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学者姓名：邱灿星
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Abstract ：
In seismic prone regions, many old bridges deserve retrofitting measures to improve their seismic resilience. The recently proposed buckling-restrained shape memory alloy (SMA) dampers, which can maintain axial resistance under low temperatures, are potential candidates for outdoor applications. However, the corresponding design method and retrofitting efficacy remain unknown. Besides, the effects arising from temperature variations and device uncertainty have not been addressed. To this end, this work proposes a performance-based retrofitting method and conducts a probabilistic evaluation for bridges retrofitted with buckling-restrained SMA dampers. The temperature-specific behavior of the damper is first described, and then a triple-column bent bridge located in Salt Lake City is selected for demonstration purposes. To unveil the seismic retrofitting efficacy, nonlinear time history analysis and fragility analysis are performed. The considered uncertainties include temperature variation, device uncertainty, and seismic intensity. The results indicate that the bridges retrofitted by the designed damper could achieve prescribed performance targets. In addition, with the variations of temperature and device, the seismic response demands are relatively stable. The damage probabilities and seismic risk are reduced by the installed dampers. Hence, the buckling-restrained SMA dampers have a reliable seismic control efficacy for bridges.
Keyword ：
Seismic retrofit Seismic retrofit Shape memory alloy Shape memory alloy Bridges Bridges Temperature effect Temperature effect Multivariate fragility Multivariate fragility
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| GB/T 7714 | Jiang, Tianyuan , Qiu, Canxing , Liu, Jiawang et al. Seismic Design and Performance Evaluation of a Triple-Column Bent Bridge Retrofitted with Buckling-Restrained Shape Memory Alloy Dampers [J]. | JOURNAL OF BRIDGE ENGINEERING , 2025 , 30 (5) . |
| MLA | Jiang, Tianyuan et al. "Seismic Design and Performance Evaluation of a Triple-Column Bent Bridge Retrofitted with Buckling-Restrained Shape Memory Alloy Dampers" . | JOURNAL OF BRIDGE ENGINEERING 30 . 5 (2025) . |
| APA | Jiang, Tianyuan , Qiu, Canxing , Liu, Jiawang , Du, Xiuli , Liu, Hang . Seismic Design and Performance Evaluation of a Triple-Column Bent Bridge Retrofitted with Buckling-Restrained Shape Memory Alloy Dampers . | JOURNAL OF BRIDGE ENGINEERING , 2025 , 30 (5) . |
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Abstract ：
Due to the relatively low damping and sharp stiffness change, friction-based self-centering dampers are less effective in controlling peak interstory drift (PID) and peak floor acceleration (PFA). To address these concerns, at least partially, this paper leverages the two activation plateaus and proposes two types of double-stage friction-based self-centering dampers. The double-stage behavior provides enhanced stiffness and energy dissipation in the second stage. As the kernel elements, the grooved friction plates or disc spring stacks are elaborately designed to realize two activation points. The configurations and working mechanisms of the dampers are described first, followed by the derivations of their analytical equations governing the force-displacement relationships. Proof-of-concept tests are conducted on two reduced-scale specimens to experimentally examine their hysteretic behaviors. The experimental observations and data meet expectations and validate the analytical equations. At the system level, a steel-braced frame is selected as the example structure for demonstrating the seismic control characteristics of the double-stage friction-based self-centering dampers, through comprehensive comparisons against the companion single-stage self-centering dampers, under earthquakes associated with three seismic hazard levels. The comparison results indicate that the double-stage friction-based self-centering dampers have superior PFA control effect under all hazard levels and better PID control effect under the maximum considered earthquake hazard level.
