Evaluation of Seismic Response Factors for Eccentrically Braced Frames Using FEMA P695 Methodology

Topkaya, Cem
This paper reports details of a numerical study undertaken to evaluate seismic response factors for steel eccentrically braced frames (EBFs) using the FEMA P695 methodology. Six archetypes were designed by making use of the current U.S. specifications, and their behavior was assessed by making use of nonsimulated collapse models. Results indicate that the current values of response factors result in designs with higher collapse probabilities than expected. Two modifications were developed to bring the collapse probability of these archetypes to acceptable levels. The first modification is on the deflection amplification factor while the second one is on the response modification coefficient. Six archetypes were redesigned using the proposed modifications and reevaluated using the FEMA P695 methodology. The results indicate that the proposed modifications are adequate to satisfy the target collapse probability. Maximum and cumulative link rotation angles were observed to be less than the predefined limits.


Evaluation of seismic response factors for BRBFs using FEMA P695 methodology
Ozkihc, Yasin Onuraip; Bozkurt, Mehmet Bakir; Topkaya, Cem (Elsevier BV, 2018-12-01)
This paper reports the details of a numerical study undertaken to evaluate seismic response factors for steel buckling-restrained braced frames (BRBFs) using the FEMA P695 methodology. In the United States, BRBFs are designed according to Minimum Design Loads for Buildings and Other Structures (ASCE 7) and the Seismic Provisions for Structural Steel Buildings (AISC 341). Twenty-four archetypes were designed according to the U.S. specifications and their behavior was assessed by making use of non-simulated c...
Evaluation of displacement coefficient method for seismically retrofitted buildings with various ductility capacities
Dicleli, Murat (Wiley, 2014-07-25)
This research study is aimed at evaluating the accuracy of the displacement coefficient method (DCM) of FEMA 440 and associated nonlinear static procedure (NLSP) for actual buildings with soft story mechanism and various ductility capacities. The DCM and associated NLSP are evaluated using two existing seismically vulnerable buildings with soft story mechanism. The buildings are first retrofitted using a ductile steel-brace-link system to represent those with good ductility capacity and then retrofitted wit...
Probabilistic seismic hazard assessment of Eastern Marmara Region
Gülerce, Zeynep (Springer Science and Business Media LLC, 2013-10-01)
The objective of this study is to evaluate the seismic hazard in Eastern Marmara Region using an improved probabilistic seismic hazard assessment methodology. Two significant improvements over the previous seismic hazard assessment practices are accomplished in this study: advanced seismic source characterization models in terms of source geometry and recurrence relationships are developed, and improved global ground motion models (NGA-W1 models) are employed to represent the ground motion variability. Plan...
Performance of seismic-isolated bridges in relation to near-fault ground-motion and isolator characteristics
Dicleli, Murat (SAGE Publications, 2006-11-01)
This paper investigates the performance of seismic-Isolated bridges (SIBs) subjected to near-fault (NF) earthquakes with forward rupture directivity effect (FRDE) in relation to the isolator, substructure, and NF earthquake properties, and examines some critical design clauses in AASHTO's Guide Specifications for Seismic Isolation Design. It is found that the SIB response is a function of the number of velocity pulses, magnitude of the NF ground motion, and distance from the fault. Particularly, a reasonabl...
Deformation Limits for Structural Walls with Confined Boundaries
Kazaz, Ilker; Gulkan, Polat; Yakut, Ahmet (SAGE Publications, 2012-08-01)
For accurate analytical assessment of performance and damage in reinforced concrete members, well-defined deformation limits at particular damage states are required. With advanced and computationally intensive finite element analyses, we establish deformation limits at yield and ultimate limit states for adequately confined rectangular reinforced concrete structural walls in terms of drift ratio, plastic rotation, and curvature. To investigate the deformation limits of structural walls, a parametric study ...
Citation Formats
A. KUŞYILMAZ and C. Topkaya, “Evaluation of Seismic Response Factors for Eccentrically Braced Frames Using FEMA P695 Methodology,” EARTHQUAKE SPECTRA, pp. 303–321, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37224.