Seismic fragility analysis of buckling-restrained brace-strengthened reinforced concrete frames using a performance-based plastic design method

Zhang, Yantai; Ou, Xiaoying; Shi, Yongan; Liu, Shiyu; Fan, Jingxian

doi:10.1016/j.istruc.2022.06.032

Cited by 12 publications

(5 citation statements)

References 49 publications

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“…The common method can be used without considering the fact that the shear deformation may cause damage to the structures, which cannot be entirely captured during seismic analyses when greater deformation occurs on the structures. More specifically, θ max = 5.0% was taken as the criterion of collapse for the structures in some studies [30]. It can be observed in the 50% fractile IDA curves that, when θ max reaches 5.0%, S a (T 1 , 5%) for the model without considering the axial-shear-bending interaction of RC columns increased by 28.3%, corresponding to that for the model considering the axial-shear-bending interaction of RC columns.…”

Section: The Results Of the Incremental Dynamic Analysismentioning

confidence: 99%

“…Based on FEMA350, S a (T 1 , 5%) and θ max as the intensity measure (IM) and damage measure (DM) values, respectively, were used to assess the collapse resistance capacity of the infilled RC frames [30]. The value of θ max = 0.05 and the slope of the IDA curve attained a 20% initial slope gradient constituting the collapse criterion [31][32][33][34].…”

Section: Assessment Of Collapse Resistance Capacitymentioning

confidence: 99%

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The Seismic Performance and Global Collapse Resistance Capacity of Infilled Reinforced Concrete Frames Considering the Axial–Shear–Bending Interaction of Columns

et al. 2022

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This paper presents a mechanism and method for simulating the axial–shear–bending interaction of a reinforced concrete (RC) column. The three-dimensional model of a multi-story infilled RC frame was modeled using the OpenSees software. Static pushover and nonlinear dynamic analyses under fortification and rare earthquakes were conducted using the model. Finally, based on the incremental dynamic analyses of 22 suites of ground-motion records, the global collapse resistance capacity of the infilled RC frame was evaluated using the evaluation method of a normal distribution. The analytical results show that the axial–shear–bending interaction is a key factor that affects the seismic response of infilled RC frames. Under the fortification earthquake condition, no obvious damage to physical structures was evident; the influence was relatively minor. However, under the condition of a rare earthquake, severe damage to physical structures was evident, resulting in the underestimation of the lateral inter-story drift ratio, while the degradation rates of the load capacity and global collapse resistance capacities for the infilled concrete frames were highly overestimated when the axial–shear–bending interaction was not considered.

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Section: The Results Of the Incremental Dynamic Analysismentioning

confidence: 99%

Section: Assessment Of Collapse Resistance Capacitymentioning

confidence: 99%

The Seismic Performance and Global Collapse Resistance Capacity of Infilled Reinforced Concrete Frames Considering the Axial–Shear–Bending Interaction of Columns

et al. 2022

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“…[13][14][15] When the original RC frame and the strengthened member bore the external load together, the strengthened member could bear most of the earthquake action, which greatly reduced the load borne by the original frame. [16][17][18][19] The failure mode of the strengthened RC frame was bending failure, which avoided brittle failure of beam-column joints under strong earthquakes. 20,21 Relevant scholars had provided corresponding theories and calculation methods for the seismic performance of strengthened RC frame structures.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the overall structural strengthening of the frame, steel sections worked well in concert with RC frames, which could significantly improve the bearing capacity, lateral stiffness and ductility of the seismically damaged frames 13–15 . When the original RC frame and the strengthened member bore the external load together, the strengthened member could bear most of the earthquake action, which greatly reduced the load borne by the original frame 16–19 . The failure mode of the strengthened RC frame was bending failure, which avoided brittle failure of beam‐column joints under strong earthquakes 20,21 …”

Section: Introductionmentioning

confidence: 99%

Analysis of the influence on structural seismic performance by the composite reinforcement method

Chu

et al. 2023

Structural Concrete

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This paper proposed three composite strengthening methods for repairing seismic‐damaged RC frames to restore their seismic capacity. Combined with the damage characteristics and failure mode of the frame under the earthquake action, the local strengthening of the column adopts the angle steel and gusset plate, and then the whole frame is strengthened by the inclined brace, the thin‐walled steel plate and the V‐shaped buckling restrained brace (BRB), respectively. Through the cyclic loading test, the main seismic indexes of the strengthened specimen, including hysteresis curve, skeleton curve, ductility, energy dissipation capacity, and stiffness degradation, are studied. The influence of different strengthening methods on the seismic performance of the seismic‐damaged specimens is analyzed. The results show that the seismic performance of strengthened specimens is significantly improved, and the bearing capacity, ductility, and energy dissipation capacity are increased by 2.58–5.57, 1.05–1.24, and 7.67–15.87 times, respectively. The thin‐walled steel plate shear wall and the inclined brace are destroyed at first during loading to effectively delay the premature destruction of the main frame. The composite strengthening method makes the original frame realize the failure mechanism of “strong joint weak member, strong column weak beam” under strong earthquake action. The strengthened specimen satisfies the seismic requirement and has good seismic performance. The seismic performance of the frame strengthened with the V‐shaped BRB is better than that of the other two strengthening methods. Based on the test date, the formula for calculating the shear‐bearing capacity of the beam end is presented.

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“…In recent decades, major earthquakes occurring around the world have caused severe damage and even collapse to structures [1][2][3][4]. Serious damage to the structural components and larger residual displacement of entire structures have caused huge economic losses [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation of Self-Centering Prestressed Concrete Frame Structures with Variable Friction Dampers

Huang,

Qian,

Meng

et al. 2023

Buildings

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To enhance the structural stiffness and energy-dissipating capacity after the decompression of beam-to-column connections for self-centering prestressed concrete (SCPC) frames, this study presents the seismic performance of a new type of SCPC frame with variable friction dampers (VFDs). The structure is characterized by a third stiffness and a variable energy-dissipating capacity. A 5-story and an 8-story VFD-SCPC frame were selected as the analytical cases, and their numerical models were built based on OpenSees 3.3.0 finite-element software. Sixteen ground-motion records were selected as excitations for the analyses, and the influence of the second stiffness and the third stiffness for the VFD-SCPC connections, as well as the second activation for VFD, on the seismic performance of the structures, was studied. The results showed that increasing the stiffness (number) of prestressed strands and their distance to the center of the beam section can obviously increase the second stiffness of the structures, thus decreasing their displacement, while the distribution mode of inter-story drift along the building’s height cannot be changed. Increasing the third stiffness of the connections (the angle of slope sliding parts and the stiffness for the combination of disc springs) can effectively reduce the deformation of the structures under MCE (maximum-considered earthquakes) seismic levels and improve the energy-dissipation capacity of structures significantly. The premature secondary activation of VFD can enhance the loading capacity and energy-dissipation capacity of structures under both DBE (design-basis earthquakes) and MCE seismic levels, and reduce the inter-story drift of structures effectively.

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Seismic fragility analysis of buckling-restrained brace-strengthened reinforced concrete frames using a performance-based plastic design method

Cited by 12 publications

References 49 publications

The Seismic Performance and Global Collapse Resistance Capacity of Infilled Reinforced Concrete Frames Considering the Axial–Shear–Bending Interaction of Columns

The Seismic Performance and Global Collapse Resistance Capacity of Infilled Reinforced Concrete Frames Considering the Axial–Shear–Bending Interaction of Columns

Analysis of the influence on structural seismic performance by the composite reinforcement method

Parametric Investigation of Self-Centering Prestressed Concrete Frame Structures with Variable Friction Dampers

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