“…While this works well under severe earthquake, it may not be so effective under small earthquake, such as cases in Australia. To overcome such a problem, hybrid passive devices have been developed in which viscoelastic materials such as rubber (provides damping) was combined with steel plates (provide energy dissipation) (Marshall and Charney, 2010a, 2010b; Rahnavard et al, 2020). As shown in Figure 12(a), high damping rubber elements were combined with two steel plates and a steel brace core to form a hybrid BRB system.…”
Section: Effect Of Materials Selection On Buckling Restrained Braces ...mentioning
confidence: 99%
“…The restraining unit which consists of rubber and steel plates failed to prevent the buckling failure of the core. The hysteresis loop of the hybrid passive control device (HPCD) was shown in Figure 12(c), which indicated the reduced effectiveness of the damper.Figure 12.Hybrid passive control device (Marshall and Charney, 2010a, 2010b). (a) Section view of damper element, (b) Disassembled BRB element, (c) Cyclic hysteresis loops of HPCD and damper.…”
Section: Effect Of Materials Selection On Buckling Restrained Braces ...mentioning
Passive energy dissipation devices are a widely accepted solution used to improve the response of the structures under seismic conditions. While several types of passive energy dissipation elements have been proposed for replaceable elements, buckling restrained braces (BRB) was one of the most effective replaceable elements which has been used to retrofit frame structures in the past few years. A traditional BRB consists of a steel brace core with a cruciform cross section that is surrounded by a stiff steel tube (restraining unit) and unbonded materials to ensure the brace to move freely. The region between the tube and brace is filled with concrete-like materials. In recent years, a significant amount of research has been carried out on new types of BRBs which are more efficient and inexpensive. This paper presents an overview of recent advances in the development of BRB materials and buckling mechanism, with an emphasis on the material development for the restraining unit. The application of fibre-reinforced polymer (FRP) as restraining unit in BRB is highlighted.
“…While this works well under severe earthquake, it may not be so effective under small earthquake, such as cases in Australia. To overcome such a problem, hybrid passive devices have been developed in which viscoelastic materials such as rubber (provides damping) was combined with steel plates (provide energy dissipation) (Marshall and Charney, 2010a, 2010b; Rahnavard et al, 2020). As shown in Figure 12(a), high damping rubber elements were combined with two steel plates and a steel brace core to form a hybrid BRB system.…”
Section: Effect Of Materials Selection On Buckling Restrained Braces ...mentioning
confidence: 99%
“…The restraining unit which consists of rubber and steel plates failed to prevent the buckling failure of the core. The hysteresis loop of the hybrid passive control device (HPCD) was shown in Figure 12(c), which indicated the reduced effectiveness of the damper.Figure 12.Hybrid passive control device (Marshall and Charney, 2010a, 2010b). (a) Section view of damper element, (b) Disassembled BRB element, (c) Cyclic hysteresis loops of HPCD and damper.…”
Section: Effect Of Materials Selection On Buckling Restrained Braces ...mentioning
Passive energy dissipation devices are a widely accepted solution used to improve the response of the structures under seismic conditions. While several types of passive energy dissipation elements have been proposed for replaceable elements, buckling restrained braces (BRB) was one of the most effective replaceable elements which has been used to retrofit frame structures in the past few years. A traditional BRB consists of a steel brace core with a cruciform cross section that is surrounded by a stiff steel tube (restraining unit) and unbonded materials to ensure the brace to move freely. The region between the tube and brace is filled with concrete-like materials. In recent years, a significant amount of research has been carried out on new types of BRBs which are more efficient and inexpensive. This paper presents an overview of recent advances in the development of BRB materials and buckling mechanism, with an emphasis on the material development for the restraining unit. The application of fibre-reinforced polymer (FRP) as restraining unit in BRB is highlighted.
“…The gap is the key to the initial phase with the rubber device providing damping for small displacements. The HPCD is the only device of the four hybrid systems that has been physically developed and tested . Figure shows schematic drawings of the HPCD and the hysteresis loop.…”
SUMMARYThe concept of the hybrid passive control system is studied analytically by investigating the seismic response of steel frame structures. Hybrid control systems consist of two different passive elements combined into a single device or system. The hybrid systems investigated in this research consist of a ratedependent damping device paired with a rate-independent energy dissipation element. The innovative configurations exploit individual element strengths and offset their weaknesses through multiphased behavior. A nine-story, five-bay steel moment-frame was used for the analysis. Six different seismic resisting systems were analyzed and compared. The conventional systems included a special momentresisting frame (SMRF) and a dual SMRF-buckling-restrained brace (BRB) system. The final four configurations are hybrid passive systems. The different hybrid configurations utilize a BRB and either a high-damping rubber damper or viscous fluid damper. The analyses were run in the form of an incremental dynamic analysis. Several damage measures were calculated, including maximum roof drift, base shear, and total roof acceleration. The results demonstrate the capability of hybrid passive control systems to improve structural response compared with conventional lateral systems and to be effective for performance-based seismic design. Each hybrid configuration improved some aspect of structural response with some providing benefits for multiple damage measures. The multiphased nature provides improved response for frequent and severe seismic events.
“…On the other hand, under a moderate earthquake, it is not economically justifiable to designing a structure which remains elastic [5][6][7]. So, in order to dissipate earthquake energy, the structure should experience inelastic behavior [8][9][10][11][12][13][14][15]. Extensive research has been performed to increase the ductility of concentric braces [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”
This paper treats a different type of bracing by using circular bracing elements called OGrid-H. The goal of using circular shape is to obtain more ductility, high performance and appropriate stiffness and limit the buckling of braces, and at the same time in order to realize a solution that is interesting from the architectural point of view. In order to study the seismic behavior of OGrid-H members, a numerical finite element analysis of 9 OGrid-H models with different section members is established through ABAQUS finite element software subjected to cyclic loadings, which failure modes, load capacity, nonlinear displacement, ductility factor, vibration period, stiffness and energy absorption of models is obtained, and the comparison between outputs of models leads to obtaining the model with the best sections which have higher performance than the others. In order to investigate the OGrid-H connections, five changes are applied on connections, which the results showed that three changes had the greatest influence, which caused to increase load bearing as the amount of 22.88%.
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