Seismic Performance Evaluation of Vertcial Irregular Structures through Nonlinear Time History Analysis

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Sadeghipour, Arash | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39231 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Mofid, Massoud
Abstract:
Incremental Dynamic Analysis (IDA) is a parametric analysis method that has recently emerged in several different forms to estimate more thoroughly structural performance under seismic loads. Using IDA , the objective is to study the effect of the irregular distribution of stiffness and strength along the height of a 9 story 3D steel structure model. The reference and each modified structure are hence forced to show the complete spectrum of behavior from elasticity to final global instability, allowing the estimation of capacities for the full range of limit-states and enabling a straightforward comparison without needing to “tune” the structures to the same fundamental period and/or the yield base shear. Modelling the structure in 3 dimensions and trying to have a realastic image of seismic behaviour can propose better evaluation. In conclusion, the proposed methodology enables a full-range performance evaluation using a highly accurate analysis method that pinpoints the effect of any source of irregularity for every limit-state.
Keywords:
Incremental Dynamic Analysis ; Nonlinear Dynamic Analysis ; Performance Evaluation ; Nonlinear Time History Analysis ; Limit State ; Vertical Irregularity

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