Numerical Analysis of Dynamic Behavior of Mechanically Stabilized Earth Walls with GeosyntheticsAn Investigation of Seismic Base-isolators on Stories Displacements and Plastic Hinge Formation

doi:10.22075/jme.2017.1515

Numerical Analysis of Dynamic Behavior of Mechanically Stabilized Earth Walls with GeosyntheticsAn Investigation of Seismic Base-isolators on Stories Displacements and Plastic Hinge Formation

10.22075/jme.2017.1515

Abstract

Â Â Abstract Earthquake bas-isolation design for structures is based on demand reduction instead of seismic capacity increasing. The effectiveness of two types of seismic base-isolator on base shear and story shear reduction were investigated in this paper. Four structures (2, 5, 8 and 12 story buildings) with different cases including fixed base, laminated rubber bearing (LRB) and frictional pendulum system (FPS) and different isolator stiffness were modeled. The nonlinear time history analysis were performed on all modeled structures subjected to Manjil, Naghan, Tabas and El centro earthquake records. The results show that the LRB increases the maximum story displacement but decreases the story drifts. However, comparison of the results for FPS and fixed base show that the maximum roof displacements for FPS do not increase. Using the seismic isolator decrease the number of displacement response cycles and hinge formation. In general, the seismic isolators are very useful for low-rise structures, specifically for Iranian

Keywords

Key words: Seismic Isolator

Laminated Rubber Bearing

Frictional Pendulum System

Story displacement

Story Drift