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| 1 | Theoretical analysis and experimental investigation on flexural performance of steel reinforced ultrahigh toughness cementitious composite (RUHTCC) beams显示文摘UHTCC (ultrahigh toughness cementitious composite), which is a kind of ultrahigh toughness cemen- titious composites material, exhibits pseudo strain hardening feature when subjected to tension load, and has enormous ductility and prominent crack dispersal ability. Accordingly, UHTCC can improve mechanical behavior of ordinary concrete structure especially its durability, and has been regarded as historical breakthrough to traditional cementitious materials. In this paper, the study focuses on flexure behavior of steel reinforced beam made of UHTCC. Based on the plane section assumption, along with two equilibrium equations of force and moment, the formulae to calculate the flexural load capability for the reinforced ultrahigh toughness cementitious composite (RUHTCC) beam were developed under the assumption that the compression stress- strain relationship in the UHTCC material is a bilinear model. Following this, the simplified formulae were further evolved by effective rectangle stress distribution approach in order to facilitate design of practical engineering. Two effective parameters introduced in effective rectangle approach were determined. The mathematical expressions to evaluate limited rein- forcement ratio, flexural stiffness as well as ductility index were proposed, too. Last, two series of dif- ferent reinforcement ratios of the RUHTCC beams were tested in four-point flexure loading. For com- parison purposes, ordinary RC (reinforced concrete) beams also were prepared. Both moment curva- ture curves and load mid-span displacement curves were recorded and compared with the theoretical calculations. A good agreement between them was found, which validates the proposed theoretical formulae. For ductility index, a slightly big difference between the experimental values and the calcu- lated ones exists. The experimental results show that, compared to control RC beams, the RUHTCC beam can improve both flexural capacity and ductility index, and the degree of improvement will de- crease with the increase in the reinforcement ratio. Particularly, the results also reveal that lager crack width in control beams can be greatly reduced by formation of tightly-spaced fine cracks in UHTCC, which offers more durable structures. | XU ShiLang ZHANG XiuFang | 2009 | Science China(Technological Sciences)2009，52，4： | 18 |
| 2 | Theoretical analysis on bending behavior of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites显示文摘Ultrahigh toughness cementitious composites (UHTCC) obviously show strain hardening property under tensile or bending loading. The failure pattern of the UHTCC components exhibits multiple fine cracks under uniaxial tensile loading with prominent tensile strain capacity in excess of 3%, with merely 60 μm average crack width even corresponding to the ultimate tensile strain state. The approach adopted is based on the concept of functionally-graded concrete, where part of the concrete, which surrounds the main longitudinal reinforcement in a RC (reinforced concrete) member, is strategically replaced with UHTCC with excellent crack-controlling ability. Investigations on bending behavior of functionally-graded composite beam crack controlled by UHTCC has been carried out, including theo- retical analysis, experimental research on long composite beams without web reinforcement, validation and comparison between experimental and theoretical results, and analysis on crack control. In addition to improving bearing capacity, the results indicate that functionally-graded composite beams using UHTCC has been found to be very effective in preventing corrosion-induced damage compared with RC beams. Therefore, durability and service life of the structure could be enhanced. This paper discusses the development of internal force and crack propagation during loading process, and presents analysis of the internal force in different stages, moment-curvature relationship from loading to damage and calculation of mid-span deflection and ductility index. In the end, the theoretical formulae have been validated by experimental results. | XU ShiLang LI QingHua | 2009 | Science China(Technological Sciences)2009，52，2： | 17 |
| 3 | Experimental investigation and analysis on flexural performance of functionally graded composite beam crack-controlled by ultrahigh toughness cementitious composites显示文摘Based on the concept of functionally graded concrete,UHTCC(ultrahigh toughness cementitious composites)material with excellent crack-controlling ability is strategically substituted for part of the concrete,which surrounds the main longitudinal reinforcement in a reinforced concrete member.Investigations on bending behavior of such a functionally graded composite beam crack-controlled by UHTCC(abbreviated as UHTCC-FGC beam)have been carried out.After establishing a theoretical cal-culation model,the paper discusses the results of four-point bending experiment on long composite beams without web reinforcement,and validates the theoretical formulae through experimental results of UHTCC-FGC beams with different thicknesses of UHTCC layer.Besides improving bearing capacity and saving steel reinforcements,the results indicate that UHTCC-FGC beams can also effectively control the deformation and enhance the ductility of members.At last,the optimal thickness of UHTCC layer in UHTCC-FGC beams has been confirmed,which can not only save materials and improve mechanical performance of members,but also be very effective in preventing corrosion-induced damage and enhancing the durability of members by controlling crack width below 0.05mm under service conditions. | LI QingHua XU ShiLang | 2009 | Science China(Technological Sciences)2009，52，6： | 13 |
