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| Numerical analysis of tensile fracture of concrete at mesoscale level |
| Revised:March 25, 2004 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20061012 |
| KeyWord:concrete,mesomechanics,numerical simulation,tensile,three-point bending,fracture,beam-particle model |
| ZHANG De-hai ZHU Fu-sheng XING Ji-bo |
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| Abstract: |
| According to physical model of tensile and three-point bending test,the complete processes from the initiation and propagation of micro cracks to the macroscopic failure of concrete specimen were simulated by BPM2D(Beam-Particle Model).Three types of beam in BPM2D have been used to form numerical model of concrete at mesoscale level and the mechanical properties of every typal beam are randomly allocated according to Weibull distribution to reflect the initial heterogeneity of concrete at mesoscale level.It worked out the tensile stress-strain curve,the load-displacement diagram,the maximal stress distribution figures and the crack history figure during the deformation and failure process of the concrete specimen.The numerical simulation results show that the initiation,propagation and linking each other of crack in concrete samples at mesoscale level produce the macro-failure of concrete samples.Based on the analysis of simulated results,it revealed that tensile stress at the crack tip is the driving force for the crack propagation,and the heterogeneity of mechanical property of material among concrete influences greatly on the curvilinear of crack propagation path. |
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