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  • 1
    Electronic Resource
    Electronic Resource
    Damage Constitutive Relationship of SRC Member Nonlinear Analysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 833-836 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The damage constitutive relationship is a key problem to nonlinear analysis of structuralmembers. It is much more necessary to study systematically related damage constitutive relationshipof steel reinforced concrete (SRC) members because of their peculiarity. Based on the experimentalphenomena analysis and damage theory, the mesoscopic failure mechanism of concrete as well as theinterface of shaped steel and concrete is analyzed. At the same time, their mesoscopic damage modelsand corresponding assumptions of the models are established by considering material failurecharacteristics. Subsequently, the mechanism of the models is analyzed, which indicates that they fitto simulate failure process of the materials. According to the models, the related damage constitutiverelationship for SRC members is deduced by principle of energy and force balance. Combined withcorresponding experimental study, it is shown that the constitutive relationship presented isreasonable and practicable, so it facilitates SRC member nonlinear analysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.833.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Seismic Damage Model for Steel Reinforced High Strength and High Performance Concrete Frame Joints (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 837-840 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on damage mechanics and failure model, a seismic damage model applying to steelreinforced high strength and high performance concrete frame joints is put forward, which takesdeformation and cumulative damage into account. The damage performance of five tentative framejoints is compared and analyzed according to deformation and dissipated hysteretic energy underdifferent loading levels, and the main influence factors on damage performance are established. Thedamage indexes of tentative frame joints are calculated, and the influence of strength grade ofconcrete and axial compression ratio on damage performance is discussed. The results indicate thatthe general damage is controlled by the damage of concrete in the earlier stage of loading, and by thedamage of shape steel and stirrup in the later stage of loading; joints with lower axial compressionratio and lower concrete strength grade possess better hysteretic energy performance. Damageanalysis provides an available means for the research of steel reinforced high strength and highperformance concrete frame joints under seismic load. The damage model presented can be areference for seismic damage analysis of the structure, prediction of earthquake damage in future,estimation of economic loss and repair after earthquake
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.837.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Characteristics of Fracture Mechanics for Crack Tip near the Interface between Steel and Concrete in Composite Structures (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 841-844 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Steel-concrete composite structures are widely used in high buildings for its excellentseismic behaviors, whereas faults or cracks, which have great influence on interfacial mechanicalbehaviors of structural members, inevitably form near the interface between steel and concrete duringthe process of molding. Therefore, it is necessary to study the mechanical characteristics of the cracktip near the interface. In this paper, the application scope of the path-independence of J-integral insteel-concrete composite structure with a crack is discussed. According to the conservation law ofJ-integral for the steel-concrete composite structure with a crack parallel to the interface, a hypothesisthat the value of strain energy release rate (SERR) of the mode-$fracture is independent of the cracklocation when the crack is parallel and close to the interface is put forwarded. And this hypothesis isverified through finite element method (FEM). A schematic model for a skew crack near thesteel-concrete interface is provided. The variation law of SERR with the Dundur’s parameters and theangle between crack direction and interface are calculated by FEM. At last, calculating method of thestress intensity factor as well as the SERR for a skew crack near the interface is suggested. All thesemay contribute to further investigation on interfacial mechanical behaviors for steel-concretecomposite structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.841.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical Model for Interfacial Nonlinear Bond Softening Behavior between Embedded Steel and HSHPC (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 845-848 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The latest experimental study on steel reinforced high strength and high performanceconcrete (SRHSHPC) specimens shows that there exists interfacial bond softening phenomenonbetween embedded steel and high strength and high performance concrete (HSHPC), and it makes theshear transfer capacity between shaped steel and HSHPC be progressively reduced. To predictfailure load in design, a theoretical model for interfacial bond softening behavior is required. Asinterfacial bond softening behavior is a nonlinear process involving material properties, it can beanalyzed once the relation of interfacial bond stress (τ ) and slippage ( s ) is known. In this paper, themechanism of interfacial bond-slip is studied, thus a simplified τ − s relation including ascending anddescending parts is proposed and employed to analyze the interfacial nonlinear bond-slip process.Based on the interfacial equilibrium between steel and HSHPC as well as the τ − s relation, the basicgoverning equations in both softened region and elastic region are established and solved for steelstrain or stress. At last, the application of the model is verified through comparison with experimentalresults. The calculating results of the model are found to be in good agreement with experimentalresults, showing that the model can describe the bond-slip process in real material systems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.845.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study on Interfacial Crack Propagation and Fracture between Embedded Steel and HSHPC (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 853-856 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Steel reinforced high strength and high performance concrete (SRHSHPC) specimens wereexperimented to study the mechanical behaviors between steel and concrete interface. In experiment,interfacial bond softening process was observed, which can be explained in terms of damage along theinterface, leading to progressive reduction of shear transfer capability between steel and high strengthand high performance concrete (HSHPC). In this paper, bond softening process along the interface isconsidered in the analysis of crack-induced debonding. Interfacial bond-slip mechanism betweensteel and HSHPC is studied in detail based on fracture mechanics. With the help of acoustic emissionstechnology, the crack propagation in the interlayer was observed, thus the interfacial crackpropagation and fracture model is set up. Under the assumption that the interlayer is weak concretecompared with concrete matrix, the stress field as well as displacement field around the crack tip isdeduced. The characteristics of interfacial fracture process are discussed and a model for interfacialfracture process zone is built up. With this model, the size of fracture process zone can be derived. Atlast, the influence of the fracture process zone on interfacial fracture toughness is determined usingcritical fracture toughness. All these may contribute to improvement of theory for SRHSHPCcomposite structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.853.