- A New Procedure for Selection and Modification of Ground Motion for Nonlinear Dynamic Analysis Strong Ground Motion for Nonlinear Dynamic Analysis
- M. Nooraie ; F. Behnamfar
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: ground motion selection and modification ; Nonlinear dynamic analysis
- Description
- Nonlinear dynamic analysis is known as the most accurate method to evaluate the behavior of structures during an earthquake. In this context, the selection process of suitable records and their modification plays a vital role. An effective selection and modification of ground motion as the loads to be used in the analysis can lead to responses with low dispersion in nonlinear structural analysis. This in turn, results in much more trust in the safety of the designed structure. This fact highlights the importance of the current study. Screening process is a three-stage operation as the Coarse, Medium, and Fine-Screen sub-processes. The remaining records are modified in order to minimize the scatter in the results of nonlinear dynamic analysis of the structure under study, by calculating scale factors by different methods to be multiplied to the selected earthquake time histories. The proposed method results in least scatter in representative nonlinear dynamic response quantities.
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- Seismic Behavior of New Visco Plastic Device Equipped with Stell Cores and Viscoelastic Solid
- A.B. Sheikholeslami ; F. Behnamfar
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: Visco-plastic device ; steel cores ; passive energy dissipation
- Description
- This paper presents the preliminary results of an analytical and finite element investigation into the effectiveness of a new Visco-Plastic energy dissipation device. This new device, which is fabricated from readily available structural steel rods and viscoelastic solids, has a wide range of application in building and bridge structures. Input energy due to seismic excitation is dissipated by yielding of steel cores and shear strain in viscoelastic layer. One of the important abilities of the proposed energy dissipating device is its good performance under cyclic loading and high speed of repair. This is such a manner that after an intermediate or strong earthquake without need of foreman and extra equipment, only with changing the ductile steel cores used in the device, the
repairing process of structure can be accomplished very fast.
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- Collapse Performance Evaluation of Reinforced Concrete Special Moment Frame Systems Special Moment Frame Systems Considering Soil–Structure Interaction
- F. Behnamfar ; S. Haghollahi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: Seismic collapse performance ; soil-structure interaction ; push-over ; IDA
- Description
- This study investigates an application of FEMA P695 (ATC-63) methodology for assessing collapse performance of reinforced concrete (RC) structures including the effect of soil-structure interaction. The new generation of performance based design approaches consider the SSI as a direct concern in order to more realistically estimate the seismic performance of structures. In response, this study investigates the SSI effects on seismic performance from within the framework of collapse performance evaluation of a medium height (eight-story) RC special moment frame structure. Comparison with similar studies on fixed-base counterparts results in prescribing conditions for how collapse evaluation should be implemented with SSI taken into account. In this paper the effect of SSI on the collapse behavior of the RC structure is illustrated by both pushover and IDA analysis in comparison with the fixed base structure.
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