Keyword ：
Double-stage Double-stage Peak floor acceleration Peak floor acceleration Seismic response Seismic response Experimental test Experimental test Self-centering Self-centering
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| GB/T 7714 | Liu, Jiawang , Qiu, Canxing , Du, Xiuli et al. Double-Stage Friction-Based Self-Centering Dampers: Proof-of-Concept Tests and Seismic Control Analysis [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2025 , 151 (5) . |
| MLA | Liu, Jiawang et al. "Double-Stage Friction-Based Self-Centering Dampers: Proof-of-Concept Tests and Seismic Control Analysis" . | JOURNAL OF STRUCTURAL ENGINEERING 151 . 5 (2025) . |
| APA | Liu, Jiawang , Qiu, Canxing , Du, Xiuli , Liu, Hang . Double-Stage Friction-Based Self-Centering Dampers: Proof-of-Concept Tests and Seismic Control Analysis . | JOURNAL OF STRUCTURAL ENGINEERING , 2025 , 151 (5) . |
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Abstract ：
Partially self-centering structures are promising seismic resilient structural systems by reducing residual interstory drifts with low initial construction costs. Comprehensive studies focused on structural design and performance evaluation, but no research was conducted to investigate the design of nonstructural components in partially self-centering structures. This research focuses on developing the probabilistic spectral acceleration demands for the nonstructural design in partial self-centering structures. 320 near-fault recorded ground motions were adopted for considering the uncertainties of seismic excitations. The spectral accelerations of the light nonstructural component were obtained through comprehensive dynamic analyses. The logarithmic normal distribution can be used for describing the probabilistic distribution of floor spectra for partially self-centering structures under earthquakes, validating through the Anderson-Darling test. The influences of design parameters (including structural period, hysteretic parameters, structural damping, the ratio of the structural period to the nonstructural period, and nonstructural damping) on the probabilistic distribution of floor spectra were investigated through parametric dynamic analysis results. Artificial neural network (ANN) models were developed for predicting the probabilistic floor spectra for partially self-centering structures. The analysis results indicate that ANN models can achieve excellent accuracy with a coefficient of determination larger than 0.99. Comparative analysis results reveal that the ASCE method may underestimate the acceleration demand of light secondary systems supported by partially self-centering structures. The developed ANN models were interpreted using the shapely additive explanations. It has been found that the fundamental periods of the main structure and nonstructural components and the response modification factor show significant effects on the median and deviation of the probabilistic floor spectra for partially self-centering structures. The software FloorSpecPS was established to predict the probabilistic floor spectra for partially self-centering structures using the developed ANN models in practical application.
Keyword ：
Nonstructural components Nonstructural components Artificial neural network Artificial neural network Spectral acceleration demands Spectral acceleration demands Partially self-centering Partially self-centering Probabilistic floor spectra Probabilistic floor spectra
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| GB/T 7714 | Hu, Shuling , Qu, Bing , Qiu, Canxing et al. Probabilistic evaluation of spectral acceleration demands on light secondary systems supported by partially self-centering structures [J]. | ENGINEERING STRUCTURES , 2024 , 315 . |
| MLA | Hu, Shuling et al. "Probabilistic evaluation of spectral acceleration demands on light secondary systems supported by partially self-centering structures" . | ENGINEERING STRUCTURES 315 (2024) . |
| APA | Hu, Shuling , Qu, Bing , Qiu, Canxing , Zhang, Ruibin . Probabilistic evaluation of spectral acceleration demands on light secondary systems supported by partially self-centering structures . | ENGINEERING STRUCTURES , 2024 , 315 . |
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Abstract ：
Owing to high fatigue life, the iron-based shape memory alloy (FeSMA) buckling-restrained braces (BRBs) are emerging as a promising candidate against long-duration earthquakes. However, the corresponding analysis cannot be found. Current emphasis is paid on unveiling the seismic response differences between concentrically braced frames (CBFs) with FeSMA and steel BRBs when they are attacked by long-duration earthquakes. To directly assess the effect of earthquake duration, this paper selects a total of 90 pairs of short- and long-duration earthquake records, which are record-to-record spectrally equivalent over a wide range of fundamental periods, for nonlinear time history analysis. A benchmark six-story CBF is selected for demonstration purposes. In the numerical simulation process, the fatigue-induced damage is particularly considered. A preliminary examination is first conducted in the case study, in which a representative pair of short- and long-duration records is selected. In what followed, the statistical results from the ground motion suites are analyzed. This work not only highlights the higher failure risk of steel BRBs than FeSMA BRBs under long-duration earthquakes associated with maximum considered earthquake hazard level, but also confirms the advantages of FeSMA BRBs over steel BRBs in controlling residual deformations.
