| AAC Advantages : Structural Integrity
Heart Craft Homes pass the Dade County, Florida's hurricane building code
requirements! Petra and Heart Craft buildings are designed to be some of the structurally strongest in the
world and naturally have a high "seismic rating" (earthquake resistance), and the highest rating when
optional earthquake package is added. TSUNEO OKADA Professor Institute of Industrial Science University
of Tokyo, Japan writes in his article "Codes We Don't Want to Crack - How Seismic Design and Building
Codes Have Helped Reduce the Damage Caused by Earthquakes": The Great Hanshin Earthquake on January 17
was a major seismic event, measuring 7.2 on the Richter scale of magnitude, 7 on the Japanese scale of
intensity, and XI on the MM (Modified Mercalli) scale used in the US. Not only was the Great Hanshin
Earthquake an inland type earthquake, but it occurred on an unmonitored fault located directly beneath
a major metropolis (Kobe) of 1.5 million inhabitants. Consequently, loss of life and property was enormous.
Over 160,000 buildings and houses were damaged in the Kobe earthquake.
More than 50,000 wooden houses
were completely destroyed. 90% of the approximately 5,500 people killed in the quake were crushed to
death in fallen buildings.
Two key features of the destruction were the fires caused by collapsing
wooden buildings and the extent of damage to reinforced concrete and steel-structure buildings
built 20 to 30 years ago, before implementation of the current Seismic Design Code. Along with
preventive measures taken before an earthquake occurs, measures to prevent secondary disasters
after the quake are also important. There are two important points. One is fire fighting. In the
Kobe disaster, water mains were broken and fire hydrants damaged. Without water, it took two full
days for the fires to be completely extinguished. (Note: Heart Craft Homes provide highest
seismic strength ratings and are fire proof!) Consequently, the development of an earthquake-resistant
water supply infrastructure is urgently needed . . .
After the Mexico City earthquake of 1985,
inspectors condemned a high-rise apartment building that had been damaged and the several hundred
occupants were forced to evacuate the premises. The building collapsed in an aftershock the next
day. In the wake of the Mexico City disaster, the important role of inspectors was recognized
in the US. California implemented an inspection system in 1989 and inspectors were mobilized in
the Loma Prieta earthquake that same year and the 1994 earthquake in Northridge, Los Angeles."
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