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学者姓名：陈宝春
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Abstract ：
超高性能纤维增强混凝土的单轴本构关系是认识其材料特性和非线性结构设计的基础.本文从本构方程函数模型建立的角度梳理了现有超高性能纤维增强混凝土单轴本构关系的相关研究;发现本构关系经验模型适用于结构设计计算,其中轴拉和轴压本构方程式均宜采用有理分式;本构关系简化模型适用于简化受力分析和数值模拟,其中轴拉宜采用三折线模型,轴压宜采用双折线模型;本构关系损伤模型适用于材料特性研究,其损伤演化函数较多采用Weibull分布.此外,还发现现有各种研究所得的本构方程中均不包含纤维相关参数,不能充分体现钢纤维的重要影响.因此,针对 3种长径比、6种体积率的超高性能纤维增强混凝土进行轴拉和轴压试验,分析纤维对本构关系的影响.结果表明:超高性能纤维增强混凝土的轴拉和轴压本构关系经验模型均采用有理分式更适合,结合试验与收集的文献数据分析了纤维对经验模型本构方程系数的影响,提出了单轴本构关系经验模型的方程式;还探究了钢纤维参数对单轴损伤本构关系的影响,试验结果表明,钢纤维增强因子与损伤模型的控制系数间存在较强相关性,以试验数据为基础,数值分析得到钢纤维参数与本构方程控制系数间的关系式,进而提出包含钢纤维参数的轴拉和轴压损伤本构方程;并收集文献数据进行验证和修正,结果表明本文提出的本构方程与试验结果更吻合.
Keyword ：
体积率 体积率 本构关系 本构关系 超高性能纤维增强混凝土 超高性能纤维增强混凝土 轴压 轴压 轴拉 轴拉 钢纤维 钢纤维 长径比 长径比
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| GB/T 7714 | 邓金岚 , 杨简 , 陈宝春 et al. 超高性能纤维增强混凝土单轴本构关系和钢纤维增强作用对其影响 [J]. | 复合材料学报 , 2024 , 41 (2) : 911-924 . |
| MLA | 邓金岚 et al. "超高性能纤维增强混凝土单轴本构关系和钢纤维增强作用对其影响" . | 复合材料学报 41 . 2 (2024) : 911-924 . |
| APA | 邓金岚 , 杨简 , 陈宝春 , 徐港 , 李洋 . 超高性能纤维增强混凝土单轴本构关系和钢纤维增强作用对其影响 . | 复合材料学报 , 2024 , 41 (2) , 911-924 . |
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Abstract ：
超高性能混凝土(Ultra-high performance concrete, UHPC)单轴拉伸(直拉)试验是分析UHPC抗拉性能和直拉本构关系的基础性试验，经过对其试件形状与尺寸的优化，试验成功率已得到了较大提升。但由于试件连接方式和局部加强方式的差异，各机构试验成功率参差不齐。为进一步保证直拉试验成功率，采用试验研究和数值模拟的方法系统分析了常见的四种试件连接方式和三种试件局部加强方式对试验成功率的影响，比选出最优试验方法。结果表明：面内夹持装置具有连接可靠、操作简单的优点，适合推广。但夹具的尺寸加工误差或微变形可能导致其与试件的接触面变窄、加剧夹持引发的试件应力集中，致使主裂纹位于测距范围之外；试件与夹具的接触区域进行柔性加强(粘贴碳纤维布)和刚性加强(粘贴铝片)均能有效解决上述问题，提高试验成功率。此外，采用比选的直拉试验方法，探究了钢纤维长径比和体积率对UHPC直拉损伤本构关系的影响。通过声发射(Acoustic emission, AE)监测探究了UHPC在直拉荷载作用下的损伤演化规律，利用声发射参数(累积计数比)构建损伤因子，得到了考虑钢纤维影响的UHPC直拉损伤本构关系。
Keyword ：
加强方式 加强方式 直拉本构关系 直拉本构关系 直拉试验 直拉试验 超高性能混凝土 超高性能混凝土 连接装置 连接装置 钢纤维特征参数 钢纤维特征参数
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| GB/T 7714 | 杨简 , 李洋 , 陈宝春 et al. UHPC直拉试验方法与本构关系研究 [J]. | 材料导报 , 2024 , 38 (06) : 159-167 . |
| MLA | 杨简 et al. "UHPC直拉试验方法与本构关系研究" . | 材料导报 38 . 06 (2024) : 159-167 . |
| APA | 杨简 , 李洋 , 陈宝春 , 徐港 , 黄卿维 . UHPC直拉试验方法与本构关系研究 . | 材料导报 , 2024 , 38 (06) , 159-167 . |
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Abstract ：
将预制的UHPC槽形节段通过干缝连接和预应力张拉形成槽形梁，再与整体现浇的混凝土板组合成的组合梁，称为预应力UHPC槽形节段与整体式混凝土板组合梁(PUCS-MCS组合梁)。它是一种能充分发挥不同材料的性能、施工方便且整体性能好的新型桥梁结构。为探究其抗剪性能，开展了9根模型梁的试验。分析了接缝数、接缝处剪力键数、剪跨比、UHPC钢纤维体积率、配箍率和纵筋率等参数对试件变形、破坏模式、抗剪承载力的影响；基于试验研究结果，提出了PUCS-MCS组合梁抗剪承载力计算方法。结果表明：PUCS-MCS组合梁均为剪压破坏，所有梁在开裂前的荷载-挠度曲线差异不大，在开裂后刚度不断下降；PUCS-MCS组合梁的抗剪承载力随接缝处剪力键数、UHPC钢纤维掺量、配箍率和纵筋率的增大而增大，随干接缝数量增加和剪跨比的增大而减小，其中影响最显著的是干接缝和剪力键，影响最小的是钢纤维掺量和配箍率，因此PUCS-MCS组合梁可不配箍筋，并可采用较低钢纤维掺量的UHPC。
