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Mesoscopic Modeling Approach and Application for Steel Fiber Reinforced Concrete under Dynamic Loading:A Review

Engineering 2022年第9期16卷 220-238页

作者： Jinhua Zhang zhangyu wu Hongfa Yu Haiyan Ma Bo Da School of Civil Engineering Southeast UniversityNanjing 210096China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Steel fiber reinforced concrete(SFRC)has drawn extensive attention in recent years for its superior mechanical response to dynamic and impact *** on the existing test results,the highstrength steel fibers embedded in a concrete matrix usually play a strong bridging effect to enhance the bonding force between fiber and the matrix,and directly contribute to the improvement of the post-cracking behavior and residual strength of *** gain a better understanding of the action behavior of steel fibers in matrix and further capture the failure mechanism of SFRC under dynamic loads,the mesoscopic modeling approach that assumes SFRC to be composed of different mesoscale phases(i.e.,steel fibers,coarse aggregates,mortar matrix,and interfacial transition zone(ITZ))has been widely employed to simulate the dynamic responses of SFRC material and structural *** paper presents a comprehensive review of the state-of-the-art mesoscopic models and simulations for SFRC under dynamic *** approaches for the SFRC mesoscale model in the simulation works,including steel fiber,coarse aggregate,and the ITZ between them,are reviewed and compared *** material models for different phases and the interaction relationship between fiber and concrete matrix are summarized ***,some example applications for SFRC under dynamic loads(i.e.,compression,tension,and contact blast)simulated using the general mesoscale models are ***,some critical analysis on the current shortcomings of the mesoscale modeling of SFRC is highlighted,which is of great significance for the future investigation and development of SFRC.

关键词： Steel fiber reinforced concrete Mesoscale modeling Dynamic loading Materials model Interfacial characteristic

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Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size on the Splitting-Tensile Properties of Coral Aggregate Concrete

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Engineering 2022年第10期17卷 110-122页

作者： zhangyu wu Jinhua Zhang Hongfa Yu Qin Fang Haiyan Ma Li Chen Department of Civil and Airport Engineering Civil Aviation CollegeNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering Southeast UniversityNanjing 210096China Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing 211189China Army Engineering University of PLA Nanjing 210007China

The use of coral aggregate concrete(CAC)as a novel construction material has attracted significant attention for the construction of reef engineering *** investigate the static splitting-tensile behaviors of CAC under the influence of two factors,namely specimen geometry and bearing strip size,a three-dimensional(3D)mesoscale modeling approach with consideration for aggregate randomness in shape and distribution was adopted in this *** established 12 different specimen models with two specimen shapes(i.e.,a cube with an edge length of 150 mm and a cylinder with dimensions ofφ150 mm×300 mm)and six strip widths(i.e.,6,9,12,15,18,and 20 mm)for *** effects of specimen geometry and strip width on the splitting-tensile properties of CAC,such as failure processes,final failure patterns,and splitting-tensile strength(fst),are analyzed and discussed *** results indicate the high reliability of the developed mesoscale modeling approach and reveal the optimal computational parameters for simulating and predicting the splitting-tensile properties of *** fstvalues of CAC are associated with both the specimen geometry and width of the bearing *** fstvalues of the cube model are slightly higher than those of the cylinder model for the same bearing strip size,representing geometry effects that can be explained by differences in fracture ***,the fstvalue of CAC gradually increases with the relative width of the bearing strip ranging from 0.04 to *** on the elastic solution theory,the variation area of CAC fstvalues with the relative width of the bearing strip was determined preliminarily,which has great significance for studying the tensile performance of CAC.

