Generalized Pushover Analysis For Torsionally Coupled Systems

Date

2017-01-13

Author

Kaatsız, Kaan
Alıcı, Fırat Soner
Sucuoğlu, Haluk

Metadata

Show full item record

Item Usage Stats

179
views

0
downloads

Generalized pushover analysis procedure that was previously formulated on 2D planar frames is extended to 3D systems with torsional coupling in the presented study. The instantaneous force distribution acting on the system when the interstory drift at a story reaches its maximum value during seismic response is defined as the generalized force distribution. This force distribution is then expressed in terms of combinations of modal forces. Modal contributions to the generalized force vectors are calculated by a modal scaling rule which is based on the complete quadratic combination. Generalized forces are applied to the mass centers of each story incrementally for producing nonlinear static response. Maximum response quantities are then obtained when the individual frames attain their own target interstory drift values in each story. Finally, internal forces and deformations of the structural members are compiled through an envelope algorithm; registered as the inelastic seismic response of the asymmetric-plan structure. The developed procedure is tested on a plan-asymmetric, torsionally coupled eight-story structure under a set of ground motion records which are employed without any modification. Performance of the procedure is assessed by comparing the results with those obtained from nonlinear time history analysis. Seismic response parameters such as interstory drifts and plastic rotations are presented for selected ground motions as well as mean results calculated for the ground motion set. The method is deemed successful in predicting the torsionally coupled inelastic response of 3D systems in terms of deformation and force demands.

Subject Keywords

Multi-mode pushover, Torsional coupling, Generalized forces, Target drif, Asymmetric structures

URI

https://hdl.handle.net/11511/74653
http://www.wcee.nicee.org/wcee/article/16WCEE/WCEE2017-1599.pdf

Conference Name

16th World Conference on Earthquake, 16WCEE 2017( January 9th to 13th 2017)

Collections

Department of Civil Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

A nonlinear model for amplifiers with memory Yuzer, Ahmet Hayrettin; Demir, Şimşek (2010-12-20) In this study an improved behavioral modeling including even order terms is proposed to model asymmetric IMD components observed in the multi-tone excitation of nonlinear amplifiers. Only odd order model (OOM) and even order introduced model (EOM), proposed model, are constructed and compared for a sample amplifier. It is showed that introducing even order term is improved the model validity range and accuracy in addition to the decrease model polinomial order. © 2010 IEEE.
Generalized force vectors for multi-mode pushover analysis of bridges Perdomo, Camilo; Monteiro, Ricardo; Sucuoğlu, Haluk (2017-12-01) Nonlinear static procedures (NSPs) are gaining wider use in performance based earthquake engineering practice due to their simplicity compared to rigorous nonlinear time history analysis (NTHA), and being implemented in the new generation of seismic design codes. In this study, a recently proposed Nonlinear Static Procedure (NSP) for the seismic performance assessment of building structures using the concept of generalized force vectors (GFV), is further validated through application to reinforced concrete ...
MULTI MODE PROJECTILE TRACKING WITH MARGINALIZED PARTICLE FILTER Bilgin, Ozan Ozgun; Demirekler, Mübeccel (2015-10-30) In this study, dynamic models for thrusting and ballistic flight modes of multi mode projectile are obtained and Marginalization method is applied by separation of the linear and nonlinear parts of state space model. In Marginalized Particle Filter (MPF), dimension of the nonlinear system is reduced so that the model can be utilized to obtain better estimates of the state using the same number of particles as that of standard particle filter. The Extended Kalman Filter (EKF), the Particle Filter (PF) and th...
Extended dynamical symmetries of Landau levels in higher dimensions Kürkcüoğlu, Seçkin; YURDUŞEN, İSMET (Springer Science and Business Media LLC, 2020-02-14) Continuum models for time-reversal (TR) invariant topological insulators (Tis) in d >= 3 dimensions are provided by harmonic oscillators coupled to certain SO(d) gauge fields. These models are equivalent to the presence of spin-orbit (SO) interaction in the oscillator Hamiltonians at a critical coupling strength (equivalent to the harmonic oscillator frequency) and leads to flat Landau Level (LL) spectra and therefore to infinite degeneracy of either the positive or the negative helicity states depending on...
Capturing inelastic coupling of internal forces and exact vibration frequencies for 3 d Timoshenko beam finite elements Soydaş, Ozan; Sarıtaş, Afşin (null; 2016-08-28) A three dimensional (3d) nonlinear frame finite element based on Timoshenko beam theory is presented in this analytical study by utilizing Hu-Washizu principle with displacement, strain and stress independent fields in the variational form. The finite element approximation for the beam uses shape functions for section forces that satisfy equilibrium and discontinuous section deformations along the beam. The element is free from shear-locking, and the superiority of the proposed model is displayed under nonl...

Citation Formats

K. Kaatsız, F. S. Alıcı, and H. Sucuoğlu, “Generalized Pushover Analysis For Torsionally Coupled Systems,” presented at the 16th World Conference on Earthquake, 16WCEE 2017( January 9th to 13th 2017), Santiago, Chile, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/74653.