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学者姓名：薛俊青
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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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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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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 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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The deck expansion devices installed at the abutment can be eliminated by using the concept of the semi-integral abutment bridge (SIAB) to improve the serviceability and durability of the bridge. The mechanical performance of the girders in the SIABs with continuous structure or continuous deck between adjacent girders could be different. To investigate the different response of the two bridge typologies, a SIAB built in China was chosen as a case study. A finite element model (FEM) established by using the MIDAS-Civil software was used to compare the mechanical performance of the continuous structure SIAB or continuous beck SIAB under different load cases. The influence of different girder connection types and bridge lengths on the mechanical performance of a multi-span SIAB was studied. The results showed that the influence of the girder connection types on the internal force of the girder of a two-span SIAB is significant. Compared with the continuous structure SIAB, the absolute bending moments of the girder at the pier top, end diaphragm and mid span of the girder in continuous deck SIAB are lower, however, the shear forces of the girder at the pier top and end diaphragm are higher. With an increase in the bridge length, the continuous structure SIAB is more sensitive to the temperature variation than the continuous deck SIAB. The maximum lengths of the multi-span continuous structure SIAB and the multi-span continuous deck SIAB is 26 m (two-span) and 52 m (four-span), respectively. Copyright © IABSE Symposium Istanbul 2023: Long Span Bridges - Proceeding Book. All rights reserved.
Keyword ：
continuous deck continuous deck continuous structure continuous structure finite element model finite element model maximum length maximum length semi-integral abutment bridge semi-integral abutment bridge
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| GB/T 7714 | Briseghella, B. , Shi, J. , Xue, J. et al. Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge [未知]. |
| MLA | Briseghella, B. et al. "Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge" [未知]. |
| APA | Briseghella, B. , Shi, J. , Xue, J. , Huang, F. , Miao, J. , Wang, X. . Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge [未知]. |
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The expansion devices (expansion joints) can be eliminated in jointless bridges to fundamentally resolve the disease and maintenance and replacement problems caused by the expansion devices. Compared to conventional bridges, jointless bridges without deck expansion joint have the advantages of low maintenance cost, improved ride quality, simple and economical construction, added redundancy and capacity during seismic and other extreme events, etc. The jointless bridges have been widely used in developed countries due to excellent economic and social benefits; however, it is just developing in China. Thus, in order to increase their use in the future, this paper investigates the application of jointless bridges in China. Data of 70 jointless bridges in China are collected, and the bridge types, length, superstructure and substructure types as well as the technology characteristics are analyzed. This paper can provide the necessary reference to the research and application of jointless bridge in the future.
Keyword ：
Application Application Bridge engineering Bridge engineering China China Investigation Investigation Jointless bridge Jointless bridge The state of the art The state of the art
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| GB/T 7714 | Wang, Chenhui , Chen, Baochun , Huang, Fuyun et al. Application of Jointless Bridges in China [J]. | ADVANCES IN CIVIL ENGINEERING MATERIALS , 2023 , 310 : 223-234 . |
| MLA | Wang, Chenhui et al. "Application of Jointless Bridges in China" . | ADVANCES IN CIVIL ENGINEERING MATERIALS 310 (2023) : 223-234 . |
| APA | Wang, Chenhui , Chen, Baochun , Huang, Fuyun , Xue, Junqing , Briseghella, Bruno . Application of Jointless Bridges in China . | ADVANCES IN CIVIL ENGINEERING MATERIALS , 2023 , 310 , 223-234 . |
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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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Integral abutment bridges (IABs) could fundamentally resolve the durability problems of expansion joints. The concrete piles beneath the abutments are the most vulnerable components in IABs. To improve the seismic performance of IABs, the pile with pre-hole filled by damping materials (called pre-hole seismic isolation system) has been proposed. In this paper, the shaking table test of the pre-hole seismic isolation system under sine wave load is simulated by using the finite element software ABAQUS/Explicit. The influence of the mass on the pile top and the pre-hole dimension on the dynamic performance of the pre-hole seismic isolation system was analysed. It can be concluded that with an increase in the mass or pre-hole dimension, the fundamental frequency of the pile-soil system decreased. With an increase in the input wave’s frequency, the pile with a pre-hole seismic isolation system could have a better seismic performance by reducing the mass or pre-hole dimension. Copyright © IABSE Symposium Istanbul 2023: Long Span Bridges - Proceeding Book. All rights reserved.
Keyword ：
dynamic soil-pile interaction dynamic soil-pile interaction finite element model finite element model fundamental frequency fundamental frequency integral abutment bridge integral abutment bridge mass on pile top mass on pile top pile with pre-hole seismic isolation system pile with pre-hole seismic isolation system pre-hole dimension pre-hole dimension
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| GB/T 7714 | Briseghella, B. , Fu, R. , Xue, J. et al. Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs [未知]. |
| MLA | Briseghella, B. et al. "Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs" [未知]. |
| APA | Briseghella, B. , Fu, R. , Xue, J. , Aloisio, A. , Nuti, C. . Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs [未知]. |
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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 columns, there are no mechanics-based probabilistic models of their axial capacity. The present research 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 or available in the literature. Copyright © IABSE Symposium Istanbul 2023: Long Span Bridges - Proceeding Book. All rights reserved.
Keyword ：
Axial capacity Axial capacity concrete-filled steel tubes concrete-filled steel tubes probabilistic capacity model probabilistic capacity model
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| GB/T 7714 | Contento, A. , Aloisio, A. , Xue, J. et al. Probabilistic Capacity Model for Concrete-Filled Steel Tubes [未知]. |
| MLA | Contento, A. et al. "Probabilistic Capacity Model for Concrete-Filled Steel Tubes" [未知]. |
| APA | Contento, A. , Aloisio, A. , Xue, J. , Quaranta, G. , Gardoni, P. , Briseghella, B. . Probabilistic Capacity Model for Concrete-Filled Steel Tubes [未知]. |
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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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