关键词： Coral aggregate concrete 3D mesoscopic modelling Splitting-tensile test Tensile strength Specimen geometry Bearing strip

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Effect of Carbonation and Drying-Wetting Cycles on Chloride Diffusion Behavior of Coral Aggregate Seawater Concrete

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Journal of Ocean University of China 2022年第1期21卷 113-123页

作者： DA Bo LI Yipeng YU Hongfa MA Haiyan CHEN Haoyu DOU Xuemei wu zhangyu College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai UniversityNanjing 210098China Nantong Institute of Marine and Offshore Engineering Hohai UniversityNantong 226300China CCCC Infrastructure Maintenance Group Company Limited Beijing 100010China

Based on seawater immersion,drying-wetting cycles,carbonation and drying-wetting cycles for coral aggregate sea-water concrete(CASC)with different strength grades,the effect of carbonation and drying-wetting cycles on chloride diffusion be-havior of CASC is *** results show that the free surface chloride concentration(Cs),free chloride diffusion coefficient(Df)and time-dependent index(m)of CASC in the drying-wetting cycles is obviously higher than that in seawater *** Df and m of CASC of carbonation and drying-wetting cycles is higher than that in the drying-wetting *** increases the Df and m of CASC,which is against CASC to resist chloride *** corrosion possibility of CASC structures in different ex-posed areas is as follows:splash zone(carbonation and drying-wetting cycles)>tidal zone(drying-wetting cycles)>underwater zone(seawater immersion).Besides,the chloride diffusion rate of C65-CASC is 17.8%-63.4%higher than that of C65-ordinary aggre-gate concrete(OAC)in seawater immersion(underwater zone).Therefore,anti-corrosion measures should be adopted to improve the service life of CASC structure in the oceanic environment.

关键词： coral aggregate seawater concrete chloride diffusion seawater immersion drying-wetting cycles carbonation and drying-wetting cycles

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Influence of steel corrosion on axial and eccentric compression behavior of coral aggregate concrete column

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1415-1425页

作者： Bo DA Yan CHEN Hongfa YU Haiyan MA Bo YU Da CHEN Xiao CHEN zhangyu wu Jianbo GUO State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai UniversityNanjing 210098China Guangxi Key Laboratory of Disaster Prevention and Engineering Safety Guangxi UniversityNanning 530004China Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To study the behavior of coral aggregate concrete(CAC)column under axial and eccentric compression,the compression behavior of CAC column with different types of steel and initial eccentricity(ei)were tested,and the deformation behavior and ultimate bearing capacity(Nu)were *** results showed that as the ei increases,the Nu of CAC column decreases ***,the steel corrosion in CAC column is severe,which reduces the steel section and steel strength,and decreases the Nu of CAC *** durability of CAC structures can be improved by using new organic coated *** the influence of steel corrosion and interfacial bond deterioration,the calculation models of Nu under axial and eccentric compression were presented.

关键词： coral aggregate concrete column axial compression eccentric compression steel corrosion calculation model

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Analysis and experiment of a vessels shell cover in submarine structure

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Journal of Marine Science and Application 2004年第1期3卷 14-19页

作者： zhangyu-li ZENGGuang-wu DepartmentofNavalArchitectureandOceanEngineering HuazhongUniversityofScienceaadTechnologyWuhan430074China

This paper aims to achieve analysis and experiment resuhs that relate to mechanics capability and structural parameter of a special saddle shell of revolution. Theoretically speaking, the saddle shell of revolution consists of a toroidal shell and a spherical shell. The shells simultaneous equations can be solved with harmonious terms. Where, the fundamental equations can be solved by as-ymptotic exponential perturbation method. The equations of special solution can be solved by Hovozhilovs special solution. This new idea is from a study of some existing solutions of the toroidal shell. The resuhs have been proved by compared with some experimental results. The experiments aims to study the effect caused by change of material parameter, or by change of different geometric dimensions of the saddle shell, which include the change of thickness, the change of radius of shell, and the change of ribs. Finally, the accepted product of the saddle shell were reinforced by a toroidal rib has been submitted.

