چكيده به لاتين
Abstract:
Conventionally, seismic design of building structures is based on the concept of increasing the resistance capacity of the structures against earthquakes by employing, for example , the use of shear walls, braced f rames, or moment-resistant frames. However, these traditional methods often result in high floor accelerations for stiff buildings, or large interstory drifts for flexible buildings .Base isolation is one of the modern methods of passive control systems which results on increase of the period and damping of structure and decreasing the effective seismic force on the structure. There are a lot of system for controlling response of structures which one of t hem is Lead Rubber Bearing(LRB). In the present study, the effects of LRB isolators in the concreat structures with shear walls walls under near-fault and far-faul excitations are investigated. The force-deformation behaviour of the LRB isolator is modeled as bilinear. Nonlinear time history analysis have been applied that 20 near-fault ground motion and 8 far-fault ground motion have been exerted on 3 building. The buildings are 4 story, 10 story and 15story. Then e ffects of isolator design displacement and characteristic strength of LRB on variation of top floor acceleration, base shear, bearing displacement and first floor drift(relative displacement of two floor to story hight) are obtained.
Keywords: Base isolation,,Lead Rubber Bearing Characteristic strength of isolator, Near-fault and far-fault excitation,
