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Introducing the retrofit of viscous damper for reinforcement
Published:2022-10-20 16:27:22 Browse: time
Introducing the retrofit of viscous damper for reinforcement
 
introduces viscous dampers as a new technology of seismic strengthening of structures, and illustrates the feasibility and reliability of viscous dampers used in strengthening projects through examples. With the acceleration of the urbanization process in China, more and more old buildings are facing the problem of reinforcement and transformation while various new buildings with beautiful forms and complete functions are emerging. On the one hand, a large number of industrial and civil buildings built in the 1950s and 1960s in China have entered the over age period; On the other hand, due to low design specifications, construction and management issues, a large number of projects built in the early stage have many potential safety hazards. According to statistics, more than 40% of the existing buildings with an area of more than 6 billion m2 in China need to be tested, evaluated, reconstructed and reinforced by stages and batches. Therefore, the wind resistance and seismic reinforcement of existing buildings has become one of the important problems to be solved in structural engineering
 
The traditional strengthening methods of structures achieve their goals by enhancing the strength and stiffness of the structure itself, such as the method of enlarging the section, the method of outsourcing shaped steel, the method of prestressing, the method of adding supporting points, the method of bonding steel, the method of carbon fiber reinforcement, the method of adding structural columns and ring beams, and the method of adding seismic walls. Although these methods have achieved certain results in a large number of engineering practices, there are still a series of problems, such as adding anti-seismic walls will increase the self weight of the structure, so the bearing capacity of the foundation should be considered. When the bearing capacity is exceeded, the foundation should also be reinforced, making the construction cycle long and the cost high; Some reinforcement methods (such as adding structural columns and ring beams) may affect the beauty or use space of the building, which is extremely undesirable for historical buildings; The reconstructed buildings are generally subject to adverse seismic factors such as rigid upper and flexible lower, head weight and foot weight. In view of the above shortcomings, domestic and foreign engineering designers and researchers gradually turn to the use of viscous damper energy dissipation control technology as a new method of structural strengthening, and have carried out a lot of research
 
Viscous damper energy dissipation and vibration reduction strengthening technology absorbs the seismic energy of the input structure by setting energy dissipators in some parts of the structure, which changes the disadvantage of traditional strengthening methods that energy is dissipated only by sacrificing structural members, and realizes the principle of multi defense of building structures in a real sense. There are many types of energy consumers, and their characteristics are different