Keyword ：
iron-based shape memory alloy iron-based shape memory alloy Earthquake duration Earthquake duration fatigue fatigue buckling-restrained brace buckling-restrained brace concentrically braced frame concentrically braced frame
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| GB/T 7714 | Qiu, Canxing , Zhang, Aifang , Du, Xiuli . Comparative Analysis of Concentrically Braced Frames with FeSMA and Steel BRBs Under Long-Duration Earthquakes [J]. | JOURNAL OF EARTHQUAKE ENGINEERING , 2024 , 28 (13) : 3860-3884 . |
| MLA | Qiu, Canxing et al. "Comparative Analysis of Concentrically Braced Frames with FeSMA and Steel BRBs Under Long-Duration Earthquakes" . | JOURNAL OF EARTHQUAKE ENGINEERING 28 . 13 (2024) : 3860-3884 . |
| APA | Qiu, Canxing , Zhang, Aifang , Du, Xiuli . Comparative Analysis of Concentrically Braced Frames with FeSMA and Steel BRBs Under Long-Duration Earthquakes . | JOURNAL OF EARTHQUAKE ENGINEERING , 2024 , 28 (13) , 3860-3884 . |
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Abstract ：
Owing to superelastic behavior, shape memory alloy (SMA) has been widely utilized to develop self-centering damping devices. Recently, the authors developed a novel SMA damper, i.e. the SMA slip friction (SMASF) damper. The cyclic behavior of the SMASF damper not only depends on the hysteresis shape factors of SMA bars, but also on the coefficient of kinetic friction and the slope of the friction plates. Hence, the basic working mechanism of the SMASF damper is different from that of conventional SMA dampers. In the early work, the features of the SMASF damper have been revealed by static cyclic loading tests. However, the seismic displacement responses of this novel damper remain unknown. To this end, this paper initiates with a brief introduction of the damper, including the configuration, working mechanism, and testing results. And then, extensive seismic analyses based on single-degree-of-freedom systems were conducted. Based on the constant-strength ductility demand spectra, the displacement responses of the SMASF damper were understood through the comparisons with conventional SMA damper and friction damper. A wide range of fundamental periods, strength capacities and seismic intensity levels were considered. Further, parametric analysis was conducted to assess the effect of the hysteresis shape factors of SMA bars and the coefficient of kinetic friction and the slope of the friction plates. This study also sheds light on the force-based seismic design method for this damper.
Keyword ：
displacement displacement single-degree-of-freedom single-degree-of-freedom numerical analysis numerical analysis shape memory alloy shape memory alloy
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| GB/T 7714 | Qiu, Canxing , Bai, Muyuan , Jiang, Tianyuan . Seismic displacement response of SDOF systems with SMA slip friction dampers [J]. | SMART MATERIALS AND STRUCTURES , 2024 , 33 (1) . |
| MLA | Qiu, Canxing et al. "Seismic displacement response of SDOF systems with SMA slip friction dampers" . | SMART MATERIALS AND STRUCTURES 33 . 1 (2024) . |
| APA | Qiu, Canxing , Bai, Muyuan , Jiang, Tianyuan . Seismic displacement response of SDOF systems with SMA slip friction dampers . | SMART MATERIALS AND STRUCTURES , 2024 , 33 (1) . |
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Abstract ：
Shape-memory alloy (SMA) knee-braced frames (KBFs) are a type of seismically resilient frame buildings. Knee braces (KBs) in this system are the SMA buckling-restrained braces, which provide both self-centering and energy-dissipating capacity. SMAs are known for their noticeable thermal-mechanical property, but there remains a lack of understanding regarding the temperature effect on the seismic responses of SMA KBFs. Hence, this study aims to address this issue at both component and system levels. Cyclic loading tests were conducted on reduced-scale SMA KB specimens under five distinct ambient temperatures ranging from -20 degrees C to 20 degrees C. The experimental data were then used to quantify the relationship between the hysteretic parameters of interest and the ambient temperature. At the system level, a multistory steel frame located in Tangshan City, China, was selected as the example structure. The probability density function was built to describe the temperature variation of the selected region, and the parameters of the function were determined using the maximum likelihood estimation method. The probabilistic analytical framework that considered the temperature effect was described. Then, this work conducted seismic design at the reference temperature (20 degrees C). In what followed, within varying temperature conditions, nonlinear time-history analysis and multistripe analysis were conducted. The seismic response indexes under discrete temperature levels were compared. Finally, the temperature effect was understood by generating the joint fragility curves under various levels of temperature and seismic intensity. The findings indicated that the temperature effect on SMA KBs was noticeable. However, the temperature effect on SMA KBFs was minor, even though the extent of temperature variation was up to 60 degrees C.
