Dynamic analyses of isolated structures under bi-directional excitations of near-field ground motions

Ozdemir, Gokhan
Akyüz, Uğurhan
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 estimation of maximum isolator displacements. Analyses results show that both the contribution of orthogonal components and accuracy of ELF procedure depend on the soil condition where isolation system is implemented.


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...
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...
Dynamic simulation of shaking table tests for a shearwall building having torsion
Nazırzadeh, Saeıdeh; Yakut, Ahmet; Department of Civil Engineering (2012)
Simulating the non-linear response of reinforced concrete (RC) buildings subjected to a sequence of input earthquake records, is an extremely complex concern in the field of the Earthquake Engineering. Buildings with no symmetry in plan have much more complicated behavior under earthquake effects than symmetric buildings. Torsional irregularity in plan is the main topic of many current researches. In previous decades, considerable amount of numerical and experimental studies have been conducted, but more re...
Shake table tests of different seismic isolation systems on a large scale structure subjected to low to moderate earthquakes
Shahan, Nefize; Caner, Alp (2018-12-01)
Seismic isolation systems designed for extreme events may likely experience low to moderate earthquakes during the design life of the structure rather than the extreme event itself. In new seismic building design codes, low and moderate earthquakes are also mandatory to be investigated in Turkey and some other countries. One of the main reasons is to protect the integrity of non-structural elements or machines during these types of earthquakes. The selection of appropriate seismic isolation is typically dec...
Çabuk, Eser; Akyüz, Uğurhan; Department of Civil Engineering (2021-9-09)
In Turkey, seismic base isolation have become mainly used passive earthquake control system especially among hospital structures after the amendment of Ministry of Health in 2014, regulating the design of hospitals in high seismic zones. Rubber and sliding type of isolators have been applied, and several different hysteresis models, which are essentially acceptable in seismic codes, were used in their design process. However, due to the complexity in the development of highly nonlinear models, engineers ten...
Citation Formats
G. Ozdemir and U. Akyüz, “Dynamic analyses of isolated structures under bi-directional excitations of near-field ground motions,” SHOCK AND VIBRATION, pp. 505–513, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35229.