 Posted: Wed 13:05, 05 Jan 2011 Post subject: Full grade aggregate concrete beam flexural stress |
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| Full grade aggregate concrete beam flexural stress - strain curve of the micro-mechanical simulation
Test (see Figure 7) to take four span beam with 450mm ~ 450mm micro-mesh region to region,moncler jackets, according to WalravenJ. 【3】 C formula to determine particle size of micro-region on behalf of 34 satellites 05O505O22220 No. 2 Tianrui Jun, et al: full grade aggregate concrete beam flexural stress-strain curve of Figure 6, three micro-mechanical simulation of concrete beams with crack propagation in ll11l5jIi --- 45O ----- Bu Bu Bu --- 45O ---- · --- 450 ----- lI ● · a,moncler 2011, lI:: Z: e Figure 7, four with signal beam bending test (mm) grains, the calculated,oakley brillen, large aggregates 3, size 120mm, large aggregates 12. Diameter of 60mm, in the aggregate 35, diameter of 30mm, the small aggregate 167, particle size l5mm. Split across the micro-grid to take the side of 3.75mm. Gradually expanded to the two ends, both ends of the concrete side of triangle meshes, respectively, the two right-angle long 80,30 mm. Bearing outer grid is 175mmx30mm. Application of self programming 2Dbeammesh. The finite element mesh generated for Figure 8 Figure 8 four element mesh of concrete beams with subdivision taking into account the large aggregate and bonding properties of cement mortar worse than the large aggregate. In this example. The large aggregate and cement mortar tensile strength of the interface unit is taken as 1.6MPa. Other parameters same as Table 1. Application of nonlinear finite element program self 2Dbeamstatic. for the analysis of the beam, in order to reduce computation, select the initial displacement step size 0.002mm. After injury unit appears to 0.0005mm four steps with a load of concrete beams deflection curve shown in Figure 9. Beam bending stress-strain curve shown in Figure 1O beam ultimate load / 9 =- 168.3974kN; beam bending strength = 2,ghd stijltang iv,494776 MPa. The results are given in the literature of four 【4】 static limit load of concrete with 154.7 ~ 171.6kN and bending strength within the range 2.3 ~ 2.54MPa. 3 Conclusion f1) Based on the micromechanics level. Random aggregate model and two-fold child \ sole pursuit of child \ type hail Figure 9, four concrete beams with the load deflection curve of a bending strain / lO 'Figure 10,UGG Boots Outlet, four concrete beams with a bending stress-strain curve line injury model. Three and four respectively with concrete beam with a four-point bending test was simulated. The results with the relevant experimental results. Indications of the load displacement is feasible. (2) of each phase of concrete parameters on micro-mechanical calculation results are very important. Especially the bond with a direct impact on the parameters of the beam bending strength. I had several parameter values. Finally selected in good agreement with the experimental results of the parameters. (3) to compare the two graded concrete beam deflection curve of a known load. With the improvement of concrete beam grading. The ultimate load gradually enhanced. A corresponding increase in the corresponding deflection. Descending gradually become shorter and f4) were compared graded concrete beam bending stress-strain curve indicated. With the improvement of concrete beam grading. The bending strength decreased, corresponding to the lower edge of the tensile strain decreases. The descending curve of variable length and gradually leveling off. (5) we can see from Figure 6. After reaching the ultimate load of beams. Cracks in concrete surface along the shear slip and aggregate particles cracks continue to extend the expansion. At this time mainly depends on the carrying capacity of the bite force slip plane. Beam performance of the final destruction of a main crack through concrete beam cross-section. Showed strong tensile strain softening and localization phenomena |
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