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学者姓名：张建伟
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Abstract ：
This paper proposed a method to enhance the energy dissipation capacity of recycled aggregate concrete (RAC) shear walls reinforced with ultra-high strength bars (UHSB). The proposed method encases circular steel tubes within the boundary elements of walls. With the presence of steel tubes, steel fibers and axial load level as primary research variables, five RAC shear walls were fabricated and tested under reversed cyclic lateral force and constant axial compression to verify the effectiveness of the proposed method. The test results showed that the presence of steel tubes upgraded lateral resistance and enhanced energy dissipation capacity, while causing some subtle splitting cracks. Due to the yielding of the steel tubes, the encasement of the steel tube increased residual drift ratio at large drift, but the measured residual drift ratios of test walls still were kept less than 0.5 % until 2.5 % drift ratio. The addition of steel fibers delayed cracking, constrained the cover concrete and reduced damage to the specimens. Test results also indicated that increasing concrete strength and axial compression level could enhance the lateral resistance of the proposed wall. In addition, a numerical analytical method is presented to analyze the cyclic behavior of the proposed shear walls. Good agreement was observed between the measured and calculated hysteretic loops.
Keyword ：
Cyclic lateral force Cyclic lateral force Resilient shear walls Resilient shear walls Numerical simulation model Numerical simulation model Seismic behavior Seismic behavior Steel tube Steel tube
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| GB/T 7714 | Zhang, Jianwei , Zhang, Man , Liu, Xiao et al. Structural behavior of steel tube reinforced resilient RAC shear walls under static cyclic loading [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Zhang, Jianwei et al. "Structural behavior of steel tube reinforced resilient RAC shear walls under static cyclic loading" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Zhang, Jianwei , Zhang, Man , Liu, Xiao , Sun, Yuping . Structural behavior of steel tube reinforced resilient RAC shear walls under static cyclic loading . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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Abstract ：
There is a growing interest in recycled aggregate concrete (RAC) as a green material. This study investigated the stress-strain behavior of high-strength RAC through 36 uniaxial compression tests. The effects of recycled coarse aggregate (RCA) replacement ratio, concrete strength, steel fiber content and stirrup volume ratio on the failure mode and mechanical behaviors of the specimen were investigated. The failure mode and stress-strain curve of RAC specimens were similar to those of normal aggregate concrete (NAC) specimens. The failure process of the specimens was decelerated and the compression damage of concrete was reduced after incorporation of steel fibers. As the RCA replacement ratio increased, the elastic modulus and ultimate strain of specimens decreased, while the peak strain increased. Increasing the concrete strength could significantly improve the elastic modulus of the RAC, but would result in a decrease in the ultimate strain. The configuration of steel fibers, stirrups, or both could improve the peak strain and ultimate strain of RAC, making the compressive behavior of RAC similar to that of NAC. Based on the test results, the unified models applicable to predicting the stress-strain relationship of high-strength steel fiber RAC confined by stirrups were proposed. It is expected to provide theoretical basis and data support for numerical simulation analysis of RAC structures.
Keyword ：
High -strength recycled aggregate concrete High -strength recycled aggregate concrete Stress -strain behavior Stress -strain behavior Stress -strain model Stress -strain model Stirrup confinement Stirrup confinement Steel fibers Steel fibers
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| GB/T 7714 | Tao, Xinyi , Zhang, Jianwei , Zhang, Man et al. Uniaxial compression behavior of steel fiber reinforced recycled coarse aggregate concrete confined by stirrups [J]. | STRUCTURES , 2024 , 60 . |
| MLA | Tao, Xinyi et al. "Uniaxial compression behavior of steel fiber reinforced recycled coarse aggregate concrete confined by stirrups" . | STRUCTURES 60 (2024) . |
| APA | Tao, Xinyi , Zhang, Jianwei , Zhang, Man , Dong, Hongying . Uniaxial compression behavior of steel fiber reinforced recycled coarse aggregate concrete confined by stirrups . | STRUCTURES , 2024 , 60 . |
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Abstract ：
Although recycled aggregate concrete (RAC) has been used in structural engineering, the application of brickconcrete recycled aggregate concrete (BCRC) in structural engineering remains limited. Bond-slip behavior is critical for the co-work between concrete and reinforcement bars. This study investigated the bond-slip behavior between BCRC and reinforcement bars through 45 pull-out tests. The variables studied include concrete type (natural aggregate concrete (NAC) and BCRC), recycled brick aggregate (RBA) replacement ratio (0 %, 25 %, and 50 %), concrete cylinder compressive strength (30 MPa and 40 MPa), concrete cover thickness (30 mm, 50 mm, and 68 mm), reinforcement diameter (8 mm, 14 mm, and 20 mm), bond length (5 d, 10 d, 15 d, and 20 d), stirrup ratio (0.5 %, 0.7 %, and 1.0 %), and reinforcement shape (deformed and plain). The results show that compared with NAC, the normalized ultimate bond strength of BCRC with RBA replacement ratios of 0 %, 25 %, and 50 % increased by 7.5 %, 3.6 %, and 19.2 %, respectively. As the cylinder compressive strength of BCRC increased from 30 MPa to 40 MPa, the ultimate bond strength increased by 24.5 %, and the ultimate slip decreased by 20.0 %. Based on the test data, a bond stress-slip model for BCRC was proposed, demonstrating high accuracy. The models proposed in this paper can provide a reference for the engineering structural design of BCRC.
