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基于断裂力学建立了低干缩延性纤维增强水泥基材料(LSECC)/混凝土复合梁的抗弯模型,模拟了不同强度组合、不同LSECC层厚的复合梁抗弯性能。结果表明:在梁底复合低干缩延性材料不仅可提高梁的抗弯承载力,而且大幅提升梁的延性;复合梁的承载力和延性提升与材料强度和LSECC层厚相关;当LSECC强度较上层混凝土强度高时,复合梁的抗弯承载力和延性受LSECC层厚影响显著,随层厚的增加而提高。对不同强度组合、不同LSECC层厚的复合梁实施了三点弯曲试验,模拟结果与试验结果吻合良好。
Based on the fracture mechanics, the bending resistance model of LSECC / concrete composite beam was established, and the flexural behavior of composite beams with different strength combinations and different LSECC layer thicknesses was simulated. The results show that composite material with low dry shrinkage can not only improve the flexural capacity but also improve the ductility of the beam. The bearing capacity and ductility of the composite beam are related to the material strength and LSECC layer thickness. When the strength of LSECC When the strength of the upper concrete is high, the flexural capacity and ductility of the composite beam are significantly affected by the LSECC layer thickness, which increases with the increase of the layer thickness. Three-point bending tests were carried out on composite beams with different strength combinations and different LSECC layer thicknesses. The simulation results are in good agreement with the experimental results.