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental Study on the Shear Behaviors of the SRHSHPC Composite Frame Columns (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 149-152 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The shear behaviors of steel reinforced high strength and high performance concrete(SRHSHPC) composite frame columns are studied through the test on a number of SRHSHPCspecimens with grade of concrete strength varied from C80 to C120 subjected to constant axialcompression and cyclically varying horizontal load. Four influencing factors, namely, shear spanratio, axial compression ratio, stirrup ratio and concrete strength, are taken into consideration in thetest, and strain gauges are respectively placed on steel web, stirrups as well as reinforcement bars tostudy the shear mechanism of SRHSHPC composite columns. According to test results, the shearfailure patterns and shear mechanism of the specimens are discussed. By analyzing the contribution ofthe steel web, concrete, stirrups and reinforcement bars to the shear capacity, the shear mechanism ofthe SRHSHPC composite columns is figured out. Therefore, the influence of shear span ratio, axialcompression ratio, stirrup ratios and concrete strength on shear behaviors of the SRHSHPC framecolumns is clear. Finally, concrete truss model and principle of accumulation are applied to discussthe shear capacity and a calculation model for shear strength of the SRHSHPC composite columns isestablished. It is indicated that the shear behaviors of the SRHSHPC frame composite columns areexcellent, and the calculated results of shear strength have good conformity with test results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.149.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fatigue-Cumulative Damage Model of RC Crane Girders Strengthened with FRP Strips (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 165-168 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The cumulative damage of the reinforced concrete (RC) crane girders occurred byoverload, fatigue and other reasons in service may deteriorate the safety of RC crane girders seriously,so it is necessary to analyze the damage mechanism and rationally reinforce them in good time. In thispaper, RC crane girder strengthened with CFRP strips is taken as a target, and the mechanicalperformance degradation under fatigue load is studied. According to the basic theory of continuumdamage mechanics, a damage variable is defined by flexural rigidity, and fatigue- cumulative damagemodel, which describes the process of damage and fracture, is established. The variation law ofcumulative damage of RC crane girders strengthened with FRP strips under crane load is discussed,and the failure patterns such as concrete cracking, debonding between CFRP strips and concrete, yieldof steel bars etc., are studied. The criterion which can be used to estimate the cumulative damagedegree of strengthened RC crane girders is proposed. Finally, the evolution of the fatigue damage inthe RC crane girders strengthened with CFRP strips is numerically simulated, and the results showthat the proposed model can correctly describe the damage and failure process of strengthened RCcrane girders. The research will provide a reference for the damage analysis and reinforcement of RCcrane girders strengthened with CFRP strips
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.165.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Damage Analysis of the SRHSHPC Frame Columns under Low Cyclic Reversed Horizontal Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 97-100 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on tests under low cyclic reversed horizontal loading, damage behaviors of steelreinforced high strength and high performance concrete (SRHSHPC) frame columns are analyzed.The strength attenuation that considered as damage variable is figured out, and the influence of axialcompression ratio, shear span ratio, stirrup ratio and concrete strength on the strength attenuation isdiscussed. The accumulative damage model, which can reveal the effect of cyclic loading andmaximum deformation, is established for the SRHSHPC frame columns. The different phases ofdamage growth and their features for the SRHSHPC frame columns are analyzed, and the relation ofdamage and displacement is ascertained. Furthermore, the influence of axial compression ratio, shearspan ratio, stirrup ratio and concrete strength on the damage development is also discussed. Theresults show that the damage model could give a rational description for damaging process of theSRHSHPC frame columns
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.97.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamic Damage Analysis of SRC Frame Structure under Earthquake Action (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 373-376 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Structures may enter into nonlinear stage under strong earthquake, so precise prediction ofnonlinear behavior for building structure in earthquake is important which can assess the earthquakeresistance safety of structures accurately. The exact numerical analysis model is required in actualengineering. In this paper the concept of nonlinear dynamic damage is introduced in steel reinforcedconcrete (SRC) composite structure, based on the theory of continuous damage mechanics. Thedamage variable is defined and computed by effective plastic strain of material, furthermore, concretedynamic constitutive model is derived which considered plastic strain of material. Finally, the damagedynamic balance equation is established. Via comparison with test results of a three-story, two-baySRC frame model which is tested on a shaking table, it is shown that the results of numerical analysisagree well with test results, indicating that the nonlinear dynamic balance equation is capable ofdescribing the dynamic response of SRC frame structure with satisfactory accuracy. The researchsupplies theoretical basis for the seismic behavior analysis of SRC high-rise buildings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.373.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental Study on Seismic Damage Model of the SRHSHPC Composite Frame Columns (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 145-148 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on experimental investigation under low cyclic reversed loading, the seismicbehaviors and seismic damage model for steel reinforced high strength and high performanceconcrete (SRHSHPC) composite frame columns are studied. Several existing seismic damage modelsare firstly presented and their characteristics are comparatively analyzed. From the test results of lowcyclic reversed loading, the variation history of cumulative dissipated hysteretic energy of theSRHSHPC composite frame columns under different loading cycle levels is figured out, and theinfluence of axial compression ratio, shear span ratio, stirrup ratio and concrete strength on thecumulative dissipated hysteretic energy is also discussed. The damage index of the SRHSHPCcomposite frame columns is compared according to the existing seismic damage models, and theseismic damage model adapted for the SRHSHPC composite frame columns is established.According to the variation history of the damage index under different loading cycle levels, the rule ofdamage development for the SRHSHPC composite frame columns is proposed. The influence of axialcompression ratio, shear span ratio, stirrup ratio and concrete strength on the damage development isalso discussed. The results indicate that the seismic behaviors of the SRHSHPC composite framecolumn are outstanding, and the seismic damage model could give a quantitative description fordamaging process of the samples, which is reference for establishing more rational damage criteria forthe SRHSHPC earthquake-resistant composite structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.145.pdf
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