Keyword ：
Pull-out test Pull-out test Brick-concrete recycled aggregate Brick-concrete recycled aggregate Reinforced concrete Reinforced concrete Bond stress -slip model Bond stress -slip model Hot-rolled ribbed bar Hot-rolled ribbed bar
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| GB/T 7714 | Zhang, Jianwei , Zhong, Bowen , Zhao, Di et al. Bond-slip behavior between confined brick-concrete recycled aggregate concrete and reinforcement bars [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 436 . |
| MLA | Zhang, Jianwei et al. "Bond-slip behavior between confined brick-concrete recycled aggregate concrete and reinforcement bars" . | CONSTRUCTION AND BUILDING MATERIALS 436 (2024) . |
| APA | Zhang, Jianwei , Zhong, Bowen , Zhao, Di , Dong, Hongying . Bond-slip behavior between confined brick-concrete recycled aggregate concrete and reinforcement bars . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 436 . |
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Abstract ：
To investigate the post -earthquake repairability of the resilient structure utilizing ultra -high strength bar, an earthquake -damaged piloti-type masonry structure specimen reinforced with ultra -high strength bar was rehabilitated through a composite rehabilitation strategy. The rehabilitation approach incorporated a prefabricated steel sleeve and carbon fiber reinforced polymer was adopted for the frame -shear wall structure at the piloti-storey, along with a combination of steel plate application and steel mesh mortar for repairing the masonry wall. The seismic behavior of the rehabilitated structure was investigated through quasi -static test and OpenSees numerical simulation platform. The results showed that: The piloti-type masonry structure with ultra -high strength rebar showed excellent repairability. The rehabilitation strategy in this study significantly enhanced the stiffness of the damaged recycled aggregate masonry wall, improved the shear resistance of the shear wall, and enhanced the deformation performance of the rehabilitated piloti-type structure. In comparison with the control specimen, the stiffness degradation rate of the rehabilitated specimen decreased obviously, the peak carrying capacity and ultimate drift increased by 21.6 % and 35.4 %, respectively. Moreover, the piloti-storey drift of the rehabilitated specimen can reach 2 %. These research findings serve as a solid foundation for further exploration of post -earthquake repairability in resilient structures and the seismic performance of rehabilitated structures.