Keyword ：
受剪性能 受剪性能 整体式混凝土板 整体式混凝土板 组合梁 组合梁 超高性能混凝土 超高性能混凝土 预应力槽形节段梁 预应力槽形节段梁
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| GB/T 7714 | 陈宝春 , 陈逸聪 , 周家亮 et al. 预应力UHPC槽形节段与整体式混凝土板组合梁受剪性能 [J]. | 建筑科学与工程学报 , 2024 , 41 (03) : 54-64 . |
| MLA | 陈宝春 et al. "预应力UHPC槽形节段与整体式混凝土板组合梁受剪性能" . | 建筑科学与工程学报 41 . 03 (2024) : 54-64 . |
| APA | 陈宝春 , 陈逸聪 , 周家亮 , 刘永健 . 预应力UHPC槽形节段与整体式混凝土板组合梁受剪性能 . | 建筑科学与工程学报 , 2024 , 41 (03) , 54-64 . |
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Ultra-high performance fiber reinforcement concrete containing stone powder (SP-UHPFRC) is a kind of ultrahigh performance fiber reinforcement concrete (UHPFRC) prepared by using stone powder waste from stone processing instead of quartz powder. It can reduce the waste of land resources and environmental pollution caused by stone powder accumulation in corresponding areas. This research studies the steel fiber reinforcement mechanism and uniaxial tension constitutive relationship of UHPFRC containing stone powder (SP-UHPFRC) from several scales. In the micro-scale, comparing the results of SEM and XRD of SP-UHPFRC and UHPFRC. it can be found that the influence of adding stone powder in the micro-scale of SP-UHPFRC is mainly manifested in the change of microstructure. After adding stone powder, the hydration products adsorb on the stone powder to form particles, which leads to a decrease in the compactness of the matrix, and the spalling phenomenon of the matrix is more obvious when the steel fiber is pulled out. In the meso-scale, the pullout test of steel fibers with different aspect ratio from the SP-UHPFRC matrix was tested. The results shown that as the aspect ratio of steel fiber increases, both the maximum pullout stress and the tensile strength utilization ratio of steel fiber increase as well. In the macro-small-scale, 18 groups of SP-UHPFRC uniaxial tensile test specimens with 3 kinds of aspect ratios and 6 volume fractions of steel fiber were designed. The effects of steel fiber on the uniaxial tensile properties and constitutive relationship were investigated. The SP-UHPFRC uniaxial tensile constitutive relationship equation including the fiber reinforcement factor is proposed and verified. In the macro-large-scale, the applicability of the uniaxial tensile constitutive relationship in macro-large-scale analysis is discussed by comparing the cracking load of finite element simulation established by using the uniaxial tension constitutive relationship proposed in this paper with the test results of SP-UHPFRC beams.
