Comparative study of base isolated systems

Türkmen, Fatih
This thesis is mainly concerned with providing brief knowledge about the effects of earthquakes on buildings and their response to earthquake forces. Principles of advanced passive earthquake resistant design techniques are also presented. Next, the use of the most common passive earthquake resistant design technique; i.e., base isolation is described, with its historical background, main principles and usage in the world. In order to evaluate the effectiveness of base isolation, and the performance of base isolated buildings, three story three frames are modeled with SAP 2000. Bare, Damped and Isolated respectively are compared. For the sake of comparability of the results, the input data for the three frames are kept the same and the output values such as deformation, periods of the buildings, force values are compared. After thisIV stage, a three story structure from an experimental study is modeled in order to find the typical usage of an isolator. After obtaining this specific type of isolator, it is placed in a 6-story structure for the aim of investigating the main benefits of isolators. The structure is modeled in two cases; with and without shearwalls for the aim of evaluating the effect of shearwalls on to the behavior of the fixed and isolated structure.


Evaluation of the site effects of the Ankara basin, Turkey
Kockar, M. K.; Akgün, Haluk (2012-08-01)
Recent major earthquakes have explicitly demonstrated that near-surface local site conditions that can generate significant amplifications and spatial variations of earthquake ground motion play a major role in the level of ground shaking and in gathering information on soft soil response. It is therefore highly desirable to develop methods to identify and characterize regions that are prone to this type of site amplification. To determine the subsurface sediment characteristics over a wide area, measuremen...
Numerical Simulation of three Base Isolation Systems for Earthquake Protection of Structures
Dölen, Melik (null; 2003-10-10)
In a previous paper [1&2] a base isolation system was proposed for earthquake protection of structures. The system incorporates spherical supports for the base, a specially designed spring-cam system to keep the base rigidly supported under normal conditions and to allow it to move for the duration of the earthquake under the constraint of a spring with optimized stiffness characteristics. A high-rise structure was considered to investigate the feasibility of the concept. The simulation of the system respon...
Dynamic analyses of isolated structures under bi-directional excitations of near-field ground motions
Ozdemir, Gokhan; Akyüz, Uğurhan (2012-01-01)
Nonlinear response history analyses (NRHA) of a 3-story isolated reinforced concrete (RC) building are carried out under both uni- and bi-directional earthquake excitations of near-field records. NRHA are conducted for a wide range of yield strength (Q/W) of lead rubber bearings (LRB), and isolation period (T). Selected near-field records are used to investigate both the contribution of orthogonal components on maximum isolator displacements and accuracy of equivalent lateral force (ELF) procedure on estima...
Estimation of earthquake damage probabilities for reinforced concrete buildings
Yücemen, Mehmet Semih (2003-05-13)
Due to uncertainties involved both in the occurrence of earthquakes and in structural response, earthquake damage prediction has to be treated in a probabilistic manner. In this study two statistical methods are presented for the prediction of potential seismic damage to low and mid-rise reinforced concrete buildings in Turkey. These methods are based on the utilization of damage probability matrices and reliability theory. The damage data compiled during recent earthquakes that occurred in Turkey are used ...
Development of rocking-column (ROC) seismic base isolation system for buildings
Javed , Nasir; Türer, Ahmet; Department of Civil Engineering (2020-10-21)
Earthquake mitigation of buildings has been a long-standing matter of research. Researchers have proposed many systems that can be categorized as passive control, active control, and hybrid systems. Seismic base isolation, usually linked to the passive control category, is a well-known technique to isolate a structure from harmful effects of earthquakes. In this research, a new seismic isolation system, different from the conventional seismic base isolation systems, has been proposed and named as Rocking-Co...
Citation Formats
F. Türkmen, “Comparative study of base isolated systems,” Middle East Technical University, 2002.