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为研究无腹筋玄武岩纤维(BFRP)筋再生混凝土深受弯构件的破坏模式、开裂荷载、极限荷载、裂缝扩展趋势及变形性能,对9根BFRP筋再生混凝土深受弯构件进行四分点集中力加载试验。考虑影响深受弯构件抗剪性能的主要因素:剪跨比、再生混凝土抗压强度、BFRP筋配筋率、截面有效高度。在此基础上利用ANSYS建立非线性有限元模型进行对比分析。研究结果表明:有限元分析结果与试验结果基本一致;试验梁的抗剪承载力随剪跨比的增大而减小,随纵向BFRP筋配筋率、截面有效高度和再生混凝土抗压强度的提高而呈上升趋势;模拟较好地反映了裂缝发展趋势及BFRP筋的应变;但试验梁的荷载-变形曲线与模拟结果有一定偏差,仍需进一步研究。
In order to study the failure modes, cracking loads, ultimate loads, crack propagation trends and deformation properties of deep-bent concrete-reinforced basalt reinforced concrete (BFRP) bars, four-point concentrated force was applied to nine BFRP-reinforced concrete deep-bending members. Loading test. The main factors affecting the shear performance of deep-flexed members are considered: shear-span ratio, compressive strength of recycled concrete, reinforcement ratio of BFRP, and effective section height. Based on this, using ANSYS to establish a nonlinear finite element model for comparative analysis. The results show that the finite element analysis results are basically consistent with the test results; the shear capacity of the test beams decreases with the increase of the shear span ratio, with the ratio of the longitudinal BFRP reinforcement ratio, the effective section height and the compressive strength of recycled concrete. The increase shows an upward trend; the simulation better reflects the development trend of the cracks and the strain of the BFRP bars; however, the load-deformation curves of the test beams have certain deviations from the simulation results, and further research is needed.