Keyword ：
concrete concrete Constitutive relationship Constitutive relationship Fiber pull-out test Fiber pull-out test Multi -scale analysis Multi -scale analysis Stone powder Stone powder Ultra -high performance fiber reinforcement Ultra -high performance fiber reinforcement Uniaxial tensile test Uniaxial tensile test
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| GB/T 7714 | Yang, Jian , Luo, Junwei , Xu, Gang et al. Multi-scale study on steel fiber reinforcement mechanism and uniaxial tension constitutive relationship of UHPFRC containing stone powder [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 . |
| MLA | Yang, Jian et al. "Multi-scale study on steel fiber reinforcement mechanism and uniaxial tension constitutive relationship of UHPFRC containing stone powder" . | CONSTRUCTION AND BUILDING MATERIALS 418 (2024) . |
| APA | Yang, Jian , Luo, Junwei , Xu, Gang , Chen, Baochun , Wu, Xiangguo , Wan, Jun et al. Multi-scale study on steel fiber reinforcement mechanism and uniaxial tension constitutive relationship of UHPFRC containing stone powder . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 . |
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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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Abstract ：
Uniaxial tensile test of ultra-high performance concrete(UHPC)is a basic material test to analyze its tensile properties and tensile constitutive relationship. Through optimization of the shape and size of the specimens,the success rate of the test has been greatly improved. However,due to the difference in the connection device and reinforcement method,the success rate of each institution is uneven. In order to further ensure the success rate of the uniaxial tensile test,the influence of four common connection devices and three reinforcement methods on the success rate of the test were systematically analyzed through experimental research and numerical simulation,and the optimal test scheme was selected. The results showed that the in-plane clamping device has the advantages of reliable connection and simple operation,which is suitable for popularization. However,there is a problem that the size processing error or micro deformation of the clamp leads to the narrowing of the contact surface with the specimen,intensifies the stress concentration caused by clamping,and makes it impossible to control the main crack to be located in the measuring range;both flexible reinforcement (paste carbon fiber reinforced polymer)and rigid reinforcement (paste aluminum sheet) of the contact area between the specimen and the fixture can effectively solve the above problems,increase the success rate. In addition,the influence of the aspect ratio and volume fraction of steel fibers on the damage constitutive relationship of UHPC under uniaxial tension was investigated by using the optimal uniaxial tensile test method. The damage evolution law of UHPC under uniaxial tensile load was explored through acoustic emission (AE)monitoring. The damage factor was constructed using AE parameters (cumulative counts ratio),and the uniaxial tensile damage constitutive relationship of UHPC considering the influence of steel fiber was obtained. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
Keyword ：
Acoustic emission testing Acoustic emission testing Aspect ratio Aspect ratio Carbon fiber reinforced plastics Carbon fiber reinforced plastics High performance concrete High performance concrete Numerical methods Numerical methods Steel fibers Steel fibers Tensile testing Tensile testing
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| GB/T 7714 | Yang, Jian , Li, Yang , Chen, Baochun et al. Study on Uniaxial Tensile Test Method and Constitutive Relationship of UHPC [J]. | Materials Reports , 2024 , 38 (6) . |
| MLA | Yang, Jian et al. "Study on Uniaxial Tensile Test Method and Constitutive Relationship of UHPC" . | Materials Reports 38 . 6 (2024) . |
| APA | Yang, Jian , Li, Yang , Chen, Baochun , Xu, Gang , Huang, Qingwei . Study on Uniaxial Tensile Test Method and Constitutive Relationship of UHPC . | Materials Reports , 2024 , 38 (6) . |
