Cyclic Performance of Braces with Different Support Connections in Special Concentrically Braced Frames

Patra, Pratik; Kumar, Pawan; Sahoo, Dipti Ranjan

doi:10.4028/www.scientific.net/kem.763.694

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…They used an elliptical end distance instead of a linear one and found that the elliptical end distance of 8tp provided the highest ductility and deformation capacity, consequently delaying and limiting failure in welds or braces. Patra et al [19], in 2018, conducted a series of experimental and numerical studies to investigate the effect of brace end connection type on brace behavior. They used a gusset-knife plate for out-of-plane rotation and a thick plate for in-plane rotation of the brace.…”

Section: Fig 1 Conventional Configurations Of Concentrically Braced F...mentioning

confidence: 99%

Seismic Behavior Assessment of Special Concentrically X-Braced Frame with Through Gusset Plate

Asghari,

Hosseini

2024

Preprint

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Concentrically braced frames exhibit adequate stiffness against lateral loads. However, a critical issue with these frames lies in the connection between the brace and beam/column. The compressive and tensile forces in the braces induce significant shear at the end of the beam, leading to yielding of the beam and failure of the connection to the column. Additionally, in many cases, welds at the edge of the gusset plate to the beam experience premature failure due to stress concentration before brace yielding or buckling. In this study, it is proposed to replace the I-shaped beam with a double channel beam (2-UNP) and to allow the gusset plate to pass continuously through the beam. Consequently, in consecutive stories, there will be a continuous connection plate passing through. The research results demonstrate that in this configuration, the stress level in the beam web, connection of the beam to the column, and weld at the edge of the connection plate are significantly reduced. In frames with through gusset plates, as a portion of the brace force is transferred through the connection plate passing through the U-shaped beam, less force is absorbed by the weld, preventing premature brace yielding or buckling before weld failure. Furthermore, due to increased allowable drift in frames with through gusset plate, the ductility of the frame enhances compared to frames with a conventional gusset plate.

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Section: Fig 1 Conventional Configurations Of Concentrically Braced F...mentioning

confidence: 99%

Seismic Behavior Assessment of Special Concentrically X-Braced Frame with Through Gusset Plate

Asghari,

Hosseini

2024

Preprint

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“…Reinforcement plate of sizes 10 mm thickness and dimension 40x130 mm was used on both side as well as on both the end of the connections. In case of outof-plane buckling (OOPB) connections, the dimension of the gusset plate mostly depends on clearance for which it is design for [15,16]. The interface of the connection of the sub-assemblage system was design using the AISC 341-16 [12].…”

Section: Details Of the Test Programmentioning

confidence: 99%

Experimental Investigation of Seismic Vulnerability of Braces under Hazard Consistent loading sequences

Patra,

Sahoo,

Jain

2023

ce papers

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In the last ten years, Chile and Japan have experienced several subduction earthquakes that lasted for extended periods of time. These occurrences have emphasized the need for a thorough examination of how the duration of ground motion impacts the performance of the components of the lateral load resisting system. In the present study, three large‐scale experiments were conducted on the wide‐flange brace member to evaluate the seismic vulnerability of the braces under the hazard consistent loading protocol. The loading sequences consider in the study are standard symmetric cyclic loading sequences, collapse‐consistent loading sequences representing subduction zone tension dominated and collapse‐consistent loading sequences representing subduction zone compression dominated. The subassemblage test‐set‐up was taken in the study to consider the effect of the end‐protect zone on the seismic assessments of the brace members. The evolution of strain at the mid‐section of the brace member is observed to be higher in case of the standard loading sequences as compared to the subduction zone loading sequences. The post yielding stiffness and the collapse resistance of the brace member under the subduction zone earthquake are present. The damage state of the open section brace member and evolution of the local bucking at the mid of the brace member were discussed. It is observed that open section delays the accumulation of strain at brace member and delay the fracture initiation. The ductility of the different brace members is compared to highlight the influence of the cross‐section properties of the brace on the ductility of the braced system.

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“…[8]. The design modification was carried out such that secondary hinges will form in the knife plate, and gusset plate was designed to remain elastic [9][10][11][12].…”

Section: Balanced Design Procedures (Bdp)mentioning

confidence: 99%

“…demand based on the type of the connection [5] provided to the system. The connection of the SCBF system is generally divided into three types:…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Ductility of Bracing Members

Patra¹,

Sahoo²,

Jain³

2021

ce papers

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In earthquake‐prone region, concentrically braced frames (CBFs) are used as lateral load resistance systems and prevents damage in structures. Special concentrically braced frames (SCBFs) are special type of CBFs system which is designed for higher level of displacement ductility and energy dissipation. In case of SCBF system, the connections are designed to undergo inelasticity which helps in dissipating the energy of the system. Two types of the connections that are used in the SCBF system are out‐of‐plane buckling (OOPB) connection and in‐plane buckling (IPB) connection. The latter is a newly developed connection for the SCBF system to prevent out‐of‐plane buckling of the braces which minimizes the damage of the non‐structural components of the building. In the present study, a state‐of‐the‐art comparison of the IPB and OOPB brace system were done keeping slenderness ratio and compactness ratio constant. Large‐scale tests were conducted on the two type of connections. Elliptical clearance of eight‐time the thickness of the gusset plate was used for the OOPB braced system. Linear clearance of three times the thickness of the knife plate was used for the IPB braced system. The parameters that were compared to measure the efficiency of the connections were displacement ductility, cumulative energy ductility and failure mechanism. It is found that the OOPB brace system performs better as compared to the IPB brace system keeping all other parameters constant. The reasons for the poor performance of the IPB brace system were discussed.

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Cyclic Performance of Braces with Different Support Connections in Special Concentrically Braced Frames

Cited by 7 publications

References 4 publications

Seismic Behavior Assessment of Special Concentrically X-Braced Frame with Through Gusset Plate

Seismic Behavior Assessment of Special Concentrically X-Braced Frame with Through Gusset Plate

Experimental Investigation of Seismic Vulnerability of Braces under Hazard Consistent loading sequences

Experimental Evaluation of Ductility of Bracing Members

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