What Is Seismic Design?

Aseismatic design emphasizes the "calculation design" and focuses on the overall structure. It has a leading role in seismic design and strengthens the structure in terms of stiffness, strength, ductility, and axial compression ratio. Concept design.

Aseismic design, a special design for engineering structures located in earthquake zones to meet the comprehensive requirements of engineering structure safety and economy under earthquakes, generally including two aspects of seismic analysis and seismic measures. Seismic analysis refers to the calculation and analysis of the response of a structure to ground motion based on structural dynamics. Anti-seismic measures include the overall layout of the project, structural selection, foundation treatment, and various structural measures. ^[1]

In many countries, new structures have emerged in the seismic design of high-rise buildings. For example, 42-storey high-rise buildings in New York, USA, are built on 98 rubber springs with separated foundations, and Japan is built on curved steel bars to prevent earthquakes. Buildings, buildings in the former Soviet Union built on separate sand cushions, and rigid, flexible, vibration-damped, shock-absorbing building structures and earthquake-resistant structures in China that have obtained patent rights in the United States, China, and the United Kingdom The low-rise building plus storey structure has been successfully applied in engineering practice, and all of them have obviously changed the structure system of the traditional plug-in rigid hoop to bundle internal forces (absorbing seismic energy) in the building structure. In short, in terms of the structure of the building design, we try to get rid of the structural system of the inserted rigid hoop that is a serious threat to people's lives during the earthquake disaster. In essence, they all reflect the shake of the current earthquake-resistant hard and dead-resistant design code for earthquakes, which is based on the guiding theory of "Earth-like Earth is a fairly good inertial reference frame." It also essentially changes the structure's mechanical system, It is no longer inertial reference frame that seems to be absolutely stationary.

Flexible building. Japan has built 12 flexible buildings in Tokyo, which have been tested by the magnitude 6.6 earthquake on the Richter scale, with significant disaster reduction effects. This kind of elastic building is built on the insulation body, which is composed of layered rubber, hard steel plate group and damper, and the building structure does not directly contact the ground. The damper is made of spiral steel plate, which can reduce the bumps up and down. Rolling Ball Building An electronic factory building was built in Silicon Valley, USA. A new method of earthquake resistance is to install stainless steel balls under each pillar or wall of the building. The ball is used to support the entire building. The criss-crossing steel beams hold the building tightly to the ground. The ground is fixed. When an earthquake occurs, the elastic steel beams will expand and contract automatically, so the building's slight sliding back and forth on the balls can greatly reduce the destructive force of the earthquake. Spring Building Japan's Kashima Construction Department invented a new method for building earthquake-resistant buildings: the spring separates the foundation part connected to the foundation from the main body of the building, so that the main body of the building is in an intermediary that can absorb earthquakes and other vibration shocks On the thing. No matter how the foundation is shaken, the vibration energy will be reduced to 1/10 of the original when it is transmitted to such a building. ^[3]

Overall, China has done a good job in seismic laws and regulations and national standards. China has issued national standards such as "Classification Standards for Seismic Fortification of Construction Engineering" and "Administrative Regulations on Urban Seismic Disaster Prevention Planning", which specifically divides the classification, responsibilities, and disaster prevention planning of buildings against earthquakes. Article 8 of the Administrative Regulations on Urban Earthquake Disaster Prevention and Planning stipulates that: when subjected to frequent earthquakes, the city's general functions are normal; when subjected to earthquakes equivalent to the seismic fortification intensity, the city's general functions and lifeline systems are basically normal. Normal or soon resume production; when suffering rare earthquakes, the city's functions will not be paralyzed, critical systems and lifeline projects will not be severely damaged, and serious secondary disasters will not occur.