Keyword ：
Resilience Resilience Seismic behavior Seismic behavior Ultra -high strength bar Ultra -high strength bar Recycled aggregate piloti-type structure Recycled aggregate piloti-type structure Rehabilitation Rehabilitation
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| GB/T 7714 | Wang, Fei , Zhang, Jianwei , Liu, Weiheng et al. Seismic behavior of rehabilitated recycled aggregate piloti-type structure reinforced with ultra-high strength bars [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 84 . |
| MLA | Wang, Fei et al. "Seismic behavior of rehabilitated recycled aggregate piloti-type structure reinforced with ultra-high strength bars" . | JOURNAL OF BUILDING ENGINEERING 84 (2024) . |
| APA | Wang, Fei , Zhang, Jianwei , Liu, Weiheng , Zhao, Di , Cao, Wanlin . Seismic behavior of rehabilitated recycled aggregate piloti-type structure reinforced with ultra-high strength bars . | JOURNAL OF BUILDING ENGINEERING , 2024 , 84 . |
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Abstract ：
To investigate the influence of using high-strength steel bars in columns on the seismic resistance capacity and seismic resilience of frame structures, seismic fragility evaluation of three 8-story reinforced concrete (RC) frame structures was conducted based on the incremental dynamic analysis (IDA) using 11 ground motion records. The main parameter is the longitudinal reinforcement configuration in the frame columns, where the first structure is reinforced with HRB 600 grade steel bars in the columns, the second structure is replaced with equal area ultra-high-strength (UHS) steel bars (i.e., with a yield strength of approximately 1425 MPa), and the third structure is replaced with equal strength UHS steel bars. A numerical model of the RC frame structure was developed and then validated using previous experimental results. The exceeding probabilities at various performance limit states were calculated based on two typical engineering demand parameters (EDPs) of maximum interstory drift and residual interstory drift. The results showed that using UHS longitudinal steel bars instead of HRB 600 grade steel bars in frame columns could reduce the energy dissipation capacity of the structure, inevitably leading to an increase in the maximum interstory response of the frame. However, much lower exceedance probability was observed in the UHS-enhanced frame under the repair available limit state based on the residual interstory drift, indicating that the UHS-enhanced RC frame had higher seismic resilience. In addition, compared to equal area substitution, equal strength substitution is a more ideal design method that can use fewer UHS steel bars to achieve comparable reparability and a smaller increase in maximum interstory drift.
Keyword ：
seismic resilience seismic resilience frame structure frame structure finite element model finite element model high-strength steel bars high-strength steel bars seismic fragility evaluation seismic fragility evaluation high-strength concrete high-strength concrete
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| GB/T 7714 | Liu, Juan , Zhang, Jianwei , Zhao, Zuozhou . Seismic fragility analysis of high-strength concrete frame structures reinforced with high-strength steel bars [J]. | STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS , 2024 , 33 (10) . |
| MLA | Liu, Juan et al. "Seismic fragility analysis of high-strength concrete frame structures reinforced with high-strength steel bars" . | STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS 33 . 10 (2024) . |
| APA | Liu, Juan , Zhang, Jianwei , Zhao, Zuozhou . Seismic fragility analysis of high-strength concrete frame structures reinforced with high-strength steel bars . | STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS , 2024 , 33 (10) . |
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Abstract ：
This paper proposed a new type of resilient concrete wall consisting of steel fiber reinforced recycled aggregate concrete (SRAC) and weakly bonded ultra-high strength bars (UHSBs). Five specimens were fabricated and tested under reversed cyclic lateral force and constant axial load to investigate the seismic performance of the proposed resilient SRAC walls. Experimental parameters included the presence of steel fibers, the concrete strength, the volumetric ratio of the stirrup used in the boundary elements, and the axial load ratio. All test walls exhibited a stable increase of lateral resistance up to 2% drift ratio, while residual drift ratios were only about one-tenth of the transient drift ratios. Test results also indicated that adding steel fibers and increasing concrete strength could mitigate the development of cracks while increasing axial load could delay the development of UHSBs tensile strain and cracks. In addition, the residual drift ratios and corresponding design objectives, as recommended in FEMA 356 and previous studies, were introduced to evaluate the resilience of the proposed SRAC walls. All test specimens could meet the optimal performance design objective. Parallel to the experimental work, a method for simply calculating the skeleton curve and a model to evaluate the hysteretic loops of the proposed walls are presented. The calculated skeleton curves and hysteretic circles agreed well with the test results.
Keyword ：
Recycled aggregate concrete Recycled aggregate concrete Residual drift Residual drift Resilient walls Resilient walls Steel fibers Steel fibers Ultra-high strength bars Ultra-high strength bars
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| GB/T 7714 | Zhang, Man , Zhang, Jianwei , Sun, Yuping et al. Seismic performance and analysis of resilient high-strength SRAC walls [J]. | ENGINEERING STRUCTURES , 2023 , 296 . |
| MLA | Zhang, Man et al. "Seismic performance and analysis of resilient high-strength SRAC walls" . | ENGINEERING STRUCTURES 296 (2023) . |
| APA | Zhang, Man , Zhang, Jianwei , Sun, Yuping , Tao, Xinyi . Seismic performance and analysis of resilient high-strength SRAC walls . | ENGINEERING STRUCTURES , 2023 , 296 . |
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Abstract ：
Six shear walls using high-strength concrete and high-strength steels were studied by conducting cyclic load tests, including two reinforced concrete shear walls, and four composite walls reinforced by concrete-filled steel tubes (CFSTs). The effects of steel fibers and boundary element forms on the cyclic behavior of the walls were investigated. Research founds that the steel fiber reinforced specimens showed lighter damage degree, lower deformation capacity, and lower proportion of shear deformation than the non-fiber reinforced specimens. Among the three types of specimens with different boundary elements, steel fibers had the greatest influence on the composite walls with concrete-encased CFST columns in boundary zone. Compared the two types of composite walls reinforced by CFSTs which were designed by the principle of "equal vertical bearing capacity of the boundary elements", the walls with outer CFST columns showed better energy dissipation capacity than the walls with concrete-encased CFST columns. Finally, considering the stress characteristics and the constraint effect of boundary elements of different kinds of shear walls, the simplified calculation model of load-carrying capacity and the finite element analysis model were established and verified.
