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学者姓名：薛俊青
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Abstract ：
In jointless bridges, a grade flat approach slab (GFAS) with the same elevation as the pavement can transfer the girder's longitudinal deformation to the backfill. However, any cracks and settlement of the pavement usually occur at the end of the GFAS. To address this shortcoming, the buried flat approach slab (BFAS) horizontally embedded at a depth in the backfill was proposed. The complicated flat approach slab-soil interaction (FASSI) of the BFAS has not been systemically investigated. To address this gap, the influence of the FASSI on the mechanical performance of the approach slab and the backfill deformation was investigated in this research to understand the mechanism of the FASSI in absorbing one part of the girder's longitudinal deformation and transferring the rest to the soil. Experimental tests on the FASSI with different embedded depths under longitudinal displacements were conducted. Numerical parametric analyses were carried out by considering the embedded depths and slab lengths as the parameters based on a finite element model verified using the test results. The results show that load-displacement curves of the FASSI comprise three stages: the elastic stage (approach slab's displacement was absorbed by sand), the elastoplastic stage (sand deformation was observed), and the failure stage (overall shear failure of the sand was found). The longitudinal displacement transfer mode and vertical deformation distribution mode of the sand were affected by the embedded depth and slab length. With an increase in the embedded depth or a decrease in the slab length, the sand deformation decreases, which is beneficial for avoiding pavement crack risks and improving the pavement evenness. Finally, a simplified calculation formula that can be used to predict the load-displacement curves of the FASSI was proposed. This research provides the theoretical basis for the design and construction of the flat approach slab in jointless bridges.
Keyword ：
approach slab-soil interaction approach slab-soil interaction flat approach slab flat approach slab jointless bridges jointless bridges load-displacement curve load-displacement curve sand deformation sand deformation simplified calculation formula simplified calculation formula
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| GB/T 7714 | Tang, Yufeng , Briseghella, Bruno , Xue, Junqing et al. Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
| MLA | Tang, Yufeng et al. "Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge" . | APPLIED SCIENCES-BASEL 14 . 24 (2024) . |
| APA | Tang, Yufeng , Briseghella, Bruno , Xue, Junqing , Nuti, Camillo , Huang, Fuyun . Experimental and Numerical Investigations of Flat Approach Slab-Soil Interaction in Jointless Bridge . | APPLIED SCIENCES-BASEL , 2024 , 14 (24) . |
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This paper investigates the mechanical performance of ultra-high-performance concrete (UHPC) beam-to-beam joints in steel–concrete composite bridges, proposing an alternative to conventional reinforced concrete (RC) joints in continuous beams. The authors employed UHPC with steel end-plates and studs to connect the UHPC crossbeam with the steel beams and RC slab. These connections provides advantages like eliminating the need for on-site welding, simplifying construction, and handling potential tolerance issues. The research includes full-scale experimental tests, a benchmark test on an RC joint, validation of finite element models, parametric analyses, and the development of analytical models to predict the joint's moment–rotation curve, initial stiffness, and ultimate bending capacity. Full-scale experiments revealed that the maximum longitudinal concrete stress in UHPC continuity joints occurs at the interface between the composite steel–concrete beam and the UHPC cross-beams, resulting in crack widths substantially below code limits. The parametric analyses identified critical factors affecting UHPC joint performance, such as concrete strength, steel yield strength, and horizontal stud dimensions. Additionally, the study validated existing formulations for predicting the capacity and stiffness of the joints against the results from the finite element (FE) parametric analyses. © 2024 The Author(s)
Keyword ：
Benchmarking Benchmarking Bending tests Bending tests Composite beams and girders Composite beams and girders Composite bridges Composite bridges Concrete beams and girders Concrete beams and girders Concrete testing Concrete testing Finite element method Finite element method High performance concrete High performance concrete Reinforced concrete Reinforced concrete Stiffness Stiffness Studs (fasteners) Studs (fasteners) Studs (structural members) Studs (structural members)
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| GB/T 7714 | Contento, Alessandro , Aloisio, Angelo , Xue, Junqing et al. Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design [J]. | Engineering Structures , 2024 , 316 . |
