Assessment of reduced beam section (RBS) moment connections subjected to cyclic loading

Sofias, Christos; Pachoumis, D.T.

doi:10.1016/j.jcsr.2020.106151

Cited by 21 publications

(10 citation statements)

References 16 publications

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“…In Europe, on the other hand, RBS has not been a prevalent field of study until the last decade [189], even if it had some of the earlier, pre-Northridge, applications [190].…”

Section: Bolted Connections In Reduced Beam Sectionsmentioning

confidence: 99%

Seismic Design of Bolted Connections in Steel Structures—A Critical Assessment of Practice and Research

et al. 2022

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The importance of connections in steel structures is paramount, not only because it greatly influences the cost of construction and provides room for innovations, but also due to the connections’ impact on global structural behaviour. Therefore, research into innovative connections for seismic applications and related design criteria has significantly grown in recent years. However, it has been pursued mostly on local—connection or frame—levels, leaving the system analysis and code compliance levels with a meagre investigation. Moreover, less than 1% of published papers concerning steel connections and earthquake engineering are review articles. To overcome this gap, this systematic review of more than 240 references, including scientific contributions and design codes in the field aimed to cover both recent research and current shortcomings in practice and regulations. It has been found that European design rules updated to a fully performance-based design philosophy is imminent and is deemed to bring pre-qualified joints and increased complexity. Design rules have been systematized, and current hindrances have been highlighted. A deeper look into research needs and trends showed that investigations in connections for concentrically X braced frames are still a necessity, while developments in self-centring and replaceable connections as well as in simple solutions for increasing damping are expected to modify how joints are designed, as soon as semi-rigid and partial strength connections are more easily allowed by design codes.

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“…In Europe, on the other hand, RBS has not been a prevalent field of study until the last decade [189], even if it had some of the earlier, pre-Northridge, applications [190].…”

Section: Bolted Connections In Reduced Beam Sectionsmentioning

confidence: 99%

Seismic Design of Bolted Connections in Steel Structures—A Critical Assessment of Practice and Research

et al. 2022

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“…The stiffness and behavior of the classic bolted joints have already been widely studied in a large number of research works [ 12 , 13 , 14 , 15 , 16 , 17 ], various studies have also been carried out on dynamic stress assessment of bolted joints [ 18 , 19 , 20 , 21 ], but studies about clamped joints are still pending. In addition, this type of joint and its calculation is already included in various standards, such as the Eurocode 3 [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…This variation affects the joint's moment rotation diagram, thereby causing a variation of the joint's bending moment absorption capacity and a variation of the structure's stiffness compared to when the joints are fully rigid. The stiffness and behavior of the classic bolted joints have already been widely studied in a large number of research works [12][13][14][15][16][17], various studies have also been carried out on dynamic stress assessment of bolted joints [18][19][20][21], but studies about clamped joints are still pending. In addition, this type of joint and its calculation is already included in various standards, such as the Eurocode 3 [10,11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Stiffness of Clamped Joints versus Bolted Joints in Steel Structures by Means of Accelerometers and Shaking Table Tests

Cabaleiro

Moutinho

González-Gaya

et al. 2021

Sensors

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This work analyzes the difference in stiffness in a steel laboratory structure using clamped joints or bolted joints and analyzes if the stiffness varies in the same way when the frame is subjected to external dynamic loads that bring the joint materials to their yield strength. To make this comparison, the differences between clamp joint and bolted joint were evaluated using a novel methodology based on the analysis of the structure’s natural frequencies from accelerometers. To perform this comparison, several laboratory tests were carried out on a frame made by clamped joints and the same frame made by bolted joints, using a set of tests on a medium-scale shake table for this purpose. The results achieved have verified the methodology used as adequate.

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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%

“…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%

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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Assessment of reduced beam section (RBS) moment connections subjected to cyclic loading

Cited by 21 publications

References 16 publications

Seismic Design of Bolted Connections in Steel Structures—A Critical Assessment of Practice and Research

Seismic Design of Bolted Connections in Steel Structures—A Critical Assessment of Practice and Research

Analysis of Stiffness of Clamped Joints versus Bolted Joints in Steel Structures by Means of Accelerometers and Shaking Table Tests

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

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