Keyword ：
CFST columns CFST columns Finite element modelling Finite element modelling Steel fiber reinforced high strength concrete Steel fiber reinforced high strength concrete Shear walls Shear walls Seismic behavior Seismic behavior
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| GB/T 7714 | Li, Xiangyu , Zhang, Jianwei , Cao, Wanlin et al. The effects of steel fibers and boundary elements on the seismic behavior of high-strength concrete shear walls [J]. | JOURNAL OF BUILDING ENGINEERING , 2023 , 70 . |
| MLA | Li, Xiangyu et al. "The effects of steel fibers and boundary elements on the seismic behavior of high-strength concrete shear walls" . | JOURNAL OF BUILDING ENGINEERING 70 (2023) . |
| APA | Li, Xiangyu , Zhang, Jianwei , Cao, Wanlin , Li, Yaqiang . The effects of steel fibers and boundary elements on the seismic behavior of high-strength concrete shear walls . | JOURNAL OF BUILDING ENGINEERING , 2023 , 70 . |
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Abstract ：
This study investigated the bond behavior of ultrahigh-strength steel bars with spiral grooves (UHSSBs) embedded in high-strength recycled aggregate concrete (RAC). Forty-five pullout specimens under monotonic loadings were designed to evaluate the effect of several parameters on the bond strength. The variables included concrete strength (50 MPa-60 MPa); recycled concrete aggregate (RCA) replacement ratio (0 %, 50 %, and 100 %); embedment length (5db, 10db, and 20db); concrete cover (25 mm, 45 mm, and 68.7 mm); surface treatment; volume fraction of steel fibers in RAC and stirrup ratio. The failure modes of these tests mainly concentrated on two types, pullout-type bond failure and splitting-type bond failure. According to the typical bond stress-slip curves and trendlines of plotted values, the bond strength increased with increasing of concrete compressive strength. For specimens with splitting-type bond failure, the higher normalized bond strength was observed in higher RCA replacement ratio and concrete cover thickness. The factors of embedment length and surface treatment were also proven to be effective for bond strength. For specimens with pullout-type bond failure, the presence of steel fibers and stirrups substantially restricted the splitting crack growth and improved the bond failure modes. Combined with previous experimental results, simple empirical equations for the average bond strength and bond stress-slip relationship between UHSSBs and RAC under different types of bond failure were developed by regression analysis, which can capture the experimental data with high accuracy.
Keyword ：
High-strength recycled aggregate concrete High-strength recycled aggregate concrete Bond stress-slip curve Bond stress-slip curve Pullout tests Pullout tests Ultrahigh-strength steel bars Ultrahigh-strength steel bars
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| GB/T 7714 | Zhang, Jianwei , Liu, Yujun , Zhao, Di et al. Bond stress-slip behavior of ultrahigh-strength steel bars with spiral grooves embedded in plain and steel fiber high-strength recycled aggregate concrete [J]. | JOURNAL OF BUILDING ENGINEERING , 2023 , 80 . |
| MLA | Zhang, Jianwei et al. "Bond stress-slip behavior of ultrahigh-strength steel bars with spiral grooves embedded in plain and steel fiber high-strength recycled aggregate concrete" . | JOURNAL OF BUILDING ENGINEERING 80 (2023) . |
| APA | Zhang, Jianwei , Liu, Yujun , Zhao, Di , Tao, Xinyi , Zhang, Man . Bond stress-slip behavior of ultrahigh-strength steel bars with spiral grooves embedded in plain and steel fiber high-strength recycled aggregate concrete . | JOURNAL OF BUILDING ENGINEERING , 2023 , 80 . |
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Abstract ：
To promote the green development of resilient cities and achieve resilient buildings constructed with recycled materials, it is necessary to further extend the engineering application technology of high-strength recycled aggregate concrete (HSRAC) in resilient structures. In this paper, pseudostatic tests were carried out on six HSRAC columns with ultra-high-strength steel bars (UHSS). The test variables include the UHSS percentage, stirrup ratio, axial compression ratio and UHSS bond strength. In addition, finite element models were developed to conduct the parametric analysis and optimization assessment. Based on the experimental research and finite element analysis, the seismic performance and repairability of HSRAC columns were discussed. The results revealed that HSRAC columns employing the UHSS possessed excellent self-centering capability and remarkable drift-hardening property. Well-designed HSRAC resilient columns can be repaired within 4.0% drift. In addition, the engineering design references were recommended based on reliable simulation results.