关键词： saddle toroidal shell spherical shell experiment rib perturbation method

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Experimental and mesoscopic investigation on the dynamic properties of coral aggregate concrete in compression

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Science China(Technological Sciences) 2021年第6期64卷 1153-1166页

作者： wu Zhang Yu ZHANG JinHua YU HongFa FANG Qin CHEN Li YUE ChengJun Department of Civil and Airport Engineering Civil Aviation CollegeNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering Southeast UniversityNanjing 210096China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing 211189China Department of Civil Engineering Army Engineering University of PLANanjing 210007China

To investigate the dynamic responses and comprehending the damage mechanism of coral aggregate concrete(CAC) in compression, both the experimental and numerical investigations were implemented in the present work. Firstly, the dynamic mechanical properties of CAC at different strain rates were tested through the Split-Hopkinson pressure bar(SHPB) ***, the effects of concrete strength grade and strain rate on CAC were discussed and analyzed. Subsequently, we developed the three-dimensional(3D) random mesoscale model considering the randomness of aggregate shape, size and distribution at meso-level, which was validated and employed in the numerical simulation of CAC in compression. The results indicate that the splitting failure passing through the coral aggregate is CAC’S primary failure mode. It has been found that the failure pattern, deformation process, and dynamic increasing factor of CAC are associated with both the strain rate and concrete strength grade. Furthermore, by comparing the experimental and mesoscopic results, it has been proven to be reliable to employ the developed 3D mesoscale modelling method to simulate CAC’s dynamic performances, which has enormous potential in future research of CAC under intense dynamic loadings.

关键词： coral aggregate concrete 3D mesoscopic modelling SHPB strain rate DIF

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仿生高韧水泥基复合材料制备技术及增韧机理

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东南大学学报（自然科学版） 2024年第1期54卷 1-8页

作者：吴彰钰佘伟缪昌文东南大学材料科学与工程学院南京211189 江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室南京210008

为了提升混凝土基体的韧性,基于贝壳珍珠层独特“砖-泥”结构,采用水泥石与有机聚合物制备出具有仿生“砖-桥-泥”结构的高韧水泥基复合材料.通过三点弯曲试验、扫描电子显微镜及有限元模拟方法研究了仿生水泥基材料的抗折强度、韧性及... 详细信息

为了提升混凝土基体的韧性,基于贝壳珍珠层独特“砖-泥”结构,采用水泥石与有机聚合物制备出具有仿生“砖-桥-泥”结构的高韧水泥基复合材料.通过三点弯曲试验、扫描电子显微镜及有限元模拟方法研究了仿生水泥基材料的抗折强度、韧性及增韧机理.结果表明,相较于传统水泥的脆性断裂模式,仿生水泥基材料表现出明显的延性断裂特征,包括峰后曲线渐进下降、跨中挠度大幅增加等.基于有机聚合物的多尺度桥接-伸展效应,仿生水泥基材料内部呈现明显的裂纹偏转及分支现象,体现了仿生“砖-桥-泥”结构的内外协同增韧机制.仿生水泥基材料能够在保证95%抗折强度的基础上,将水泥基体的韧性提高179.45%,可为解决混凝土增韧降脆问题提供新的技术路径.

关键词：水泥基复合材料聚合物仿生增韧 “砖-泥”结构数值模拟

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Effect of carbonation-drying-wetting on durability of coral aggregate seawater concrete

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Journal of Southeast University(English Edition) 2021年第1期37卷 67-74页

作者： Da Bo Yu Hongfa Ma Haiyan Dou Xuemei wu zhangyu Chen Yan College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China Yangtze Institute for Conservation and Development Hohai UniversityNanjing 210098China Nantong Institute of Marine and Offshore Engineering Hohai UniversityNantong 226300China Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai UniversityNanjing 210098China Department of Civil Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Based on the drying-wetting cycles experiment and the carbonation-drying-wetting cycles experiment for coral aggregate seawater concrete(CASC)with different strength grades,the effects of carbonation-drying-wetting on the durability of CASC are studied with the surface state,mass loss rate,relative dynamic elastic modulus,ultrasonic wave velocity and cube compressive strength as *** show that the mass loss rate of CASC increases gradually with the increase in cycle times in the drying-wetting and carbonation-drying-wetting *** mass loss rate increases relatively slowly at the initial stage but it increases remarkably after 10 *** relative dynamic elastic modulus and ultrasonic wave velocity decrease gradually with the increase in cycle *** 6 cycles,the decrease rate of the relative dynamic elastic modulus and ultrasonic wave velocity of CASC tends to be flat and the surface is slightly *** with the initial 28 d cube compressive strength,the cube compressive strength of CASC decreases by 8.8%to 11.0%.Drying-wetting cycles and carbonation can accelerate seawater erosion on CASC,and drying-wetting cycles result in salting-out and accelerate the destruction of ***,the carbonation-drying-wetting accelerates the destruction of CASC.

