An 8.1 magnitude earthquake struck Nepal, killing more than two thousand people. In the past few years, China has also experienced a number of earthquakes, causing a large number of casualties. From Wenchuan to Ya 'an and Min County Ludian, the statistics show that among the earthquakes that occur in our country, most of them happen in the rural areas. In its path, the earthquake destroyed buildings and caused a large number of casualties. This is because in rural areas, the building is "brick mixed civil structure mainly", the seismic performance is poor.
So what kind of buildings have better seismic performance.
Steel structure building, it has a very excellent seismic performance. The seismic performance of different structural forms is obviously different. Concrete houses are better at compression, but not tensile, with a 10-fold difference between the two forces. When the earthquake comes, the whole collapse of the building is easy to happen under the condition of seismic wave cyclic load. The steel structure has good ductility and can offset the energy consumption of seismic waves. Steel is basically isotropic material, tensile, compressive and shear strength are very high, and has good ductility, especially the steel structure with its own unique high ductility to reduce the earthquake response. Steel structure can also be regarded as an ideal elastic-plastic structure, which can absorb and consume the input energy of earthquake through the plastic deformation of the structure, so that it has a high ability to resist strong earthquakes. The steel structure is relatively light compared with other structures, which greatly reduces the impact of earthquake.
When the earthquake hit Wenchuan in Sichuan province, a large number of houses collapsed, but only the steel structure of Mianyang Gymnasium was unharmed. Data after the Hanshin earthquake in Japan show that the damage rate of steel structures is much lower than that of concrete structures. Both theoretically and structurally, steel structure buildings are superior to other structural systems.
According to Liu Xingyuan, chairman of Sichuan Metal Structure Industry Association, in Chengdu, many Japanese rent office buildings, the first requirement is steel structure. They believe that the premise of work is to ensure the safety of life. After the "5·12" Wenchuan earthquake, the people of Chengdu understood a simple truth: the house does not fall down, no death; When the house falls down, there are no undead. At present, the seismic performance and safety of steel structure buildings have been recognized in Chengdu.
Japan is more earthquake-prone, steel structure of the building in Japan occupies about 65%. According to the chief engineer of Baosteel Steel Structure Co., LTD., more than 20 years ago, when he was a student in Japan, he rushed out of his house and immediately found that all Japanese except him were still working on schedule. The tutor told him that since Japan is prone to earthquakes, there are strict regulations on the anti-seismic performance of buildings. In the case of a certain level of earthquake, the buildings should not fall down. Because of this, a large proportion of steel buildings in Japan are earthquake-resistant and people do not panic when an earthquake occurs.
In China, although the steel structure building has been gradually recognized by the government departments, developers, designers, users and other relevant aspects, the steel structure housing, as one of the steel structure buildings, has far less market share than the traditional concrete housing. Some experts believe that the construction of sports venues, airports and other public buildings to select the steel structure has become a choice, the steel structure housing as a public building applications and developers need to gain greater economic benefits in the short term goal, as the government policy developed, people awareness of steel structure residence is higher and higher, the situation will gradually improve.
