The building shook not because of the earthquake. SEG Building is located in Huaqiang North Business Circle, Futian, Shenzhen. It was a skyscraper built 2 1 years ago. Its height is 355.8 meters, which is more than 30 meters higher than the most famous Eiffel Tower in France. It is a traditional landmark building in Shenzhen. After the first obvious shaking of SEG Building in May 18, the speculation about the cause of the shaking has not stopped, but it is generally believed that the most likely factors are earthquake and wind blowing. However, after investigation by the Emergency Management Bureau, it was found that there was no earthquake in Shenzhen that day, and there were no cracks and cracks on the ground around the SEG Building, and there was no shaking in other buildings, indicating that the shaking of the building was not caused by the earthquake.
The SEG building can withstand a magnitude 7 earthquake. In fact, even if there is a small earthquake, it will not have any impact on the SEG building, because the SEG building used a relatively strong concrete-filled steel tube structure at that time, and its safety is still very high now, which can resist the earthquake of magnitude 7. Ordinary earthquakes generally do not cause damage to its overall structure. This kind of concrete-filled steel tube structure is filled with concrete, which is much stronger than the reinforced concrete structure of ordinary buildings. The diameter of the large steel pipe in SEG Building is 1.6m, and the wall thickness is 2.8 cm, which has high strength. After the completion of SEG Building, it has also become the tallest concrete filled steel tube structure in the world.
Excluding the earthquake, it is untenable to say that buildings shake because of the wind, because the maximum instantaneous wind force in Shenzhen on that day was only 5, not counting strong winds, and high-rise buildings generally need typhoon level to be affected. Later, experts also tested the building settlement and internal and external structures of SEG Building, and found that the main structure of the building was safe, and all indicators met the requirements of the code, but no obvious factors leading to the building shaking were found. The preliminary conclusion of the expert group is that the shaking of SEG building is caused by the coupling of many factors, mainly the influence of wind blowing, temperature change on the building structure and the vibration caused by subway operation under the building. Of course, this is only a temporary conclusion, and the follow-up exploration will certainly find the fundamental factors, but the most important thing is what measures can be taken to truly stabilize the SEG building and fundamentally ensure the personal safety of the staff in the building. Some experts suggest that it is a better choice to install dampers in SEG building.