Keyword ：
Pseudostatic tests Pseudostatic tests Finite element analysis Finite element analysis Resilient columns Resilient columns Seismic performance Seismic performance Ultra -high -strength steel bars Ultra -high -strength steel bars High -strength recycled aggregate concrete High -strength recycled aggregate concrete
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| GB/T 7714 | Liu, Xiao , Zhang, Jianwei , Zhang, Man et al. Experimental research and finite element analysis on seismic performance of resilient columns applying high-strength recycled aggregate concrete [J]. | STRUCTURES , 2023 , 52 : 1130-1145 . |
| MLA | Liu, Xiao et al. "Experimental research and finite element analysis on seismic performance of resilient columns applying high-strength recycled aggregate concrete" . | STRUCTURES 52 (2023) : 1130-1145 . |
| APA | Liu, Xiao , Zhang, Jianwei , Zhang, Man , Cao, Wanlin . Experimental research and finite element analysis on seismic performance of resilient columns applying high-strength recycled aggregate concrete . | STRUCTURES , 2023 , 52 , 1130-1145 . |
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Abstract ：
There is a growing interest in the development of precast structures. In this paper, a semi-precast high-strength recycled aggregate concrete (RAC) column with high-strength reinforcement was studied, which was consisted of cast-in-situ core concrete surrounded by a precast external shell. Six full-scale columns were fabricated and tested under cyclic lateral load, of which two were cast-in-situ columns and four were semi-precast columns. The penetration of shear reinforcement between precast external shell and cast-in-situ core column, core column diameter and axial load were the major design parameters. The test results showed that all specimens exhibited a good deformation capacity with an ultimate drift ratio greater than 3%. The semi-precast columns had comparable seismic performance with the cast-in-situ columns, indicating that the penetrating shear reinforcement and the core column diameter had little effect on the seismic performance. The core column diameter could be selected according to the practical engineering requirements. Increasing the axial load can significantly improve the lateral load-carrying capacity of the specimens, but would result in larger residual drift ratio, which was adverse to the repairability of the specimens. The flexural deformation and the deformation resulting from slippage of longitudinal reinforcement in the concrete foundation accounted for 50%-80% and 10%-20% of the lateral displacement, respectively, which should not be ignored in the deformation calculation; however, the shear deformation can be ignored. The optimized models applicable to calculate the F-Delta curves of semi-precast high-strength RAC columns with high-strength reinforcement were proposed. Parametric analysis based on the optimized models was carried out to develop N-M curves for various precast external shell or core column concrete strength, and core column diameters.
Keyword ：
Fiber-based method model Fiber-based method model High-strength recycled aggregate concrete High-strength recycled aggregate concrete High-strength reinforcement High-strength reinforcement Seismic behavior Seismic behavior Semi-precast column Semi-precast column
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| GB/T 7714 | Zhang, Jianwei , Tao, Xinyi , Liu, Juan et al. Seismic performance of semi-precast high-strength recycled aggregate concrete columns with high-strength reinforcement [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
| MLA | Zhang, Jianwei et al. "Seismic performance of semi-precast high-strength recycled aggregate concrete columns with high-strength reinforcement" . | JOURNAL OF BUILDING ENGINEERING 45 (2022) . |
| APA | Zhang, Jianwei , Tao, Xinyi , Liu, Juan , Dong, Hongying , Cao, Wanlin . Seismic performance of semi-precast high-strength recycled aggregate concrete columns with high-strength reinforcement . | JOURNAL OF BUILDING ENGINEERING , 2022 , 45 . |
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