| MLA | Contento, Alessandro et al. "Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design" . | Engineering Structures 316 (2024) . |
| APA | Contento, Alessandro , Aloisio, Angelo , Xue, Junqing , He, Junping , Briseghella, Bruno . Ultra-high performance concrete beam-to-beam connections in continuous bridges: Experimental full-scale tests, FE analyses and design . | Engineering Structures , 2024 , 316 . |
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Integral abutment bridges (IABs) have been widely applied in bridge engineering because of their excellent seismic performance, long service life, and low maintenance cost. The superstructure and substructure of an IAB are integrally connected to reduce the possibility of collapse or girders falling during an earthquake. The soil behind the abutment can provide a damping effect to reduce the deformation of the structure under a seismic load. Girders have not been considered in some of the existing published experimental tests on integral abutment-reinforced-concrete (RC) pile (IAP)-soil systems, which may not accurately represent real conditions. A pseudo-static low-cycle test on a girder-integral abutment-RC pile (GIAP)-soil system was conducted for an IAB in China. The experiment's results for the GIAP specimen were compared with those of the IAP specimen, including the failure mode, hysteretic curve, energy dissipation capacity, skeleton curve, stiffness degradation, and displacement ductility. The test results indicate that the failure modes of both specimens were different. For the IAP specimen, the pile cracked at a displacement of +2 mm, while the abutment did not crack during the test. For the GIAP specimen, the pile cracked at a displacement of -8 mm, and the abutment cracked at a displacement of 50 mm. The failure mode of the specimen changed from severe damage to the pile top under a small displacement to damage to both the abutment and pile top under a large displacement. Compared with the IAP specimen, the initial stiffness under positive horizontal displacement (39.2%), residual force accumulation (22.6%), residual deformation (12.6%), range of the elastoplastic stage in the skeleton curve, and stiffness degradation of the GIAP specimen were smaller; however, the initial stiffness under negative horizontal displacement (112.6%), displacement ductility coefficient (67.2%), average equivalent viscous damping ratio (30.8%), yield load (20.4%), ultimate load (7.8%), and range of the elastic stage in the skeleton curve of the GIAP specimen were larger. In summary, the seismic performance of the GIAP-soil system was better than that of the IAP-soil system. Therefore, to accurately reflect the seismic performance of GIAP-soil systems in IABs, it is suggested to consider the influence of the girder.
Keyword ：
bridge engineering bridge engineering displacement ductility displacement ductility equivalent viscous damping ratio equivalent viscous damping ratio integral abutment bridge integral abutment bridge pseudo-static test pseudo-static test seismic performance seismic performance
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| GB/T 7714 | Guo, Weiqiang , Briseghella, Bruno , Xue, Junqing et al. Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (22) . |
| MLA | Guo, Weiqiang et al. "Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems" . | APPLIED SCIENCES-BASEL 14 . 22 (2024) . |
| APA | Guo, Weiqiang , Briseghella, Bruno , Xue, Junqing , Nuti, Camillo , Huang, Fuyun . Experimental Investigations of Seismic Performance of Girder-Integral Abutment-Reinforced-Concrete Pile-Soil Systems . | APPLIED SCIENCES-BASEL , 2024 , 14 (22) . |
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This paper studied the axial compression behavior of the steel tube reinforced concrete (STRC) column, which consisted of inner CFST and outer RC components. Ten specimens, including seven STRC columns, two RC columns, and one CFST column were tested. The test parameters included the CFST area ratio (inner CFST to the whole section), longitudinal rebar ratio and stirrup space. The test results showed that the compressive behavior of STRC column with a CFST area ratio of 0.04 was close to that of the RC column, and the compressive behavior of the STRC column with a CFST area ratio of 0.13 was between that of the RC column and CFST column. The finite element (FE) models were developed and verified by test results to investigate the effects of longitudinal rebar ratio and stirrup space on the axial compression behavior of STRC column with various CFST area ratios. The load distribution between inner CFST and outer RC components was analyzed. The FE results showed that the effects of the longitudinal rebar ratio on the ultimate load of STRC column were related to the CFST area ratio. The accuracy and applicability of the five methods suggested by codes for predicting the ultimate load of STRC column were discussed based on the test and FE results.
