Authors: Snehal Sunil Sawant, Sunil Mane
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The effects of an earthquake can be very dangerous for structures under the influence of these forces. There are many traditional methods of protecting structures from the effects of earthquakes. But these methods have some disadvantages. Increasing strength and stiffness are just some of the traditional methods. However, they lead to higher cross sections and result in an uneconomical design. In order to overcome these disadvantages associated with the traditional method, a number of vibration control measures, called structure control, have been investigated and considerable progress has been made in recent years. The article describes the effect of using steel spacers, dampers and base insulation (lead rubber mounts) in a structure subjected to seismic motion. The structure is designed in ETAB, then the spacers, shock absorbers and base insulation are each applied to 3 different models and the results compared. Ground moving force or seismic force is applied to the structure using the seismic coefficient method. The isolated base structure offers better seismic resistance than traditional designs. The basic properties of the basic insulation system are insulation, energy dissipation and recovery mechanism. It has been shown that all basic isolators under design conditions can significantly reduce the acceleration transmitted to the structure. Spacers and dampers are also useful to limit table drift and base shear.
For the seismic design of structures, the traditional method has long been widely used, i. e. the reinforcement of the rigidity, resistance and ductility of the structure. As a result, an increase in structural element size and material consumption is expected, leading to higher construction costs as well as greater seismic responses due to increased structural rigidity. Therefore, the effectiveness of the traditional method is limited. In order to overcome these disadvantages associated with the traditional method, a number of vibration control measures, called structure control, have been investigated and considerable progress has been made in recent years. Structural control is a diverse field of science. Structural control is a current area of ??research to reduce structural vibrations under loads such as earthquakes and high winds. With regard to different vibration damping methods, structural control can be divided into active control, passive control, hybrid control and semi-active control. The base isolation is a passive vibration control system that requires no external power source to operate and uses the movement of the structure to generate control forces. The application of this technology may keep the building to remain essentially elastic and thus ensure safety during large earthquakes. Since a base-isolated structure has fundamental frequency lower than both its fixed base frequency and the dominant frequencies of ground motion, the first mode of vibration of isolated structure involves deformation only in the isolation system whereas superstructure remains almost rigid. Viscous dampers are hydraulic devices that dissipate the kinetic energy of seismic events and cushion the impact between structures. They are versatile and can be designed to allow free movement as well as controlled damping of a structure to protect from wind load, thermal motion or seismic events. The development of bracing made the construction of the skyscraper possible. The straps are pressure resistant. Perimeter frame bracing must be considered to increase the lateral load-bearing capacity of the structure. When inserting struts into a steel frame, the steel frame acts like a diagonal compression strut and transfers the compressive force to another connection. Differences in column stiffness can affect the fracture mode and transverse stiffness of the bracing.
II. LITERATURE REVIEW
In my study, I have concluded that, the high rise RCC building requires LRB and bracing to seismic effect find out. How to effects of parameters such as base LRB as base isolator and steel bracing, storey drift, storey displacement on RCC buildings. LRB placed as base isolator with bracing and without bracing effective on model.
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