An improved and innovative formulation for calculating amplified elastic story drift induced by RBS connections in steel moment frames

Fanaie, Nader; Faegh, Shervin Safaei; Partovi, Fatemeh

doi:10.1016/j.jcsr.2019.06.003

Cited by 22 publications

(5 citation statements)

References 7 publications

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“…Where E is the modulus of elasticity of the device's material, and I is the moment of inertia of the device about the bending axis (weak axis). The virtual work method along with the method of least work, are two of the well-known, powerful, and rigorous approaches in structural analysis by which several structural analysis problems in the indeterminate systems have been addressed in previous studies [19,20]. Based on the method of least work, the total strain energy should be minimized in terms of two independent parameters of MO and VO.…”

Section: Analysis Of the Curved Element With The Methods Of Least Workmentioning

confidence: 99%

An improved cable-cylinder bracing system with quarter-ring yielding devices for seismic retrofit of steel moment frames

Bursi

Fanaie

Faegh

et al. 2021

Bull Earthquake Eng

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Cable-cylinder bracing system is a novel system composed of two steel cables and a steel pipe installed in a frame center. This system exhibits several merits mainly due to its simplicity; however, it needs to be enhanced due to limited source of energy dissipation, caused by plastic hinges formed at the ends of the beam, turning up some inappropriate cyclic behaviors in the hysteresis diagram of the system and also rupturing of the cables in large drifts. Therefore, we suggest the use of replaceable devices made of steel quarter-rings; and we propose a couple of accurate, practical, and simple formulas to calculate steel quarter-rings thickness utilized as replaceable devices. These equations correspond to the number of plastic hinges formed in the device partially under the capacity based design method. Also, the validity of these formulas along with the design requirements of device geometric parameters is fully examined and discussed by conducting FEbased parametric studies. Then, through the addition of four curved yielding devices made of low-yield-point steel to a cable-cylinder bracing system, the performance of the proposed system subjected to cyclic loading is identified.Based on the results, the new enhanced system represents a cost-effective,

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Section: Analysis Of the Curved Element With The Methods Of Least Workmentioning

confidence: 99%

An improved cable-cylinder bracing system with quarter-ring yielding devices for seismic retrofit of steel moment frames

Bursi

Fanaie

Faegh

et al. 2021

Bull Earthquake Eng

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“…Scholars proposed two research directions to meet seismic design requirements: strengthening the connection area and weakening the beam section 6–14 . Strengthening involves enhancing the connected member's strength by increasing flange width and adding cover plates, ribs, and haunches 15–17 . While effective, it complicates the structure, raises costs, and reduces ductility.…”

Section: Introductionmentioning

confidence: 99%

Seismic behavior of reduced beam section joints considering concrete floor effect

Lu,

Luo,

Han

et al. 2024

Structural Design Tall Build

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SummaryThis study investigates the seismic impact of concrete floors on reduced beam section beam‐to‐column joints through four quasi‐static cyclic tests. We examine mechanical properties, failure modes, and processes against specific criteria. Additionally, we analyze hysteretic response, energy dissipation, stiffness, capacity, and stress–strain mechanisms. Moreover, the ABAQUS platform was used to reproduce the specimen nonlinear finite element model to compare and analyze the test results. The results showed that the specimens exhibit excellent energy dissipation capacity and ductility (with a coefficient of 5.00); the column‐bar connection characteristics affect the maximum capacity and plastic hinge behavior in the reduced beam area. The reduced section of beam's upper flange could not improve the overall seismic performance of the joint. The observed failure sequence is as follows: concrete floor cracking, beam flange yielding, reinforcement fracture, lower flange yielding in the reduced beam area, and overall joint failure. This sequence confirms that the joint fulfills the design criteria of a “strong column‐weak beam” by achieving the target of plastic hinge outward movement.

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“…The first investigation on double reduced beam section was carried out by [57], in which two adjacent radius cuts was implemented in beam flange named as DRBS, and concluded that implementing the second cut leads to maximum equivalent plastic strain index reduction as well as delaying the local buckling. Investigating the behavior of RBS connections through numerical or experimental studies in the recent years are conducted by many researchers among which [67][68][69][70][71][72][73][74][75][76] can be mentioned. Fanaie et al [69] pointed to a method in which a mathematical approach in conjunction with principles of structural analysis is employed in order to acquire the drift as well as changes in stiffness of stories in frames with RBS connections.…”

Section: Introductionmentioning

confidence: 99%

“…Investigating the behavior of RBS connections through numerical or experimental studies in the recent years are conducted by many researchers among which [67][68][69][70][71][72][73][74][75][76] can be mentioned. Fanaie et al [69] pointed to a method in which a mathematical approach in conjunction with principles of structural analysis is employed in order to acquire the drift as well as changes in stiffness of stories in frames with RBS connections. Meng et al [77] introduced a novel RBS connection with V-shaped reinforcing plate which improved the seismic performance of RBS connections.…”

Section: Introductionmentioning

confidence: 99%

“…Although comparing the behavior of interior connections with voids in beam web or flange has received numerous attention, there exists a significant ambiguity regarding the behavior of frames with web or flange cuts since cutting a part of the beam alters the force transfer from the beam to the column [95,129] and parameters affecting the strength of the frame such as opening area, shape, use of stiffeners, etc., are of great significance in the behavior, resistance, energy dissipation capacity, and failure mode of the connections [2,[23][24][25]114]. Hence, numerous studies have been conducted on steel connections including Reduced Beam Section (RBS) [64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79], Reduced Web Section (RWS) , Drilled Flange Connection (DFC) [115][116][117][118][119][120][121][122][123][124][125], and many design codes and standards [1,10,[18][19][20][27][28][29] employed the introduced connections as an engineered connections. Since each connection has advantages and disadvantage, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Behavior of Interior Steel Connections With Openings in Beam Web and Flange Under Monotonic Loading

2021

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Connections are considered to be one of the most prominent components of steel moment frames and have received studious attention in recent years. The core problem of welded connections is premature brittle fracture of weld in the critical beam-to-column connection region. Within the framework of this issue, various approaches have been proposed to solve the mentioned problem. Intentional weakening of the beam web or flange is in line with the purpose of leading the plastic hinge away from the column face, hence, increasing the ductility. The aim of this research is to investigate the behavior of interior connections subjected to monotonic lateral loading in case of presence of openings in beam web or flange. To do so, an ordinary fully welded rigid connection, reduced beam section, reduced web section, and drilled flange connection models are simulated numerically, utilizing finite element software, ANSYS. The results indicate that scrupulous selection of opening sizes are of great importance to fulfill the desired outcome which is avoiding the brittle failure of connections. Furthermore, the use of drilled flange, reduced beam section, or reduced web section connections satisfy the expected performance and it is proposed to use them according to practicability, architectural and economic considerations as well as site conditions. Shear deformation and local buckling is observed in reduced web section connections while in drilled flange connections, stress concentration around the opening is critical.

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An improved and innovative formulation for calculating amplified elastic story drift induced by RBS connections in steel moment frames

Cited by 22 publications

References 7 publications

An improved cable-cylinder bracing system with quarter-ring yielding devices for seismic retrofit of steel moment frames

An improved cable-cylinder bracing system with quarter-ring yielding devices for seismic retrofit of steel moment frames

Seismic behavior of reduced beam section joints considering concrete floor effect

Investigation of Behavior of Interior Steel Connections With Openings in Beam Web and Flange Under Monotonic Loading

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