碳纤维布加固带裂缝钢筋砼简支梁抗弯性能有限元分析

Finite Element Analysis of Effect on Flexural Bending Capacity of Cracked Reinforced Concrete Simply Beams with Carbon Fiber Cloth

利用ANSYS有限元软件,分别建立两组(每组包含六根钢筋混凝土简支梁)考虑初始荷载的分离式有限元模型进行数值模拟,对加固后梁的破坏形态,屈服承载力、极限承载力提高幅度和碳纤维粘贴层数对加固效果的影响进行了分析.结果表明:梁纵向受拉钢筋的配筋率及碳纤维布粘贴层数与其加固效果密切相关;纵向配筋率较小,受拉钢筋利用越充分的简支梁,其抗弯承载力提高幅度越明显;碳纤维布层数增加并非越多越好,粘贴三或四层时效果最佳.

Considering the finite element model of initial load, 2 groups which were established respectively （each group contained 6 reinforced concrete simply beams）were simulated by the ANSYS finite element software. The paper analyzed the influence of the fracture form, raising rate of the bending capacity and carbon fiber layers on the strengthening effect. The results demonstrated that the strengthening effect was closely bound up with beam longitudinal tension reinforcement ratio and carbon fiber cloth layers. The more adequate the steel reinforcement utilization rate was, the more significantly the bending capacity of the bending component with small longitudinal reinforcement ratio would be improved. It did not mean that more carbon fiber cloth layers was better. The reinforced effect with three or four layers was the best.