In the face of natural disasters, human beings are too small to compete with them.
Earthquakes are one of the serious natural disasters that human society is facing. They are extremely destructive. The Tangshan and Wenchuan earthquakes are shocking up to now. The current level of science and technology can not predict the arrival of earthquakes, and for a long time in the future, earthquakes are also unpredictable. The so-called examples of successful earthquake prediction are basically coincidences. For earthquakes, we should do more to improve the seismic grade of buildings and do a good job of defense, rather than predict earthquakes.
1. 1976 Tangshan Earthquake
On July 28, 1976, at 3:42:53.8 seconds, an earthquake of magnitude 7.8 (magnitude 7.5) occurred in Fengnan, Tangshan, Hebei Province, China. The epicenter intensity was 11 degrees, the focal depth was 12 km, and the earthquake lasted about 23 seconds.
The earthquake caused 242769 deaths and 164851 serious injuries ranked second in the world earthquake history in the 20th century, after the Haiyuan earthquake.
2. 2008 Wenchuan Earthquake
On May 12, 2008, Sichuan Province in southwestern China was hit by a magnitude 7.9 earthquake.
Nearly 70,000 people were killed, more than 10 million people were homeless and property losses exceeded $86 billion.
3. Japan Tsunami
March 11, 2011, 13:46 (Beijing time 13:46) occurred in the western Pacific international waters of the Richter 9.0 earthquake, 12 Dudao Prefecture in Japan confirmed the number of victims 11232, the police received reports of 16,361 missing families, a total of 27,593 people.
4. A magnitude 6.1 earthquake struck northern Osaka on Monday (18), causing many casualties.
The hazards of earthquakes are by no means alarmist.
First, the earthquake caused the collapse of the building foundation and the liquefaction of sand loss, which made the foundation invalid.
Secondly, the earthquake caused serious deformation of the whole ground and caused the center of gravity of the building to shift and collapse as a whole.
Thirdly, due to the violent vibration of the structure due to movement, excessive deformation, joint failure, structural strength is insufficient, resulting in component instability or even overturning.
The final result is: the collapse and damage of the building, resulting in casualties.
The latest generation of light steel structure houses make buildings safer and safer to live in.
Because of the light weight of light steel structures, the properties of metal materials and the necessary form of shear wall structure determine the inherent seismic performance of light steel structures.
Because the seismic activity is left and right and up and down, the light steel structure connected with fasteners constitutes a safe and stable box, which will not cause wall collapse or floor fall because of the earthquake shaking, endangering personal safety. When the earthquake intensity is 9, it can meet the requirement of non-collapse and is extremely safe.
Historic Development of Light Steel Housing
Light steel houses have been introduced into China as early as the 1980s, but limited by economic conditions, they have not been widely popularized, only in public buildings, high-grade villas and other projects.
Nowadays, with the development of manufacturing industry and the continuous expansion of market scale in China, the price of steel products has been lowered, and the cost of light steel houses has been reduced. At present, the cost of light steel houses is cheaper than that of brick-concrete structures, which is totally accepted by the general public.
At present, there is no accurate earthquake early warning in the world in the short term. Instead of leaving our lives to the uncertainty of the future, we might as well build a light steel villa that can resist earthquakes and prevent accidents in the near future.