Abstract:This paper presents the design and experimental investigation of a miniature buckling-restrained brace (MBRB) which can act as a hysteretic damper to dissipate energy when subjected to inelastic axial deformations. The MBRB is similar to a buckling restrained brace (BRB) with a yielding steel core plate restrained from buckling by a grouted restraining tube. The MBRBs, however, are designed to have shorter lengths, smaller steel core dimensions, and smaller yield capacity as compared to a typical BRB. As a res… Show more
“…Both the force-deformation characteristic and the damage model of BRKB were used in the subsequent full building analysis.Figure 11.Calibration of the BRKB characteristics (subassemblage cyclic test by Junda et al (2018)). Figure 12.Calibration of the BRKB characteristic (uniaxial cyclic test by Maurya et al (2016)). …”
Section: Performance Evaluation Of Example Structuresmentioning
confidence: 99%
“…Prior to carrying out the full building analysis, the BRKB and damage model were calibrated using existing test results. The force-deformation characteristic of BRKB was calibrated by the subassemblage test by Junda et al (2018) and uniaxial test by Maurya et al (2016). The BRKB was modeled as an inelastic bar with end hinges.…”
Section: Model Calibration and Performance Evaluationmentioning
A buckling-restrained knee-braced frame (BRKBF) is an efficient structural system utilizing short buckling-restrained braces (BRBs) as knee bracing elements. Because of the shorter yielding core length compared to those of conventional BRBs, one of the key parameters concerning the performance of this system is the low cycle fatigue cumulative damage of the BRBs. This paper presents a seismic design method considering the cumulative damage, performance evaluation, and collapse assessment of 3-story, 6-story, and 9-story archetype BRKBFs. An energy-based plastic design method was utilized to design the example frames. The frames were then evaluated by nonlinear static analysis and multiple-stripe analysis (MSA). The results indicated that BRKBs were able to accommodate seismic motions with limited damage. The validity of the design methodology considering cumulative damage was also confirmed.
“…Both the force-deformation characteristic and the damage model of BRKB were used in the subsequent full building analysis.Figure 11.Calibration of the BRKB characteristics (subassemblage cyclic test by Junda et al (2018)). Figure 12.Calibration of the BRKB characteristic (uniaxial cyclic test by Maurya et al (2016)). …”
Section: Performance Evaluation Of Example Structuresmentioning
confidence: 99%
“…Prior to carrying out the full building analysis, the BRKB and damage model were calibrated using existing test results. The force-deformation characteristic of BRKB was calibrated by the subassemblage test by Junda et al (2018) and uniaxial test by Maurya et al (2016). The BRKB was modeled as an inelastic bar with end hinges.…”
Section: Model Calibration and Performance Evaluationmentioning
A buckling-restrained knee-braced frame (BRKBF) is an efficient structural system utilizing short buckling-restrained braces (BRBs) as knee bracing elements. Because of the shorter yielding core length compared to those of conventional BRBs, one of the key parameters concerning the performance of this system is the low cycle fatigue cumulative damage of the BRBs. This paper presents a seismic design method considering the cumulative damage, performance evaluation, and collapse assessment of 3-story, 6-story, and 9-story archetype BRKBFs. An energy-based plastic design method was utilized to design the example frames. The frames were then evaluated by nonlinear static analysis and multiple-stripe analysis (MSA). The results indicated that BRKBs were able to accommodate seismic motions with limited damage. The validity of the design methodology considering cumulative damage was also confirmed.
“…erefore, the earthquake researchers have developed an innovative type of devices, such as buckling-restrained braces to immensely dissipate the energy from the earthquake action [6,7]. e buckling-restrained brace (BRB) is mainly composed of steel bracing inner core, outer covering restraint component, and nonbonding material or gap arranged between those two components [8][9][10]. Compared with ordinary braces, the enormous difference lies in that the inner core component reaches the full section yield under compression or tension and achieves the purpose of energy dissipation through the yield hysteresis due to the constraint action of the outer covering component for the bucklingrestrained braces.…”
To investigate the seismic performance of buckling-restrained braces under the earthquake action, the shaking table test with a two-story 1/4 scale model is carried out for the ordinary pure steel frame and the buckling-restrained bracing steel frame with low-yield-point steel as the core plate. The failure modes, dynamic characteristics, acceleration response, interstory drift ratio, strain, shear force, and other mechanical properties of those two comparative structures subjected to different levels of seismic waves are mainly evaluated by the experiment. The test results show that under the action of seismic waves with different intensities, the apparent observations of damage occur in the pure frame structure, while no obvious or serious damage in the steel members of BRB structure is observed. With the increase in loading peak acceleration for the earthquake waves, the natural frequency of both structures gradually decreases and the damping ratio gradually increases. At the end of the test, the stiffness degradation rate of the pure frame structure is 11.2%, while that of the buckling-restrained bracing steel frame structure is only 5.4%. The acceleration response of the buckling-restrained bracing steel frame is smaller than that of the pure steel frame, and the acceleration amplification factor at the second story is larger than that at the first story for both structures. The average interstory drift ratios are, respectively, 1/847 and 1/238 for the pure steel frame under the frequent earthquake and rare earthquake and are 1/3000 and 1/314 for the buckling-restrained bracing steel frame, which reveals that the reduction rate of lateral displacement reaches a maximum of 71.71% after the installation of buckling-restrained brace in the pure steel frame. The strain values at each measuring point of the structural beam and column gradually increase with the increase of the peak seismic acceleration, but the strain values of the pure steel frame are significantly larger than those of the buckling-restrained bracing steel frame, which indicates that the buckling-restrained brace as the first seismic line of defense in the structure can dramatically protect the significant structural members. The maximum shear force at each floor of the structure decreases with the increase in height, and the shear response of the pure frame is apparently higher than that of the buckling-restrained bracing structure.
“…In practical engineering, BRBs are widely used in concrete structures, and the failure mode of a concrete structure equipped with BRBs has attracted the attention of many researchers [6][7][8][9][10]. Wu et al [11] investigated the seismic behaviour of a concrete frame with BRBs by performing a pseudo-static test; the results indicate that the RC frame is damaged earlier than BRBs.…”
In this paper, a new type of buckling-restrained brace characterized by a variable cross-section core (BRB-VCC) is proposed and investigated. The practical design equations of the BRB-VCC are derived based on mechanical and mathematical theories. Six specimens are designed and tested to clarify the mechanical behaviours of the BRB-VCC and to validate the reliability of the proposed equations. The test results show that (1) none of the specimens buckle under compression, as expected, and their ductilities and energy dissipation capacities are satisfactory; (2) the derived formulas are reliable and can be conveniently used in engineering practice; and (3) the yielding displacement of the BRB-VCC is approximately 70% that of the traditional TJ-1 buckling-restrained brace (BRB-TJ-1), which may yield earlier than the BRB-TJ-1 in concrete structures under the action of an earthquake.
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