Cyclic tests of all-steel web-restrained buckling-restrained brace subassemblages

Judd, Johnn P.; Marinovic, Igor; Eatherton, Matthew R.; Hyder, Clifton D.; Phillips, Adam R.; Tola, Adrian Tola; Charney, Finley A.

doi:10.1016/j.jcsr.2016.06.007

Cited by 41 publications

(11 citation statements)

References 17 publications

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“…Several researchers have proposed all-steel BRBs [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ] over conventional concrete-filled BRBs for various advantages, such as lighter weight, shorter fabrication time, and, in some cases, disassembly for maintenance and inspection [ 3 ]. Some of the common cross-sectional shapes of all-steel BRBs include H-section core encased in a square or circular casing, cruciform core encased in a square casing, circular tube core encased in a circular tube casing, and flat rectangular core plate sandwiched between bolted casing plates [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Cyclic Load Test and Finite Element Analysis of NOVEL Buckling-Restrained Brace

et al. 2020

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Compared to concrete or mortar-filled Buckling-Restrained Braces (BRBs), all-steel BRBs provide weight and fabrication time reductions. In particular, all-steel buckling braces with H-section cores are gaining attention in cases where large axial strength is required. In this paper, an all-steel BRB, called NOVEL (Noise, CO2 emission, Vibration, Energy dissipation and Labor), is presented. It comprises an H-section core encased in a square casing, and its behavior was studied through full-scale subassembly and brace tests, followed by a finite element parametric study. Two failure modes were observed: global buckling and flange buckling of the H-section core, which occurred in test specimens with Pcr/Py ratios of 1.68 and 4.91, respectively. Global buckling occurred when the maximum moment in the casing reached its yielding moment, although the test specimens had sufficient stiffness to prevent global buckling. Failure by core flange buckling occurred at a core strain of 1.2%. The finite element parametric study indicated that adjusting the width-to-thickness ratio of the core flange is more feasible than stiffening the flange or adjusting the unconstrained-length end stiffeners. The value of 5.06 was the minimum flange slenderness ratio that provided a stable hysteresis to the end of the loading protocol of the American Institute of Steel Construction standard.

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Section: Introductionmentioning

confidence: 99%

Cyclic Load Test and Finite Element Analysis of NOVEL Buckling-Restrained Brace

et al. 2020

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“…proposed BRBs with all-steel composition and conducted experimental and numerical studies (Guo et al 2016;Guo et al 2017a, b;Hosseinzadeh and Mohebi 2016;Jia et al 2017;Judd et al 2016;Mirtaheri et al 2017). The all-steel BRB is mainly characterized by a steel core with a circular section or H-section and a restraining member of a circular or square steel tube.…”

Section: Nomenclaturementioning

confidence: 99%

Cyclic experiments and global buckling design of steel-angle-assembled buckling-restrained braces

Tong

Zhang

Guo

et al. 2022

Bull Earthquake Eng

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Compared with traditional BRB, the steel-angles-assembled buckling-restrained brace (SAA-BRB) is an innovative BRB with light-weight, accurate control of the geometrical dimensions, easy installation and convenient disassembly. The SAA-BRB is composed of an external restraining system and a cruciform-sectional inner core. The external restraining system is assembled by four steel angles with the connection of high-strength bolts, and the spacers are installed between the inner core and the restraining system. In this study, the hysteretic behavior of SAA-BRB was investigated by experiments and finite element (FE) simulations. Firstly, three SAA-BRB specimens with different restraining ratios were tested under cyclic loads to investigate the hysteretic performance. It was found that all specimens exhibited stable responses and satisfactory energy-dissipating capabilities during the whole loading process. Then, a refined FE model was established, and its validity in predicting the hysteretic responses of SAA-BRB was verified by the experiments. Moreover, based on the yielding criteria of the outmost fiber for the restraining member section, a design formula for the restraining ratio requirements to avoid global buckling of the SAA-BRB was deduced.Finally, extensive parametric analysis was conducted to verify the accuracy of the design formula by changing the geometric dimensions (the restraining ratio) of models. It was found that the proposed formula for the restraining ratio requirement could lead to a conservative prediction with reasonable accuracy, thus providing valuable references for global buckling design of SAA-BRBs in engineering practice.

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“…Notably, the influence of the weld toes on the BRB low-cycle failure could not be quantified, although the tensile fracture of the core was observed because of the welds between the stiffeners and the yield portion of the core. [20,27,32] To improve the low-cycle fatigue performance of the BRB, the weld toes of the stiffeners were specially smoothed, as shown in Figure 1e.…”

Section: Corementioning

confidence: 99%

“…The all‐steel integral BRB has the advantages of good mechanical properties, convenient manufacturing, and light weight, which has been applied more and more. [ 20 ]…”

Section: Introductionmentioning

confidence: 99%

“…The all-steel integral BRB has the advantages of good mechanical properties, convenient manufacturing, and light weight, which has been applied more and more. [20] The restraining system of an integral BRB is a whole, and the yield segment of the core is surrounded by the restraining system. After an earthquake, it is difficult to quickly assess the deformation state of the BRB core, and it is impossible to efficiently and effectively determine the need for replacement.…”

mentioning

confidence: 99%

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Experimental study and numerical simulation of all‐steel buckling‐restrained brace with distributed inspection windows

Wan

Xie

et al. 2022

Structural Design Tall Build

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This paper presents a novel all-steel seismic-resistant, buckling-restrained brace (BRB) which can be easily detached from its steel core for post-seismic inspections.This allows inspectors to quickly determine if the BRB needs to be replaced to reduce the impact of seismic aftershocks. The weld toes of brace stiffeners were specially smoothed to reduce the residual stress and stress concentration, thereby improving the low-cycle fatigue performance of the brace. Two identical restraining units were connected by high-strength bolts. A small air gap was provided by annular gaskets between the core and the restraining system to allow for lateral expansion of the core plate under compression. Five specimens were tested under different cyclic loading protocols to investigate the performance. The hysteretic behavior, compression strength adjustment factor, equivalent viscous damping ratio, failure modes, and deformation of the restraining system were analyzed. The multi-wave buckling deformation of the core was studied in detail to provide a basis for the accurate calculation of the number of contact points. Finite element analyses were performed to compare the response with test results, which proved the structure of the novel BRB to be reasonable except for the compression strength adjustment factor of some specimens, which was greater than 1.3. A damage assessment method was proposed to evaluate the working status of the newly designed BRB after an earthquake.

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Cyclic tests of all-steel web-restrained buckling-restrained brace subassemblages

Cited by 41 publications

References 17 publications

Cyclic Load Test and Finite Element Analysis of NOVEL Buckling-Restrained Brace

Cyclic Load Test and Finite Element Analysis of NOVEL Buckling-Restrained Brace

Cyclic experiments and global buckling design of steel-angle-assembled buckling-restrained braces

Experimental study and numerical simulation of all‐steel buckling‐restrained brace with distributed inspection windows

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