Keyword ：
Seismic fragility Seismic fragility Temperature effect Temperature effect Knee-braced frame (KBF) Knee-braced frame (KBF) Shape-memory alloy Shape-memory alloy
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| GB/T 7714 | Jiang, Tianyuan , Qiu, Canxing , Liu, Jiawang . Temperature Effect on Seismic Responses of SMA Knee-Braced Frames [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2024 , 150 (10) . |
| MLA | Jiang, Tianyuan et al. "Temperature Effect on Seismic Responses of SMA Knee-Braced Frames" . | JOURNAL OF STRUCTURAL ENGINEERING 150 . 10 (2024) . |
| APA | Jiang, Tianyuan , Qiu, Canxing , Liu, Jiawang . Temperature Effect on Seismic Responses of SMA Knee-Braced Frames . | JOURNAL OF STRUCTURAL ENGINEERING , 2024 , 150 (10) . |
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Abstract ：
This paper proposes a new post-tensioned (PT) precast bridge column (PBC) with a socket connection. PT steel tendons and unbonded steel rebars provide self-centering capability and energy-dissipating capacity, respectively. Because the PT tendons are off-site anchored, they can effectively shorten the on-site working time and improve the safety and tolerance of construction. After describing the configuration and mechanism of the PBC, the analytical equations governing its cyclic behavior are derived. In the quasi-static cyclic loading test results, five PBC specimens and one cast-in-place (CIP) bridge column are designed, based on the criteria that their lateral "yield" strengths are identical, i.e. the concept of equivalent lateral force design. The results show that the PBC specimens realized the targeted lateral strength and exhibited self-centering damping behavior. Compared with the test data, the errors of the "yield" and ultimate strengths predicted by the analytical equations were -9.3% and 8.0%, respectively. The PBC specimens remained nearly intact throughout the tests, although minor cracks were detected in the concrete. In contrast, spalling of concrete and buckling of rebars were observed in the CIP specimen. The comparisons between the PBC specimens indicated that the novel bridge column could maintain self-centering capability and achieve the largest damping capacity when the lateral force-resisting contribution ratio of energy-dissipating steel rebars is 35%, the PT tendons are prestressed to 35% of ultimate stress with a reinforcement ratio of 0.35%, and the embedded depth is 0.7 times the width of the column.
Keyword ：
socket connection socket connection Bridge column Bridge column self-centering self-centering rocking rocking experimental test experimental test
