FRP增强重组竹梁受弯性能数值模拟
Numerical simulation on bending performance of FRP reinforced bamboo beams

通过有限元软件ABAQUS对纤维增强聚合物基复合材料（FRP）增强重组竹梁受弯性能进行了分析，有限元模拟结果与试验结果相一致，两者荷载-位移曲线相吻合，跨中截面应变发展过程基本一致，70 kN荷载时，截面应变误差在13.96%内，承载力预测具有很好的精度，预测最大误差为9.04%，FRP的增强使竹梁截面的应力重新分布，受压区竹材得到更加充分的利用；进一步参数化分析了截面宽高比、FRP层数、FRP种类对FRP增强重组竹梁受弯性能的影响。发现：FRP层数的增加对重组竹梁极限承载力和截面刚度提升作用显著；相同层数、相同种类FRP增强重组竹梁时，截面高度减小，极限承载力和截面刚度提高幅度增加；相同截面宽高比和FRP层数时，碳纤维增强聚合物基复合材料（CFRP）增强效果优于玄武岩纤维增强聚合物基复合材料（BFRP）增强效果。 The bending performance of bamboo scrimber beams strengthened with fiber reinforced polymer composites (FRP) was analyzed by finite element software ABAQUS. The finite element simulation results are coincident with the experimental results, and the load-displacement curves are consistent and the cross-section strain development process is basically similar. The finite element prediction of bearing capacity has a good accuracy. When the load of 70 kN is applied, the errors of the strain of the cross section is within 13.96%. The maximum error of the predicted bearing capacity is 9.04%. The FRP reinforcement realizes the stress redistribution for bamboo beams and the performance of bamboo in the compression zone may be developed with more efficiency. Moreover, the influences of the aspect ratio, the number of the FRP layers and the FRP type on the bending performance of bamboo beams were investigated by parametric analysis. The increase of the number of FRP layers has a significant improvement effect on the ultimate bearing capacity and cross-sectional stiffness of the bamboo scrimber beams. With a given number of FRP layers and FRP type, the increment of ultimate bearing capacity and cross-sectional stiffness increases as the height of the cross-section reduces, and the enhancement effect of CFRP is better than that of the BFRP with the same cross-sectional height and the same number of FRP layers. 国家自然科学基金（51208262；51778300）；江苏省自然科学基金（BK20151520）；江苏省“333”工程（BRA2016421）和“青蓝工程”项目（QL2017）；江苏高校优势学科建设工程资助项目（PAPD