Conceptual numerical investigation of all-steel Tube-in-Tube buckling restrained braces

Heidary-Torkamani, Hamid; Maalek, Shahrokh

doi:10.1016/j.jcsr.2017.09.022

Cited by 32 publications

(12 citation statements)

References 14 publications

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“… When buckling mode shapes are utilized for initial imperfection, the amplitude of the mode shape should be less than the gap size of each side; otherwise, the model will lead to initial convergence problems. Furthermore, increasing initial imperfection increases computational cost and leads to convergence problems, which were also reported in [14,15].…”

Section: Discussionmentioning

confidence: 84%

“…Avci-Karatas et al [16] used a friction coefficient of 0.03 for the interaction between the steel core and concrete encasing where a teflon pad was utilized. Chou and Chen [13]and Heidary-Torkamani et al [15]selected friction coefficient as 0.1 for the steel core and steel encasing where grease oil was utilized. Guo et al [9] selected the friction coefficient of the steel core to steel encasing interaction as 0.1.A friction coefficient of 0.05 was utilized by Wang et al [6] for the interaction between the steel core and concrete encasing.…”

Section: Figure 1typical Buckling Restrained Bracementioning

confidence: 99%

“…Bozkurt and Topkaya [10] utilized two different gap sizes of 1 mm and 3 mm including the thickness of teflon pad for the steel core and steel encasing. Heidary-Torkamani et al [15] utilized a gap size of 6 mm between the tubed steel core and tubed steel encasing. [8] In the literature, limited studies [6,9,[12][13][14][15][16][17][18] are available on numerical modeling of BRBs.…”

Section: Introductionmentioning

confidence: 99%

“…Heidary-Torkamani et al [15] utilized a gap size of 6 mm between the tubed steel core and tubed steel encasing. [8] In the literature, limited studies [6,9,[12][13][14][15][16][17][18] are available on numerical modeling of BRBs. The reason for this can be attributed to the complexity of modeling interaction between the steel core and encasing, which leads to significant convergence problems and computational cost.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Özkılıç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Buckling restrained braces (BRBs) which are generally composed of a steel core and a encasing(buckling restrainers) are utilized to resist lateral forces in high seismic regions since BRBs exhibit high energy dissipation capacity, ductility and stiffness. The steel core carries both compressive and tensile forces. During the compression, the core starts buckling and the encasing tries to prevent this buckling. However, due to the unbonding layer/gap between the encasing and steel core, the steel core eventually buckles and contacts with the encasing. Buckling phenomenon is also associated with the initial imperfection and gap size. In this study, the effects of the initial imperfectionof steel core, gap size (1-5 mm)and friction coefficient (0.01-0.5)between the encasing and steel core on the behavior of BRBs are investigated. Pursuant to this goal, numerical analyses using a finite element tool ABAQUS were conducted. A total of 19 numerical models were developed and monotonically loaded. Initial imperfection was implemented to the models using buckling mode shapes.The results revealed that increasing gap size leads to a reduction in load-carrying capacity. It is recommended to keep gap sizes between 1 and 2 mm. On the other hand, initial imperfection does not significantly affect load-carrying capacity and global behavior. However, it was also observed that the fluctuations in load increase as the amplitude of the mode shape and gap size increase. Moreover, the friction coefficient should be kept between 0.01 and 0.05; otherwise, undesired behaviors can be observed.

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Section: Discussionmentioning

confidence: 84%

Section: Figure 1typical Buckling Restrained Bracementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Özkılıç

2021

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…In the past several decades, buckling restrained devices have been developed to enhance the bearing capacity and ductility of compression members. The typical devices are the member with a large cross-sectional dimension [9], the buckling restrained brace [10][11][12], the all-steel buckling restrained braces [13][14][15][16][17], and the sleeved column [18,19]. The buckling monitoring members [20][21][22] are considered to have more potential to be applied in spatial structures in terms of deadweight and simplify the configuration.…”

Section: Introductionmentioning

confidence: 99%

Static Behaviors and Applications of Buckling Monitoring Members with Rigid Ends

2021

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The buckling of compression members may lead to the progressive collapse of spatial structures. Based on the sleeved compression member, the buckling monitoring member is introduced to control the buckling of compression member and raise buckling alert by sensing contact between the core tube and the restraining tube. Considering the rigid connection among the members in spatial structures, the buckling monitoring member with rigid ends needs to be further analyzed. An experimental test was conducted and finite element analyses were performed with calibrated finite element models. The results indicated that the ultimate bearing capacity and post-ultimate bearing capacity of the core tube were enhanced due to the restraint from the restraining tube. The contact was successfully sensed by pressure sensor, revealing that it sensed the buckling of the core tube. Parametric studies were conducted, indicating that the core protrusion, core slenderness ratio, the gap between the core tube and restraining tube, and the flexural rigidity ratio are the key parameters affecting the bearing capacity and the failure modes of the buckling monitoring member, and some key values of parameters were proposed to obtain good bearing capacity. Based on the parametric studies, the failure modes of buckling-monitoring members are summarized as global buckling and local buckling. The stress distribution and deformation mode of buckling monitoring members are presented in the non-contact, point-contact, line-contact, reverse-contact and ultimate bearing state. The buckling monitoring member is applied in a reticulated shell by substituting the buckling members. It can effectively improve the ultimate bearing capacity of reticulated shell.

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The computational modeling for the static analysis of axially functionally graded micro-cylindrical imperfect beam applying the computer simulation

Hou

Moradi

et al. 2021

Engineering with Computers

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Conceptual numerical investigation of all-steel Tube-in-Tube buckling restrained braces

Cited by 32 publications

References 14 publications

The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

The Effects of Steel Core Imperfection, Gap Size and Friction Coefficient on the Behavior of All-Steel Buckling Restrained Braces

Static Behaviors and Applications of Buckling Monitoring Members with Rigid Ends

The computational modeling for the static analysis of axially functionally graded micro-cylindrical imperfect beam applying the computer simulation

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