Development of rocking-column (ROC) seismic base isolation system for buildings

Javed , Nasir
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-Column (ROC) seismic isolation system. The working principle of ROC is to isolate a building by the use of story-high rocking columns. The study is inspired from earthquake response of ancient rocking columns used in Greek Civilization as well as Pagoda structures constructed mostly in Japan, where the first floor or all stories are flexible and behave like isolators. The research comprises following stages: 1) comprehensive review of the literature regarding rocking of rigid blocks, 2) development of a nonlinear numerical model in commercially available software (SAP2000), which simulates the rocking column behavior, 3) experimental validation of the numerical model via testing of small scale prototypes, 4) analyses of different ROC seismically isolated building models (2D, 3D, mass and stiffness vertical irregularities), and 5) development of preliminary design guidelines for ROC seismic isolation systems installed in medium rise residential buildings. Analyses results have proven that the width and height (slenderness) of rocking rectangular columns are the most important parameters which outline the performance of the ROC seismic isolation systems. Other parameters that influence the effectiveness of the ROC seismic isolators include the nature and magnitude of earthquakes, total number of floors, and column bay size of buildings. The simulation results have demonstrated that ROC systems indubitably isolates buildings even for largest earthquakes. Additionally, the suggested “restraining mechanism” in the ROC isolation system prevents any total collapse of buildings. The proposed system may be applied to existing buildings, which may also provide an additional parking space or an extra floor. The outcome of the analyses showed that the ROC system generally performs better than that of the conventional isolation systems of laminated rubber bearing (LRB) and friction pendulum system (FPS). The proposed ROC seismic isolation system may provide an alternative to the existing seismic isolation systems for medium rise buildings. The major design parameters of a) ROC’s column height and base width (slenderness), b) number of stories, c) bay size (5m or 7.5m), d) different earthquake records are changed and responses for i) overturning, ii) floor accelerations, iii) interstory drifts, and iv) first floor total shear were obtained in graphical format, which then helped to produce preliminary design tables of the ROC isolator system for medium rise residential buildings.


Comparative study of base isolated systems
Türkmen, Fatih; Akyüz, Uğurhan; Department of Civil Engineering (2002)
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...
Development of a GIS software for evaluating network relibility of lifelines under seismic hazard
Oduncuoğlu, Lütfi; Düzgün, H. Şebnem; Kestel, Sevtap Ayşe; Department of Geodetic and Geographical Information Technologies (2010)
Lifelines are vital networks and it is important that those networks are still be functional after major natural disasters such as earthquakes. The goal of this study is to develop a GIS software for evaluating network reliability of lifelines under seismic hazard. In this study, GIS, statistics and facility management is used together and a GIS software module, which constructs GIS based reliability maps of lifeline networks, is developed by using geoTools. Developed GIS module imports seismic hazard and l...
A GIS-based software for lifeline reliability analysis under seismic hazard
Kestel, Sevtap Ayşe; ODUNCUOĞLU, Lütfi (2012-05-01)
Lifelines are vital networks, and it is important that those networks are still functional after major natural disasters such as earthquakes. Assessing reliability of lifelines requires spatial analysis of lifelines with respect to a given earthquake hazard map. In this paper, a GIS-based software for the spatial assessment of lifeline reliability which is developed by using GeoTools environment is presented. The developed GIS-based software imports seismic hazard and lifeline network layers and then create...
Seismic strengthening of RC structures with exterior shear walls
KAPLAN, HASAN; Yilmaz, Salih; Cetinkaya, Nihat; Atimtay, Ergin (2011-02-01)
Vulnerable buildings and their rehabilitation are important problems for earthquake regions. In recent decades the goal of building rehabilitation and strengthening has gained research attention and numerous techniques have been developed to achieve this. However, most of these strengthening techniques disturb the occupants, who must vacate the building during renovation. In this study, a new strengthening alternative for RC structures, namely exterior shear walls, has been experimentally investigated under...
Comparison of loads in Turkish earthquake code with those computed statistically
Firat, Fatih K.; Yücemen, Mehmet Semih (2015-05-01)
In this study, earthquake loads are investigated statistically and compared with the nominal earthquake loads calculated according to the Turkish Earthquake Code, namely: "Specifications for Structures to be Built in Earthquake Areas". For this purpose, the "actual" mean load values estimated from statistical methods and the nominal load values computed according the Seismic Code are compared, with respect to some variations in the basic parameters, such as the importance factor, building height, site coeff...
Citation Formats
N. Javed, “Development of rocking-column (ROC) seismic base isolation system for buildings,” Ph.D. - Doctoral Program, Middle East Technical University, 2020.