ago I linked to a humbling video of high-rise buildings in Tokyo swaying after the 9.0 quake. Fortunately, the district, home to many office buildings and Brazil’s prized Municipal Theater, was pretty desolate due to the late hour of the collapse. ... A modal impact test of the building showed a natural frequency at the same 700 cpm frequency, confirming the presence of a resonant condition. Outline.
The Tacoma Narrows Bridge is famous for collapsing in a spectacular fashion during a windstorm. Authorities suggested that illegal construction work had weakened the 20-story building and caused it to fragment, which triggered a chain reaction and brought down the two smaller buildings. How to Diagnose and Prevent Resonance. V-shape floor collapse: This collapse occurs when lower walls or floor joists fail due to heavy loads located in the center of the floor. That video was only the beginning; below are many more that capture the dramatic oscillation of the towering steel edifices. In order to design buildings (and other human-made structures) to be able to withstand the forces of earthquakes and windstorms, structural engineers compute the natural frequency of buildings. 4.Buildings collapse due to earth quake why? By: Grant Slinger - Mechanical Engineer II. Brief Analysis Message claims that a series of attached images show a 13 story apartment building that toppled over in China due to major construction errors. For example, if the frequency of the seismic waves matches the natural frequency of a building, resonance occurs and structure fails. It results in two voids, one near each exterior wall. Ask for details ; Follow Report by Rajam4333 13 minutes ago Log in to add a comment Well, those buildings were full of tens of thousands of people, plenty of whom had cameras. Because the message does not include a date, many recipients assume that the building collapse was a recent event. June 7th, 2016. Versions of the message have circulated ever since.
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