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学者姓名：薛俊青
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矮塔斜拉桥通常采用对称悬臂法施工,客观条件可能导致该方法无法采用,需要研究非对称悬臂施工的可行性.文章针对双塔双索面预应力混凝土矮塔斜拉桥开展实桥监测,建立有限元模型,分析合理成桥状态和合理施工状态.考虑背景工程无法采用对称悬臂法的实际情况,基于合理施工状态提出边跨现浇段非对称悬臂施工的2种方案,对比采用2种方案完成边跨现浇段施工后对合理施工状态下主梁的挠度、应力及斜拉索索力的影响.结果表明:采用应力平衡法计算成桥恒载弯矩可行域,并以此为约束条件利用基于影响矩阵法原理的未知荷载系数法可计算合理成桥索力;利用考虑施工阶段的未知荷载系数法计算合理初张拉索力及二次张拉索力,可得到合理施工状态;与方案1相比,采用方案2的主梁最大挠度更小且分布更合理,边跨无索区主梁上缘拉应力更小,斜拉索索力分布更均匀;方案2对矮塔斜拉桥的合理施工状态影响较小,最终可达到合理成桥状态.
Keyword ：
有限元分析 有限元分析 未知荷载系数法 未知荷载系数法 桥梁工程 桥梁工程 矮塔斜拉桥 矮塔斜拉桥 非对称悬臂施工 非对称悬臂施工
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| GB/T 7714 | 郭维强 , Bruno BRISEGHELLA , 陈权 et al. 边跨非对称悬臂施工对矮塔斜拉桥合理施工状态影响研究 [J]. | 合肥工业大学学报（自然科学版） , 2025 , 48 (1) : 136-144 . |
| MLA | 郭维强 et al. "边跨非对称悬臂施工对矮塔斜拉桥合理施工状态影响研究" . | 合肥工业大学学报（自然科学版） 48 . 1 (2025) : 136-144 . |
| APA | 郭维强 , Bruno BRISEGHELLA , 陈权 , 薛俊青 , Camillo NUTI . 边跨非对称悬臂施工对矮塔斜拉桥合理施工状态影响研究 . | 合肥工业大学学报（自然科学版） , 2025 , 48 (1) , 136-144 . |
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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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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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The link slabs are structural elements connecting two bridge decks, ensuring structural continuity without altering the simple support scheme of the deck. These elements provide the durability benefits of integral bridges by eliminating expansion joints between beams, which are prone to water infiltration and exposure to degrading agents. The development of link slabs is closely connected to the progress in composite materials. Ultra-High Performance Concrete (UHPC) is a cementitious material capable of ensuring the mechanical performance of link slabs under operational loads, thanks to high resistance and durability. This work presents an extensive experimental characterization of prefabricated link slabs, considering an experimental setup representative of operational conditions. The authors examined nine experimental configurations, varying both the geometry and the material. For geometry, they varied the bolts' edge distance and the thickness of the unbonded layer. For material, they studied link slabs made of Reinforced Concrete (RC), UHPC with randomly oriented fibres, and UHPC with oriented fibres. The effect of the volumetric fraction of fibres was assessed in the slabs with oriented fibres. The results provide practical recommendations for selecting the combination of geometric properties and materials to maximize the mechanical performance of prefabricated UHPC link slabs.
Keyword ：
Durability Durability Fibre reinforcement orientation Fibre reinforcement orientation Link slabs Link slabs Prefabricated bridge elements Prefabricated bridge elements Structural Structural Ultra-High Performance Concrete (UHPC) Ultra-High Performance Concrete (UHPC)
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| GB/T 7714 | Xue, Junqing , Mao, Shengrong , Xu, Wei et al. Experimental characterization of prefabricated link slabs with randomly oriented and oriented-fibres UHPC under multiple geometric configurations [J]. | ENGINEERING STRUCTURES , 2024 , 323 . |
| MLA | Xue, Junqing et al. "Experimental characterization of prefabricated link slabs with randomly oriented and oriented-fibres UHPC under multiple geometric configurations" . | ENGINEERING STRUCTURES 323 (2024) . |
| APA | Xue, Junqing , Mao, Shengrong , Xu, Wei , Aloisio, Angelo , Yang, Zhengxian , Contento, Alessandro et al. Experimental characterization of prefabricated link slabs with randomly oriented and oriented-fibres UHPC under multiple geometric configurations . | ENGINEERING STRUCTURES , 2024 , 323 . |
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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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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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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.
Keyword ：
Continuous joints Continuous joints Finite element analysis Finite element analysis Negative bending moments Negative bending moments Steel-concrete composite bridges Steel-concrete composite bridges UHPC (ultra-high performance concrete) UHPC (ultra-high performance concrete)
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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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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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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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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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