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The uniaxial constitutive relation of ultra-high performance fiber reinforced concrete (UHPFRC) is the basis for under-standing its material properties and nonlinear structural design. From the perspective of the constitutive equation function model, this paper reviews the existing research on the uniaxial constitutive relationship of UHPFRC. It was found that the empirical model of constitutive relation is suitable for structural design calculation, and the constitutive equations of uniaxial tension and compression should adopt rational fractions. The simplified model of constitutive relation is suitable for simplified force analysis and numerical simulation. The three-fold line model is suitable for uniaxial tension, and the double-fold line model is suitable for uniaxial compression. The damage model of constitutive relation is suitable for the study of material properties, and the damage evolution function is mostly Weibull distribution. In addition, it is found that the constitutive equations obtained by various existing studies do not contain fiber parameters, which cannot fully reflect the influence of steel fibers. Therefore, uniaxial tension and compression tests were carried out on UHPFRC with three aspect ratios and six volume fractions to analyze the influence of fibers on the constitutive relationship. The results show that the rational fraction is more suitable for the empirical model function of the uniaxial tension and compression constitutive model of UHPFRC. Combined with the test and the collected literature data, the influence of fiber on the coefficient of the empirical model equation was analyzed, and the equation of the empirical model of the uniaxial constitutive relationship was proposed. The influence of steel fiber parameters on the uniaxial damage constitutive relation was also explored. The experimental results show that there is a strong correlation between the steel fiber enhancement factor and the control coefficient of the damage model. Based on the experimental data, the relationship between the parameters of steel fiber and the control coefficient of constitutive equation is obtained by numerical analysis, and then the damage constitutive equations of uniaxial tension and compression including steel fiber variables are proposed. The literature data are collected for verification and correction, indicating that the constitutive relation proposed in this paper is in better agreement with the experimental results. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
Keyword ：
Aspect ratio Aspect ratio Compression testing Compression testing Fiber reinforced materials Fiber reinforced materials High performance concrete High performance concrete Rational functions Rational functions Reinforced concrete Reinforced concrete Steel fibers Steel fibers Structural design Structural design Volume fraction Volume fraction Weibull distribution Weibull distribution
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| GB/T 7714 | Deng, Jinlan , Yang, Jian , Chen, Baochun et al. Uniaxial constitutive relation of ultra-high performance fiber reinforced concrete and the effect of steel fiber reinforcement on it [J]. | Acta Materiae Compositae Sinica , 2024 , 41 (2) : 911-924 . |
| MLA | Deng, Jinlan et al. "Uniaxial constitutive relation of ultra-high performance fiber reinforced concrete and the effect of steel fiber reinforcement on it" . | Acta Materiae Compositae Sinica 41 . 2 (2024) : 911-924 . |
| APA | Deng, Jinlan , Yang, Jian , Chen, Baochun , Xu, Gang , Li, Yang . Uniaxial constitutive relation of ultra-high performance fiber reinforced concrete and the effect of steel fiber reinforcement on it . | Acta Materiae Compositae Sinica , 2024 , 41 (2) , 911-924 . |
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为了解大尺寸预应力UHPC箱梁的抗弯性能，以预应力UHPC公路桥——河北石磁跨线桥为背景，设计、制作1片长30 m的足尺预应力UHPC箱梁模型进行四点弯曲试验，结合有限元计算结果，分析试验现象及裂缝分布、跨中荷载～位移曲线、受拉区UHPC及筋材应力～应变曲线。在此基础上分别考虑普通钢筋配筋情况、预应力筋数、腹板厚度和底板厚度等参数对预应力UHPC箱梁进行结构优化设计研究。结果表明：箱梁破坏时受压区UHPC未压溃、受拉区钢纤维被拔出，裂缝贯通底板；根据荷载～位移曲线，箱梁受力可分为弹性阶段、裂缝发展阶段、裂缝快速发展阶段和破坏阶段；根据应力～应变曲线，受拉区UHPC在纵筋屈服时仍能贡献抗拉能力；试验现象及力学指标实测值均说明了预应力UHPC箱梁抗弯能力还有很大富裕空间，可进一步优化。完全不配置普通钢筋的预应力UHPC箱梁仍能满足抗弯承载能力极限状态设计要求；底部预应力筋数增多可有效提高受压区UHPC的抗压强度利用率；腹板厚度过薄会造成腹板主拉应力过大问题，不宜薄于8 cm;采用体外预应力的方法可有效减薄底板所需厚度。
Keyword ：
抗弯性能 抗弯性能 有限元法 有限元法 破坏形态 破坏形态 结构优化 结构优化 裂缝分布 裂缝分布 足尺模型试验 足尺模型试验 预应力UHPC箱梁 预应力UHPC箱梁
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| GB/T 7714 | 马熙伦 , 唐梓轩 , 陈宝春 et al. 30 m预应力UHPC箱梁抗弯性能试验及结构优化研究 [J]. | 桥梁建设 , 2024 , 54 (03) : 93-99 . |
| MLA | 马熙伦 et al. "30 m预应力UHPC箱梁抗弯性能试验及结构优化研究" . | 桥梁建设 54 . 03 (2024) : 93-99 . |
| APA | 马熙伦 , 唐梓轩 , 陈宝春 , 范冰辉 . 30 m预应力UHPC箱梁抗弯性能试验及结构优化研究 . | 桥梁建设 , 2024 , 54 (03) , 93-99 . |
