Response modification factor of concentrically braced frames with hexagonal pattern of braces

Kheyroddin, Ali; Mashhadiali, Niloufar

doi:10.1016/j.jcsr.2018.06.024

Cited by 21 publications

(7 citation statements)

References 27 publications

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“…In summary, the results showed that although low-to -midrise structures designed with response spectrum analysis met the collapse criteria with considerable safety, long period structures failed to satisfy these criteria. Also in recent years, some scholars employed this methodology to assess and quantify SPFs of conventional structural systems [18][19][20][21][22][23][24][25].…”

Section: Sn Applied Sciencesmentioning

confidence: 99%

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

2021

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This study presents the impact of near-field and far-field earthquakes on the seismic design of Intermediate Moment Resisting Frame (IMRF) and Special Moment Resisting Frame (SMRF) structures through FEMA (Federal Emergency Management Agency) P695 methodology to highlight the importance of probabilistic collapse as well as seismic performance factors of these structures. The purpose of this study is to investigate the collapse performance of steel intermediate and special moment resisting frame systems as the most common structural systems in urban areas in order to assess the seismic performance factors used for the design using nonlinear static and dynamic analysis methods. In this regard, as the representatives of low-rise to high-rise buildings, archetypes with 5-, 10- and 15- story of intermediate and special moment resisting frames are designed and then the nonlinear models are developed in OpenSees software. Nonlinear static analyses are performed to assess the overstrength and ductility of these systems. The effects of near-field and far-field ground motions on these frames are investigated through incremental dynamic analysis. These analyses are performed with 22 far-field and 20 near-field ground motion records using FEMA P695 methodology. The results show that near-field earthquakes have serious impacts on the collapse probability of structures. The superiority of special moment resisting frame over intermediate moment resisting frame is quantified in terms of safety margin and median collapse capacity under both near-field and far-field earthquakes. Finally, the results indicate that the response modification factors introduced in seismic design code are acceptable for intermediate moment resisting frame and special moment resisting frame under far-field ground motions. However, in the near-field sites while SMRF system meets the requirements of FEMA P695 methodology, the IMRF system does not satisfy these criteria.

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Section: Sn Applied Sciencesmentioning

confidence: 99%

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

2021

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“…In incremental dynamic analysis, capacity curves of a structure is estimated by applying several earthquakes with incremental scale factors considering the nonlinear phase of structure material. Several researches utilized [12][13][14][15][16][17] this numerical method to estimate the seismic parameters. Soltangharaei et al, 2015 and 2016, [12,15] estimated the seismic parameters of steel buckling restrained and steel moment restrained frames using incremental dynamic analysis with considering the near-fault or far-fault earthquake effects.…”

Section: Seismic Parametersmentioning

confidence: 99%

Seismic Performance Evaluation of Knee and EBF Braced Frames Using Nonlinear Static Analysis

Moshtagh¹,

Saberi²,

Saberi³

2018

IJSEA

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Earthquake-resistant structure systems should be designed to stand large deformation to absorb and attenuate imposed energy due to an earthquake while providing sufficient stiffness to transfer the forces to the base without collapse. Knee Braced Frames (KBF), which involves added additional diagonal elements to a frame to increase its ability to withstand lateral loads, is suggested by several researches. In this study, the seismic performance of KBFs are evaluated and compared with Eccentric Braced Frames (EBF). Nonlinear static analyses were utilized for seismic evaluation and comparison between the mentioned frame systems. Three steel structures of 5, 10, and 15-story were numerically modeled, and the seismic parameters such as lateral stiffness, inter-story drift, ductility, and response modification factors were calculated for each structure system. It was observed that using KBF systems resulted in a reduction in intersotry drifts compared to EBFs. KBF systems show more stiff responses in comparison with EBFs and they presented much more stiff response by reducing the knee element length. The KBFs have more ductile behavior in comparison with EBFs, although base shear in KBFs is less than EBFs.

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“…Previous studies were conducted in order to define the parameters affecting the q-factor value of concentrically braced frames [6][7][8][9][10][11]. Some of these parameters include type of bracing system, bay lengths, and type of connections between structural members.…”

Section: Introductionmentioning

confidence: 99%

Overstrength and ductility factors of XBF structures with pinned and fixed supports

Yahmi

Branci

Bouchaïr

et al. 2023

Studia Geotechnica Et Mechanica

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In today's time, most seismic design codes are based on a linear elastic force-based approach that includes the nonlinear response (ductility and overstrength) of the structure through a reduction factor (named behavior factor q in Eurocode 8 [EC8]). However, the use of a prescribed q-factor that is constant for a given structural system may fail in providing structures with the same risk level. This paper focuses on the estimation of actual values of q-factor for X-braced steel frames (XBFs) designed according to the European codes and comparing these values to those suggested in EC8. For this purpose, a nonlinear pushover analysis has been performed. The effects of specific parameters, such as the stories number, the brace slenderness ratio, the local response of structural members, and the support type, are evaluated. The results show that the most important parameter that affects the q-factor is the brace slenderness ratio, while the support type has less effect on this factor. Furthermore, a local strength criterion has been proposed to implicitly ensure that the suggested value of the q-factor is conservative.

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Response modification factor of concentrically braced frames with hexagonal pattern of braces

Cited by 21 publications

References 27 publications

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

FEMA P695 methodology for safety margin evaluation of steel moment resisting frames subjected to near-field and far-field records

Seismic Performance Evaluation of Knee and EBF Braced Frames Using Nonlinear Static Analysis

Overstrength and ductility factors of XBF structures with pinned and fixed supports

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