关键词： coral aggregate seawater concrete drying-wetting cycles carbonation-drying-wetting cycles mass loss rate relative dynamic elastic modulus ultrasound wave velocity

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阻锈剂种类对珊瑚混凝土中钢筋锈蚀的影响

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哈尔滨工程大学学报 2019年第10期40卷 1735-1740页

作者：达波余红发麻海燕吴彰钰南京航空航天大学土木工程系

为了提升珊瑚混凝土结构的耐久性能,本文采用线性极化电阻法和交流阻抗谱法,研究了阻锈剂种类及掺量对珊瑚混凝土中钢筋腐蚀性能的影响。结果表明:随着暴露时间的延长,掺加亚硝酸钙阻锈剂、氨基醇类阻锈剂和不掺加阻锈剂的CAC,其自腐蚀... 详细信息

为了提升珊瑚混凝土结构的耐久性能,本文采用线性极化电阻法和交流阻抗谱法,研究了阻锈剂种类及掺量对珊瑚混凝土中钢筋腐蚀性能的影响。结果表明:随着暴露时间的延长,掺加亚硝酸钙阻锈剂、氨基醇类阻锈剂和不掺加阻锈剂的CAC,其自腐蚀电位、极化电阻和电荷转移电阻均逐渐减小,腐蚀电流密度逐渐增大,说明其腐蚀的倾向逐渐增大。无论是掺入亚硝酸钙阻锈剂还是氨基醇类阻锈剂,对普通钢筋的Ecorr、Rp和Rct均有不同程度的提高,表明阻锈剂对钢筋锈蚀起到抑制作用,且阻锈效果随着阻锈剂掺量的增加而逐渐增强。此外,随着暴露时间的延长,亚硝酸钙阻锈剂的阻锈效果衰减速率高于氨基醇类阻锈剂。因此,对于海洋岛礁工程中的珊瑚混凝土结构,采用4%氨基醇类阻锈剂有利于降低锈蚀的速率,延长结构服役寿命。

关键词：珊瑚混凝土钢筋锈蚀线性极化电阻法交流阻抗谱法阻锈剂防腐技术

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全珊瑚海水混凝土中不同种类钢筋的防腐蚀性能

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材料导报 2019年第12期33卷 2002-2008页

作者：达波余红发麻海燕吴彰钰南京航空航天大学土木工程系

采用线性极化电阻法(Linear polarisation resistance method,LPR)和交流阻抗谱法(Electrochemical impedance spectroscopy method,EIS)计算了钢筋的自腐蚀电位(Ecorr)、极化电阻(Rp)、腐蚀电流密度(Icorr)、锈蚀速率(V corr )和电荷转移电阻(Rct)。系统研究了不同种类钢筋对全珊瑚海水混凝土(Coral aggregate seawater concrete,CASC)中钢筋腐蚀性能的影响,提出了CASC中有效的防腐措施。结果表明,不同种类钢筋的 Rp和Rct均随着暴露时间的延长而呈下降趋势, Icorr 均随着暴露时间的延长而呈增大趋势。不同种类钢筋的耐腐蚀性能规律为:2205双相不锈钢>316不锈钢>有机新涂层钢筋>锌铬涂层钢筋>普通钢筋。因此,综合考虑阻锈效果和成本因素,对于海洋岛礁工程中的CASC结构,建议选用有机新涂层钢筋,混凝土保护层厚度至少为5.5 cm,混凝土强度等级为C50及以上,掺加亚硝酸钙阻锈剂。这样,有利于延迟钢筋开始腐蚀的时间,降低锈蚀速率,达到延长结构服役寿命的目的。

关键词：全珊瑚海水混凝土线性极化电阻法交流阻抗谱法钢筋种类防腐技术

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