28-10-2014, 12:13 PM
Abstracts: Base isolation systems have become a significant element of a structural system to enhance reliability during an earthquake. The seismic base isolation system of buildings has been a successful strategy for the past 30 years. Seismic isolation system ensures the safety of any type of building even under most severe earthquakes. The base isolation system separates the structure from its foundation and primarily moves the natural frequency of the structure away from the dominant frequency range of the excitation via its low stiffness relative to that of the upper structure. So base isolation allows a design for smaller seismic forces and higher levels of safety compared with the design of fixed-base structures. Seismic base isolation is an earthquake resistant method that is based on decreasing the seismic demand instead of increasing the seismic capacity. The base isolation seismic protection technique allows the structure to function with no damage after major earthquakes with a negligible construction costs increase or even cost reduction in high intensity seismic areas. In the occurrence of an earthquake, the protection system will ensure the safety of the structure, by avoiding damage to structural elements. In this, the concept and overview of the present state of base isolation system with special emphasis and a brief on applications and uses of seismic base isolation system. Seismic protection is a primary task for strategic structures such as military buildings, power stations, chemical and nuclear plants, hospitals; these structures must survive and be functioning during emergencies due to strong earthquakes.