Keyword ：
Axial compression Axial compression CFST area ratio CFST area ratio Finite element Finite element Longitudinal rebar ratio Longitudinal rebar ratio Steel tube reinforced concrete Steel tube reinforced concrete Ultimate load Ultimate load
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| GB/T 7714 | He, Fuyun , Li, Cong , Chen, Baochun et al. Axial compression behavior of steel tube reinforced concrete column [J]. | ENGINEERING STRUCTURES , 2024 , 303 . |
| MLA | He, Fuyun et al. "Axial compression behavior of steel tube reinforced concrete column" . | ENGINEERING STRUCTURES 303 (2024) . |
| APA | He, Fuyun , Li, Cong , Chen, Baochun , Briseghella, Bruno , Xue, Junqing . Axial compression behavior of steel tube reinforced concrete column . | ENGINEERING STRUCTURES , 2024 , 303 . |
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Concrete-filled steel tubular (CFST) columns are increasingly used around the world due to their significant structural and economic advantages. Although considerable research and several experimental tests have been carried out on CFST col-umns, there are no mechanics-based probabilistic models of their axial capacity. The present paper proposes a mechanics-based probabilistic capacity model for the assessment of the ultimate axial capacity of CFST columns. The accuracy of the numerical predictions obtained with the proposed formulation is compared with that of existing capacity equations already in use within technical standards and available in the literature. © 2024 The Editor(s).
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| GB/T 7714 | Aloisio, A. , Contento, A. , Xue, J. et al. Probabilistic capacity model for concrete-filled steel tubes [未知]. |
| MLA | Aloisio, A. et al. "Probabilistic capacity model for concrete-filled steel tubes" [未知]. |
| APA | Aloisio, A. , Contento, A. , Xue, J. , Quaranta, G. , Gardoni, P. , Briseghella, B. . Probabilistic capacity model for concrete-filled steel tubes [未知]. |
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The effectiveness of the use of fibers in Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) can be limited by their random orientation in the cementitious matrix. Oriented steel fibers, on the other hand, show significant promise in enhancing the tensile and flexural properties of UHPFRC specimens when the principal tensile stresses predominantly align in a single direction. Despite various proposed methods for orienting steel fibers in UHPFRC, their comparative impact on mechanical properties remained unclear. To bridge this gap, three different strategies were examined in this study, namely: i) chute with vibration table, ii) L-shaped device, and iii) electromagnetic field with vibration table, aiming at controlling the steel fibers orientation in UHPFRC specimens. Uniaxial tensile, four-point flexural, and compressive tests were conducted to examine the influence of different orientation methods on mechanical properties. The experimental findings revealed that compared to randomly oriented fibers, oriented steel fiber UHPFRC had superior tensile, flexural, and compressive strength. Additionally, fiber orientation led to improved consistency of the UHPFRC properties as well as thinner, more densely distributed cracks, regular fracture surfaces, and lower elastic modulus and Poisson's ratio. Electromagnetic field orientation proved to be the most effective orientation method, L-shaped device method the least effective due to heightened fluidity demands in the mixture, and the chute with vibration method ranked in between. This research represents a thorough investigation into the comparative efficacy of different methods for orienting steel fibers in UHPFRC, shedding new light on the optimal approach to enhance mechanical properties. © 2024 Elsevier Ltd
Keyword ：
Four-point flexural test Four-point flexural test Mechanical property Mechanical property Orientation Orientation Steel fiber Steel fiber Ultra-high performance fiber reinforced concrete Ultra-high performance fiber reinforced concrete Uniaxial tensile test Uniaxial tensile test
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| GB/T 7714 | Xue, J. , Mao, S. , Cacciola, P. et al. Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC [J]. | Construction and Building Materials , 2024 , 448 . |
| MLA | Xue, J. et al. "Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC" . | Construction and Building Materials 448 (2024) . |
| APA | Xue, J. , Mao, S. , Cacciola, P. , Contento, A. , Lampropoulos, A. , Nicolaides, D. et al. Experimental evaluation of the effectiveness of fiber orientation methods on the mechanical performance of UHPFRC . | Construction and Building Materials , 2024 , 448 . |
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This study examines the tensile behaviour of Ultra-High Performance Concrete (UHPC) specimens reinforced with varying steel fibre content and rebar diameters. An experimental campaign involving 18 reinforced UHPC specimens was conducted, following individual tensile response characterizations of UHPC and reinforcing steel. These specimens were designed and fabricated with threaded welded steel cages to transfer loads to the central measurement area. Force-displacement curves were measured to derive stress-strain curves for the UHPC component, evaluating the impact of reinforcement rebar and steel fibre content on UHPC's mechanical response. The analysis revealed that steel fibre volume content significantly influences the tensile response of UHPC reinforcement more than the steel bar diameter and yield strength. Comparing the strain in steel bars to the average strain in reinforced UHPC specimens indicated that post-cracking deformation concentrates at the crack. At the same time, the bond between reinforcement and UHPC remains intact in uncracked sections, allowing effective load transfer. UHPC specimens reinforced with 14 mm diameter steel bars displayed a significant horizontal segment in the descending phase of the stress-strain curve. In contrast, specimens with 18 mm or 22 mm diameter bars exhibit a progressive stress reduction at a nearly constant rate. Stress-strain curves of UHPC were fitted with a five-fold piecewise empirical model applicable to UHPC with a reinforcement ratio higher than 0.09%. The resulting model can be used to model the axial behaviour in UHPC, considering the effects of steel reinforcement.
