BFRP网格-ECC加固T形钢筋混凝土梁抗剪性能研究

Study on Shear Performance of BFRP Grid-ECC Reinforced T-Shaped RC Beams

摘要:

为研究玄武岩纤维增强复合材料(BFRP)网格-工程水泥基复合材料(ECC)加固T形钢筋混凝土梁的抗剪性能,采用有限元软件ABAQUS研究了BFRP网格的单支截面面积和ECC厚度对BFRP网格-ECC加固T形钢筋混凝土梁抗剪性能的影响。结果表明:增大BFRP网格截面面积可以有效提高梁的抗剪承载力,在实际工程中建议使用单支截面面积为30 mm²的BFRP网格,可使结构具有良好承载力,同时更加节省材料;增加ECC厚度可显著提升梁的抗剪承载力。基于桁架-拱模型推导了BFRP网格-ECC加固T形梁抗剪承载力计算公式,模拟值与计算值偏差小于8%,计算结果与模拟值吻合较好。

Abstract:

In order to study the shear performance of T-shaped reinforced concrete (RC) beams reinforced by Basalt Fiber Reinforced Polymer (BFRP) grid-Engineered Cementitious Composite (ECC) (hereinafter referred to as BFRP grid-ECC reinforced T-shaped RC beams), the influence of single branch cross-sectional area and ECC thickness on the shear performance of BFRP grid-ECC reinforced T-shaped RC beams was studied by using the finite element analysis software ABAQUS. The results showed that increasing the cross-sectional area of BFRP grid could effectively improve the shear capa-city of beams. In practical engineering, it is recommended to use the BFRP grid with a single branch cross-sectional area of 30 mm², which can make the structure have good bearing capacity and save more materials. Increasing the thickness of ECC could also significantly improve the shear capacity of beams. Finally, based on the truss-arch model, a formula for calculating the shear capacity of BFRP grid-ECC reinforced T-shaped RC beams was established. The deviation between the experimental and calculated values is less than 8%, and the calculated results are in good agreement with the simulated values.