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学者姓名：薛俊青
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Abstract ：
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 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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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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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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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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| GB/T 7714 | Lin, Jianhui , Briseghella, Bruno , Xue, Junqing et al. Temperature Monitoring and Response of Deck-Extension Side-by-Side Box Girder Bridges (vol 34, pg 1, 2019) [J]. | JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES , 2023 , 37 (6) . |
| MLA | Lin, Jianhui et al. "Temperature Monitoring and Response of Deck-Extension Side-by-Side Box Girder Bridges (vol 34, pg 1, 2019)" . | JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES 37 . 6 (2023) . |
| APA | Lin, Jianhui , Briseghella, Bruno , Xue, Junqing , Tabatabai, Habib , Huang, Fuyun , Chen, Baochun . Temperature Monitoring and Response of Deck-Extension Side-by-Side Box Girder Bridges (vol 34, pg 1, 2019) . | JOURNAL OF PERFORMANCE OF CONSTRUCTED FACILITIES , 2023 , 37 (6) . |
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Abstract ：
The integral abutment bridge (IAB) is a jointless bridge with a rigid connection between the superstructure and abutment. The thermal induced expansion and contraction of the superstructure in IABs are constrained by the substructure and backfill. Due to different soil conditions, temperature variations, and construction technologies in different countries, there is no unified design standard for IABs. An IAB with continuous prestressed concrete (PC) T-girders was selected as a case study. A finite element model (FEM) was implemented in Midas/Civil. The accuracy of the FEM was verified by static and dynamic load test results. Based on the verified FEM, the performance of the IAB with standard continuous PC T-girders (30 m) in China was analyzed. It was found that the performance of the IAB with standard continuous PC T-girder (30 m) meets the requirements of the latest Chinese specifications by increasing the number of steel strands in existing prestressed tendons and adding additional prestressed tendons. A modified standard continuous PC T-girder (30 m) for IABs according to the latest Chinese specifications was proposed, which can promote the application of IAB in China. © 2022 the Author(s).
Keyword ：
Abutments (bridge) Abutments (bridge) Dynamic loads Dynamic loads Load testing Load testing Prestressed concrete Prestressed concrete Specifications Specifications Wire Wire
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| GB/T 7714 | Xue, J.Q. , Shao, H. , Ma, S. et al. Proposal of a continuous PC T-girder for integral abutment bridges [C] . 2023 : 1297-1302 . |
| MLA | Xue, J.Q. et al. "Proposal of a continuous PC T-girder for integral abutment bridges" . (2023) : 1297-1302 . |
| APA | Xue, J.Q. , Shao, H. , Ma, S. , Briseghella, B. , Huang, F.Y. . Proposal of a continuous PC T-girder for integral abutment bridges . (2023) : 1297-1302 . |
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As a new type of environmentally friendly lightweight composite material, rubber sand mixture has a wide application prospect in the field of engineering vibration isolation. In order to reveal the variation law of dynamic characteristics of different rubber sand mixtures, based on the dynamic triaxial test, the effects of rubber content and confining pressure on the backbone curve, dynamic shear modulus and damping ratio of mixtures were studied. The results showed that with an increase in the rubber content, the backbone curve of rubber sand mixture had a trend of ' ductile failure ' and the dynamic shear modulus of mixture decreased. The nonlinear coordinated variation could be found between the damping ratio and rubber content with a characteristic threshold of 40 %. The mechanical properties of rubber particles may be influenced by changing the type of ' skeleton structure' inside the sample. © 2023 IABSE. Published by American Chemical Society.
Keyword ：
Damping Damping Ductile fracture Ductile fracture Elastic moduli Elastic moduli Rubber Rubber Sand Sand Shear flow Shear flow Shear strain Shear strain
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| GB/T 7714 | Li, Zhen , Briseghella, Bruno , Xue, Junqing et al. Experimental study on dynamic characteristics of rubber sand mixtures [C] . 2023 : 183-190 . |
| MLA | Li, Zhen et al. "Experimental study on dynamic characteristics of rubber sand mixtures" . (2023) : 183-190 . |
| APA | Li, Zhen , Briseghella, Bruno , Xue, Junqing , Yang, Zhengxian , Huang, Fuyun . Experimental study on dynamic characteristics of rubber sand mixtures . (2023) : 183-190 . |
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Abstract ：
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 ：
Abutments (bridge) Abutments (bridge) Beams and girders Beams and girders Diaphragms Diaphragms Finite element method Finite element method Piers Piers
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| GB/T 7714 | Briseghella, Bruno , Shi, Jinhua , Xue, Junqing et al. Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge [C] . 2023 : 221-228 . |
| MLA | Briseghella, Bruno et al. "Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge" . (2023) : 221-228 . |
| APA | Briseghella, Bruno , Shi, Jinhua , Xue, Junqing , Huang, Fuyun , Miao, Jianbao , Wang, Xu . Influence of Girder Connection Type on Mechanical Performance of Multispan Semi-integral Abutment Bridge . (2023) : 221-228 . |
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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 ：
ABAQUS ABAQUS Abutments (bridge) Abutments (bridge) Finite element method Finite element method Natural frequencies Natural frequencies Piles Piles Seismic waves Seismic waves Seismology Seismology Software testing Software testing
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| GB/T 7714 | Briseghella, Bruno , Fu, Ruihuan , Xue, Junqing et al. Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs [C] . 2023 : 101-109 . |
| MLA | Briseghella, Bruno et al. "Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs" . (2023) : 101-109 . |
| APA | Briseghella, Bruno , Fu, Ruihuan , Xue, Junqing , Aloisio, Angelo , Nuti, Camillo . Numerical Study on Influence of Mass on Dynamic Performance of Piles with Pre-hole Seismic Isolation System in IABs . (2023) : 101-109 . |
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