Keyword ：
Rebar diameter Rebar diameter Steel fibre reinforcement Steel fibre reinforcement Stress-strain relationship Stress-strain relationship Tensile behaviour Tensile behaviour Ultra-High Performance Concrete (UHPC) Ultra-High Performance Concrete (UHPC)
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| GB/T 7714 | Xue, Junqing , Aloisio, Angelo , Contento, Alessandro et al. A piece-wise linear model for modelling the tension-stiffening effect in steel-reinforced UHPC composites [J]. | COMPOSITE STRUCTURES , 2024 , 345 . |
| MLA | Xue, Junqing et al. "A piece-wise linear model for modelling the tension-stiffening effect in steel-reinforced UHPC composites" . | COMPOSITE STRUCTURES 345 (2024) . |
| APA | Xue, Junqing , Aloisio, Angelo , Contento, Alessandro , Yang, Zhengxian , Hu, Ni , Briseghella, Bruno . A piece-wise linear model for modelling the tension-stiffening effect in steel-reinforced UHPC composites . | COMPOSITE STRUCTURES , 2024 , 345 . |
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This paper presents a procedure for rehabilitating plastic hinges with damaged/fractured weldable longitudinal rebars in severely damaged reinforced concrete (RC) bridge columns and possible improvements regarding connection protection and plastic hinge development. Damaged/fractured longitudinal rebars are replaced with new rebar segments, and the basis of this approach involves connecting intermediate machined parts to the original longitudinal rebars by welding with an off-the-shelf steel equal angle. The proposed rehabilitation design procedure is based on capacity design principles, with equations that define the new geometries and required ductility, and it is validated experimentally on three 1:6-scale RC circular column specimens. Compared with the original columns, the ductility capacity of the rehabilitated columns increased from 39% to 58%, and the energy dissipation (equivalent viscous damping ratio) increased from approximately 50% to 250%. The base shears of the rehabilitated columns were smaller than those of the original columns owing to the reduction in the rebar area; thus, shear failure was avoided, and the demand on the foundation was reduced. The rehabilitation procedure, by adopting a welding connection that is easily performed on site and concentrates the damage in the new rebar segments, promises to be a quick, simple, reliable, and effective means to improve the ductility and shear capacity of RC bridge columns without using mechanical couplers or changing the column dimensions.
Keyword ：
Carbon fiber reinforced polymer (CFRP) Carbon fiber reinforced polymer (CFRP) Design procedure Design procedure Experimental seismic behavior Experimental seismic behavior Plastic hinge Plastic hinge Rebar replacement Rebar replacement Rehabilitation Rehabilitation Reinforced concrete (RC) bridge column Reinforced concrete (RC) bridge column
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| GB/T 7714 | Xue, Junqing , Lavorato, Davide , Tarantino, Angelo M. et al. Rebar Replacement in Severely Damaged RC Bridge Column Plastic Hinges: Design Criteria and Experimental Investigation [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2023 , 149 (3) . |
| MLA | Xue, Junqing et al. "Rebar Replacement in Severely Damaged RC Bridge Column Plastic Hinges: Design Criteria and Experimental Investigation" . | JOURNAL OF STRUCTURAL ENGINEERING 149 . 3 (2023) . |
| APA | Xue, Junqing , Lavorato, Davide , Tarantino, Angelo M. , Briseghella, Bruno , Nuti, Camillo . Rebar Replacement in Severely Damaged RC Bridge Column Plastic Hinges: Design Criteria and Experimental Investigation . | JOURNAL OF STRUCTURAL ENGINEERING , 2023 , 149 (3) . |
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Concrete-filled steel tubular (CFST) structures have been widely used in high-rise buildings and long-span bridges for the high strength and ductility due to the confinement effect of the concrete core provided by the steel tube. This beneficial composite action could be damaged by circumferential debonding gap (CDG), which is nearly unavoidable in real CFST structures. Reliable formulations to predict the influence of CDG on the mechanical performance of compressed circular CFST columns are needed. In this paper, the experimental parameters and results of compressed circular CFST columns with CDG are summarized to discuss the deficiencies of the parameters chosen in the tests. Detailed finite element simulation procedures for compressed circular CFST columns with CDG, based on ABAQUS, are then introduced, verifying their accuracy by test results. Based on the validated finite element models, a database of compressed circular CFST columns with and without CDG, including strength, ductility and stiffness of specimens is established; it is obtained by covering suitable parameter ranges for CDG and CFST structures, in accordance with real applications. Successively, new formulations able to predict the ultimate load capacity, the reduction factor, the ductility and the stiffness of specimens are derived by the Evolutionary Polynomial Regression (EPR) methodology, demonstrating good accuracy and low complexity.
