Evaluation of deflection amplification factor for steel buckling restrained braced frames

Yakhchalian, Masood; Asgarkhani, Neda; Yakhchalian, Mansoor

doi:10.1016/j.jobe.2020.101228

Cited by 27 publications

(5 citation statements)

References 32 publications

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“…Figure. After the N=10 4 cycles of pressure, the residual voltages in the D16AT alloy are reduced by 50%, in the alloy of VT3-1 by 33%, and in steel 30XNS2A -only by 17%. This suggests that the use of PPD methods is appropriate; primarily to increase resistance to fatigue of parts from high-strength materials, where technological residual voltage spling is more stable during operation [19][20].…”

Section: Discussionmentioning

confidence: 99%

Relaxation patterns of technological residual voltage in the surface layer of high-strength steel when cyclically loaded

Kravchenko

Smolyaninov

et al. 2021

E3S Web Conf.

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Experimentally investigated patterns of changes in technological residual stresses under the influence of variable pressure in the surface layer became 30XNS2A. A mathematical model of relaxation of residual compressive stresses created by surface plastic deformation techniques with symmetrical cyclical bending of samples has been proposed. An empirical expression is proposed for assessing the final value of residual stresses as a result of cyclic loading, depending on the stress amplitude of a symmetric cycle. An expression is given for estimating the coefficient of relaxation rate of residual compressive stresses from their initial value, amplitude of alternating stresses and material properties. The constants of these expressions are determined for various construction materials. The theoretical dependences describe well the obtained experimental data. To predict the level of residual stress realization under operational loading, a formula was obtained to calculate their change as a result of the action of a step loading block with different amplitudes and duration of their action at each of the stages.

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Section: Discussionmentioning

confidence: 99%

Relaxation patterns of technological residual voltage in the surface layer of high-strength steel when cyclically loaded

Kravchenko

Smolyaninov

et al. 2021

E3S Web Conf.

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“…Masood Yakhchalian et al [50] evaluated the deflection amplification factor (C d ) of steel buckling restrained braced frames (BRBFs) using six regular low-to-midrise structures ranging from two to twelve stories under the design earthquake. The study compared the adequacy of the ASCE recommended C d value of 5.0 for estimating inelastic maximum drift ratios (IMIDRs) in steel BRBFs.…”

Section: Steel-braced Structuresmentioning

confidence: 99%

Developments in Quantifying the Response Factors Required for Linear Analytical and Seismic Design Procedures

Hussain,

Alam,

Mwafy

2024

Buildings

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Despite the recent initiatives and developments in building design provisions using performance-based design, practicing engineers frequently adopt force-based design approaches, irrespective of the structural system or building irregularity. Modern seismic building codes adopt the concept of simplifying the complex nonlinear response of a structure under seismic loading to an equivalent linear response through elastic analytical procedures using seismic design response factors. Nevertheless, code-recommended seismic design response factors may not result in a cost-effective design with a uniform margin of safety for different structural systems. Previous studies also adopted different methodologies for quantifying the seismic response factors. Hence, there is a pressing need for a comprehensive review covering the developments in quantifying these vital design factors. This paper presents a systematic review of the response factors used with linear analytical procedures recommended by modern building design provisions and the techniques employed in previous studies to evaluate these factors using SDOF and MDOF systems covering analytical, experimental and hybrid assessment approaches. Limitations and gaps identified from the previous studies indicated that most investigations focused on 2D analysis and regular low-rise buildings, while limited studies were directed to shear wall structures, considering mostly unidirectional seismic loading. This comparative review provides insights into previous studies’ methodologies and constraints and identifies the need for future research to calibrate seismic response factors to achieve more economical designs with consistent safety margins for different structural systems.

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“…The yielding core length was assumed equal to 0.7 times the work point to work point length of the brace. The cross-section areas of the non-yielding segments were assumed equal to 5.0 times that of the brace core (Yakhchalian et al 2020;Asgarkhani et al 2020;Yakhchalian et al 2021). In addition, three elasticBeamColumn elements with negligible cross-section area and very high moment of inertia were added in parallel to the three corotTruss elements to prevent assumed for the beams and columns and ties; whereas for BRBs E0 = 0.12 and m = -0.458 were employed, according to the study by Uriz and Mahin (2008).…”

Section: Structures Considered and Modelingmentioning

confidence: 99%

Probabilistic seismic performance assessment of rocking buckling restrained braced frames

Soltani

Yakhchalian

Tavakoli

et al. 2023

Preprint

Self Cite

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One of the new lateral force resisting systems introduced to improve seismic performance of structures is rocking buckling restrained braced frame (RBRBF). This lateral force resisting system in each bay includes buckling restrained braces (BRBs) on one side and conventional braces on the other side, and vertical links between the upper ends of braces located in adjacent stories. In this system, conventional braces and adjacent columns are designed to remain elastic until near seismic collapse. In this paper, RBRBFs are designed according to a displacement-based design approach. Maximum interstory drift ratio (MIDR) and maximum residual interstory drift ratio (MRIDR) are among the most critical engineering demand parameters (EDPs) used for assessing the safety of structures after an earthquake. The primary aim of this study is to investigate the effects of utilizing RBRBFs on MIDR and MRIDR responses compared with buckling restrained braced frames (BRBFs). For this purpose, 4-, 8-, and 12-story structures with RBRBF and BRBF systems are considered, and their collapse capacity values and residual drift capacity values given different levels of MRIDR are computed using incremental dynamics analyses (IDAs). After computing the capacity values, the mean annual frequencies (MAFs) of collapse (λCol) and exceeding different MRIDR levels (λRD) are obtained. The results demonstrate that all RBRBFs have better collapse and residual drift performance than BRBFs. Based on these results, the use of RBRBFs dramatically reduces BRBF weaknesses including the concentration of damage in a single story and low post-yield stiffness.

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Evaluation of deflection amplification factor for steel buckling restrained braced frames

Cited by 27 publications

References 32 publications

Relaxation patterns of technological residual voltage in the surface layer of high-strength steel when cyclically loaded

Relaxation patterns of technological residual voltage in the surface layer of high-strength steel when cyclically loaded

Developments in Quantifying the Response Factors Required for Linear Analytical and Seismic Design Procedures

Probabilistic seismic performance assessment of rocking buckling restrained braced frames

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