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| GB/T 7714 | Jia, Junfeng , Bian, Jiachen , Xu, Kun et al. Cyclic Loading Tests of Novel Precast Bridge Columns with Off-Site Post-Tensioned Tendons and On-Site Socket Connection [J]. | JOURNAL OF EARTHQUAKE ENGINEERING , 2024 , 29 (4) : 791-815 . |
| MLA | Jia, Junfeng et al. "Cyclic Loading Tests of Novel Precast Bridge Columns with Off-Site Post-Tensioned Tendons and On-Site Socket Connection" . | JOURNAL OF EARTHQUAKE ENGINEERING 29 . 4 (2024) : 791-815 . |
| APA | Jia, Junfeng , Bian, Jiachen , Xu, Kun , Qiu, Canxing , Du, Xiuli , Guo, He et al. Cyclic Loading Tests of Novel Precast Bridge Columns with Off-Site Post-Tensioned Tendons and On-Site Socket Connection . | JOURNAL OF EARTHQUAKE ENGINEERING , 2024 , 29 (4) , 791-815 . |
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Abstract ：
本实用新型公开了装配式金属弯曲屈服阻尼器，包括：X型钢板、钢垫块、连接螺母和连接螺杆四部分。钢垫块与X型钢板交替布置，二者通过预紧的螺杆装配成整体钢垫块开竖向螺栓孔，以便阻尼器与结构栓接。该阻尼器在水平向地震作用下，上下两端产生相对位移，X型钢板发生弯曲变形，为结构提供刚度和阻尼。与常见的金属弯曲阻尼器相比，本实用新型无需焊接工艺，避免了焊接过程产生的残余应力、工艺差异和焊接部位易发生断裂等不利因素，因而提高了阻尼器力学性能的稳定性；并且，若震后需更换X型钢板，本实用新型采用的装配式连接方式可有效地提高更换效率。
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| GB/T 7714 | 邱灿星 , 黄天艺 , 张爱芳 et al. 装配式金属弯曲屈服阻尼器 : CN202320093876.X[P]. | 2023-01-31 . |
| MLA | 邱灿星 et al. "装配式金属弯曲屈服阻尼器" : CN202320093876.X. | 2023-01-31 . |
| APA | 邱灿星 , 黄天艺 , 张爱芳 , 杜修力 . 装配式金属弯曲屈服阻尼器 : CN202320093876.X. | 2023-01-31 . |
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Abstract ：
本实用新型公开了双阶屈服金属弯曲阻尼器，包括上层钢板、下层钢板、带滑槽连接板、X型钢板、三角形钢板、滑动轴、连接螺钉、螺钉垫片。多块三角形钢板顶部置入上层钢板开槽当中，并与上层钢板焊接连接；三角形钢板下部预先开槽，并置入滑动轴，滑动轴两侧分别置入两块连接板中，两块连接板焊接在下层钢板上；在小震作用下阻尼器上下相对位移小，外侧两块X型钢板首先受弯进入屈服状态耗能，而中间三角形钢板在小震作用下处于弹性状态，未进入屈服阶段；在阻尼器受到大震作用时，上下两层钢板相对位移增大，三角形钢板也进入受弯屈服状态，两种钢板共同耗能。通过控制两种钢板的相关参数，本发明可起到在大震小震分别作用下分阶耗能的效果。
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| GB/T 7714 | 邱灿星 , 黄天艺 , 张爱芳 et al. 双阶屈服金属弯曲阻尼器 : CN202320093875.5[P]. | 2023-01-31 . |
| MLA | 邱灿星 et al. "双阶屈服金属弯曲阻尼器" : CN202320093875.5. | 2023-01-31 . |
| APA | 邱灿星 , 黄天艺 , 张爱芳 , 杜修力 . 双阶屈服金属弯曲阻尼器 : CN202320093875.5. | 2023-01-31 . |
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Abstract ：
本发明公开了一种双阶屈服金属弯曲阻尼器，包括上层钢板、下层钢板、带滑槽连接板、X型钢板、三角形钢板、滑动轴、连接螺钉、螺钉垫片。多块三角形钢板顶部置入上层钢板开槽当中，并与上层钢板焊接连接；三角形钢板下部预先开槽，并置入滑动轴，滑动轴两侧分别置入两块连接板中，两块连接板焊接在下层钢板上；在小震作用下阻尼器上下相对位移小，外侧两块X型钢板首先受弯进入屈服状态耗能，而中间三角形钢板在小震作用下处于弹性状态，未进入屈服阶段；在阻尼器受到大震作用时，上下两层钢板相对位移增大，三角形钢板也进入受弯屈服状态，两种钢板共同耗能。通过控制两种钢板的相关参数，本发明可起到在大震小震分别作用下分阶耗能的效果。
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| GB/T 7714 | 邱灿星 , 黄天艺 , 张爱芳 et al. 一种双阶屈服金属弯曲阻尼器 : CN202310048607.6[P]. | 2023-01-31 . |
| MLA | 邱灿星 et al. "一种双阶屈服金属弯曲阻尼器" : CN202310048607.6. | 2023-01-31 . |
| APA | 邱灿星 , 黄天艺 , 张爱芳 , 杜修力 . 一种双阶屈服金属弯曲阻尼器 : CN202310048607.6. | 2023-01-31 . |
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