Keyword ：
Accuracy analysis Accuracy analysis Circumferential debonding gap Circumferential debonding gap Concrete filled steel tube Concrete filled steel tube Ductility Ductility Evolutionary polynomial regression Evolutionary polynomial regression Reduction coefficient Reduction coefficient Stiffness Stiffness Ultimate load capacity Ultimate load capacity
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| GB/T 7714 | Xue, Jun-Qing , Huang, Jian-Ping , Fiore, Alessandra et al. Prediction of the mechanical performance of compressed circular CFST columns with circumferential debonding gap [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2023 , 208 . |
| MLA | Xue, Jun-Qing et al. "Prediction of the mechanical performance of compressed circular CFST columns with circumferential debonding gap" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 208 (2023) . |
| APA | Xue, Jun-Qing , Huang, Jian-Ping , Fiore, Alessandra , Briseghella, Bruno , Marano, Giuseppe C. . Prediction of the mechanical performance of compressed circular CFST columns with circumferential debonding gap . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2023 , 208 . |
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Rehabilitating corroded or seismically damaged reinforced concrete (RC) bridge columns often involves replacing the longitudinal steel rebar. Welded joints offer a practical and efficient in-situ solution for connecting new rebar segments to existing undamaged rebar, even with irregularities in the steel reinforcement. However, traditional approaches to rebar joint welding have paid little attention to the overstrength of the welding seam, which can result in a brittle response. Properly designing such joints should aim for a ductile rebar failure. However, in-situ rehabilitation solutions often require reducing the seam length to save time and material costs and, not secondarily, avoiding the plastic hinge formation in the rehabilitated column. Therefore, providing the seam with adequate overstrength is crucial to achieving a ductile failure of the welded joint. This study presents an experimental investigation into the most effective methods for connecting existing and new rebar segments through welding, addressing on-site welding challenges such as limited operational space and weld orientation. Over 100 tensile tests have been conducted at Fuzhou University's laboratory in China to understand the response of nine welded joints. Among indirect butt joints, the study identifies two performance groups based on the ductile failure rate as the welding seams reduce. The symmetry of the joint and the presence of additional direct butt welding also in asymmetric joints can significantly improve the joint performance, determining a ductile failure with minimal welding lengths. In a second step, following a probabilistic approach, the study assesses the overstrength of indirect butt joints as a function of seam length for the two identified performance groups. Empirical failure probabilities of the rebar and the seam are estimated to fit probability density functions representative of the tensile strength of the rebar and the seam. Based on a target reliability class, the overstrength factors are estimated.
Keyword ：
Experimental testing Experimental testing Overstrength Overstrength RC column rehabilitation RC column rehabilitation Rebars welded joints Rebars welded joints Reinforced concrete bridge columns Reinforced concrete bridge columns
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| GB/T 7714 | Aloisio, Angelo , Lavorato, Davide , Xue, Junqing et al. The role of overstrength in welded joints for rebar substitution in damaged RC columns [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 409 . |
| MLA | Aloisio, Angelo et al. "The role of overstrength in welded joints for rebar substitution in damaged RC columns" . | CONSTRUCTION AND BUILDING MATERIALS 409 (2023) . |
| APA | Aloisio, Angelo , Lavorato, Davide , Xue, Junqing , Wu, Jiajie , Rasulo, Alessandro , Briseghella, Bruno et al. The role of overstrength in welded joints for rebar substitution in damaged RC columns . | CONSTRUCTION AND BUILDING MATERIALS , 2023 , 409 . |
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