Dynamic Analyses of Isolated Structures under Bi-Directional Excitations of Near-Field Ground Motions

Abstract

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.

Comparison of Design Spectra in Turkish Earthquake Codes (TEC and TBEC) in Terms of Seismic Isolator Design

“…Deprem yalıtımlı yapı tepkilerini belirlemek için literatürde yer alan çalışmalara bakıldığında öne çıkan bir diğer önemli nokta da dinamik analizlerin tek doğrultulu [10][11][12] ya da çift doğrultulu [13][14][15] deprem etkileri altında yürütülmesidir. Özdemir ve Akyüz [16] çift ve tek doğrultulu deprem etkileri altında yürüttükleri analizler sonucunda MİD'in ne ölçüde etkilendiğini göstermek üzere, çift doğrultulu analizler ile edilen yalıtım birimi deplasmanlarını tek doğrultulu analizlerden elde edilenler ile kıyaslamışlardır. Yazarlar, depremin her iki yatay bileşeninin eş zamanlı olarak kullanıldığı çift doğrultulu analizlerde elde edilen MİD'in tek doğrultulu analizlere göre %20'lere varan miktarda artış gösterebileceğini vurgulamışlardır.…”

Mechanism Analysis and Parameter Optimization of Mega-Sub-Isolation System

“…Yan and Chen [7] have studied the seismic performance of midstory isolated structures under near-field pulse-like ground motion, in which a mechanical model has been put forward for this protective system based on the Kelvin pounding model, and a new method has been proposed that synthesizes artificial near-field pulse-like ground motion by combining the real near-field nonpulse ground motion with simple equivalent pulses. Ozdemir and Akyuz [8] have analyzed the dynamic responses of isolated structures under bidirectional excitations of near-field ground motions, in which nonlinear response history analyses of a 3-story isolated reinforced concrete building have been carried out under both uni-and bidirectional earthquake excitations of near-field records. A comparative analytical study of several control strategies for semiactive devices installed in base-isolated buildings aiming at reducing earthquake induced vibrations is presented by Oliveira et al [9].…”

Seismic Evaluation of a Multitower Connected Building by Using Three Software Programs with Experimental Verification

“…Hedayat and Yalciner [9] conducted pushover analyses to assess seismic performance of a four-story existing building before and after strengthening. Ozdemir and Akyuz [10] employed dynamic analyses to study seismic performances of an isolated reinforced concrete building. Aly and Abburu [11] obtained seismic responses of two different high-rise buildings with the help of time history analysis.…”