| 4 | Analytical theory of flexural behavior of concrete beam reinforced with textile-combined steel显示文摘Textile-reinforced concrete (TRC) is a new high performance cementitious composite material,which not only has superior corrosion resistance but also can effectively limit the development of concrete cracks and make the crack width and spacing of concrete become smaller.However,due to the brittle feature of fiber materials,the TRC structural member has no distinct failure symptom when it arrives at its ultimate load.At the same time,ordinary reinforced concrete (RC) elements have large dead weight and can not efficiently restrict the expansion of the main crack of structures because of the restriction of their special cover thickness.In order to overcome the disadvantages of both the TRC and the RC,a new architecture reinforced with textile-combined steel is proposed in this study,making full use of the advantages of the above two structures.The cover concrete at the tension zone of an RC element is partially replaced with TRC and thus the steel reinforcements replaced with textiles are subtracted.Compared with the old one,the new structure has less dead weight and has the merits of service safety and good durability.The flexural development process of the proper beam with this new structure is investigated in this paper and based on the plane section assumption,analytical equations are derived by using nonlinear analysis theory,including the load-carrying capacity at different stages and moment-curvature relationship and mid-span deflection during the entire loading process.Comparison between the calculated and the experimental results reveals satisfactory agreement and thus verifies the feasibility of the equations. | XU ShiLang & YIN ShiPing Department of Civil Engineering,Dalian University of Technology,Dalian 116024,China | 2010 | Science China(Technological Sciences)2010，53，6： | 10 |
| 5 | Numerical simulation and experimental study on electrothermal properties of carbon/glass fiber hybrid textile reinforced concrete显示文摘Carbon/glass fiber hybrid textile reinforced concrete is a relatively new composite material with good mechanical capacity and excellent electrical conductivity.Both small-scale slab heating experiments and numerical simulation are presented in this paper.Temperature variation curves obtained during heating indicate the effects of environmental temperature,heat-conducting layer thickness and electric heating power.Comparison of temperature rising between the situations with and without thermal isolation layer is given as well.The results indicate that the textile can form a good conductive heating network and generate enough heat to raise the temperature in the concrete when connected to a power supply,while the resistance of the slab remains stable during the heating.Numerical results are in good accordance with the experiments.Real time snow-melting experiment was conducted to verify the feasibility of deicing.The electrothermal properties of textile can be utilized for deicing and snow melting in a safe,environmentally friendly and efficient way. | XU ShiLang YU WenTing SONG ShiDe | 2011 | Science China(Technological Sciences)2011，54，9： | 8 |
| 6 | Determination of double-K criterion for crack propagation in quasi-brittle fracture, Part III: Compact tension specimens and wedge splitting specimens显示文摘 | Shilang Xu Hans W. Reinhardt | 1999 | International Journal of Fracture1999，，2： | 2 |
| 7 | Tensile and flexural properties of ultra high toughness cemontious composite显示文摘 | Hedong Li Shilang Xu Christopher K. Y. Leung | 2009 | Journal of Wuhan University of Technology - Mater Sci Ed2009，，4： | 2 |
| 8 | Crack extension resistance based on the cohesive force in concrete 显示文摘 | Reinhardt H W Xu Shilang | 1999 | Engineering Fracture Mechanics1999，64，5： | 1 |
| 9 | A Simplified Method forDetermining Double-K Fracture Parameters for Three-PointBending Tests显示文摘 | XU Shilang REINHARDT H W | 2000 | International Journal of Fracture2000，104，： | 1 |
| 10 | Crack extension resistance and fracture properties of quasi-brittle softening material like concrete based on the complete process of fracture 显示文摘 | Xu Shilang Reinhardt H W | 1998 | International Journal of Fracture1998，92，1： | 1 |
| 11 | Crack Extension Resistanceand Fracture Properties of Quasi - Brittle Softening Materialslike Concrete Based on the Complete Process of Fracture 显示文摘 | XU Shilang REINHARDT H W | 1998 | International Journal of Fracture1998，92，： | 1 |
| 12 | Experimental Determination of KⅡC of Normal Strength Concrete显示文摘 | Xu Shilang | 1998 | Materials and Structures1998，31，209： | 1 |
| 13 | Determination of double-K criterion for crack propagation in quasi-brittle fracture,Part Ⅲ:Compact tension specimens and wedge splitting specimens显示文摘 | Xu Shilang Reinhardt H W | 1999 | International Journal of Fracture1999，98，2： | 1 |
| 14 | Determination of double-K criterion for crack propagation in quasi-brlttle fiaeture, Part Ⅱ : Analytical evaluating and practical measuring methods for three8-point bending notched beams 显示文摘 | Xu Shilang Reinhardt H W | 1999 | Intemational Journal of Fracture1999，98，： | 1 |
| 15 | A simplified method for determining double-K fracture parameters for three-point bending tests显示文摘 | Xu Shilang Reinhardt H W | 2000 | International Journal of Fracture2000，104，2： | 1 |
| 16 | Determination of Double-K Criterion for Crack Propagation in Quasi-Brittle Fracture,Part II:Analytical Evaluating and Practical Measuring Methods for Three-point Bending Notched Beams显示文摘 | Shilang Xu H W Reinhardt | 1999 | International Journal of Fracture1999，98，2： | 1 |
| 17 | E- valuation of fracture parameters of concrete from bending test using inverse analysis approach显示文摘 | ZHANG Jun LEUNG CHRISTOPHER K Y XU Shilang | 2010 | Materials and Structures2010，43，6： | 1 |
| 18 | Determination of double - K criterion forcrack propagation in quasi -brittle tracture, Part Ⅱ : Analytical evalua- ting and practical measuring methods for three point bending notched beams 显示文摘 | Xu Shilang Reinhardt H W | 1999 | International journal of Fracture1999，98，： | 1 |
| 19 | Determination of double-K criterion for crack propagation in quasi-brittle fracture Part I:Experimental investigation of crack propagation显示文摘 | Xu Shilang Reinhardt H W | 1999 | International Journal of Fracture1999，98，11： | 1 |
| 20 | Determination of Double-K Criterion for Crack Propagation in Quasi-brittle Fracture,Part I:Experimental Investigation of Crack Propagation显示文摘 | Xu Shilang Reinhardt H W | 1999 | International Journal of Fracture1999，98，2： | 1 |
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