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This paper presents an experimental study on tensile behavior of steel and ultra-high performance concrete (UHPC) composite structure connected by different connections including epoxy resin adhesive, headed stud, and hybrid of the former two. Thirty-two pull-out tests are conducted by taking the connection type, specimen size and steel fiber content of UHPC as the main parameters. The influences of these main parameters on the failure mode, load-separation behavior, and ultimate resistance of connection are researched. The failure modes of specimens with hybrid connection are UHPC interface debonding and UHPC cone failure, which is identical with the epoxy resin adhesive connection and headed stud connection, respectively. The tensile resistance ratio of headed stud connection to epoxy resin adhesive connection has a significant influence both on the separation performance and tensile resistance of hybrid connection. An empirical equation for predicting the tensile resistance of hybrid connection was proposed by taking the tensile resistance ratio of headed stud to epoxy resin adhesive. The ratio of predicted to test result was 0.973with standard deviations of 0.070. The pull-out tests and analysis of the hybrid connection in steel-UHPC composite structure were still needed to study to get it improved. © 2024 Institution of Structural Engineers
Keyword ：
Adhesives Adhesives Composite structures Composite structures Epoxy resins Epoxy resins Failure modes Failure modes High performance concrete High performance concrete Steel fibers Steel fibers Steel testing Steel testing Structure (composition) Structure (composition) Studs (fasteners) Studs (fasteners) Studs (structural members) Studs (structural members)
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| GB/T 7714 | Li, Cong , Ji, Dai lai , Zhang, Dong et al. Pull-out test of hybrid connection in steel-UHPC composite slab [J]. | Structures , 2024 , 66 . |
| MLA | Li, Cong et al. "Pull-out test of hybrid connection in steel-UHPC composite slab" . | Structures 66 (2024) . |
| APA | Li, Cong , Ji, Dai lai , Zhang, Dong , Chen, Baochun . Pull-out test of hybrid connection in steel-UHPC composite slab . | Structures , 2024 , 66 . |
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The compressive behavior of steel tube reinforced concrete (STRC) columns under eccentric loads was investigated experimentally and numerically in this paper. Primary parameters included the eccentricity ratio, the concrete-filled steel tube (CFST) area ratio, and the longitudinal rebar ratio. This paper analyzed the impacts of these parameters as well as the failure modes, the full-range compression process, and the strain development. Similar to the reinforced concrete (RC) column, the full-range compression process of STRC column under eccentric loads can be divided into three stages, i.e., elastic stage, elastic-plastic stage (cracking stage), and plastic stage (descent stage). The experimental findings showed that, on the near-load side of the STRC column, the outer concrete crushed, and the longitudinal rebars buckled in compression. Conversely, on the far-load side, the concrete exhibited cracking in tension, and the longitudinal rebars exhibited tension. Finite element (FE) analysis results demonstrated that, similar to a RC column, three distinct failure mechanisms can be identified for STRC columns under eccentric loads, i.e., compression-controlled, balanced, and tension-controlled failures. During the compression process, analyses were conducted on the contact stress between the steel tube and concrete, as well as on the load distribution between the inner CFST and the outer RC. The ultimate load of the STRC column decreased with an increase in the eccentricity ratio, while it increased with larger longitudinal rebar ratio and CFST area ratio. Based on the experimental and FE analysis results, a simplified calculation method was developed to determine the eccentricity reduction coefficient for STRC columns.
Keyword ：
CFST area ratio CFST area ratio Eccentricity reduction coefficient Eccentricity reduction coefficient Failure mechanism Failure mechanism Finite element analysis Finite element analysis STRC column STRC column
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| GB/T 7714 | He, Fuyun , Li, Cong , Shen, Wei et al. Compressive behavior of steel tube reinforced concrete column under eccentric loads [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
| MLA | He, Fuyun et al. "Compressive behavior of steel tube reinforced concrete column under eccentric loads" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 219 (2024) . |
| APA | He, Fuyun , Li, Cong , Shen, Wei , Chen, Baochun , Briseghella, Bruno . Compressive behavior of steel tube reinforced concrete column under eccentric loads . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 219 . |
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