预应力CFRP板加固钢-混凝土组合梁受弯性能的有限元分析

Finite element analysis study on the flexural behaviour of steel-concrete composite beams strengthened with prestressed CFRP plates

为研究不同设计参数对预应力CFRP板加固钢-混凝土组合梁受弯性能和CFRP板强度贡献率的影响,采用有限元软件Abaqus对万世成论文中的试验构件进行有限元分析,通过对比模拟值、试验值与理论值验证模型的正确性。基于该有限元模型,对CFRP板加固钢-混凝土组合梁进行参数分析,结果表明,增加CFRP板的长度、宽度和厚度以及提高CFRP板的预应力水平,可以明显提升组合梁的抗弯性能。同时,增加H型钢单对称比和腹板宽厚比也可以提高组合梁弹性阶段刚度和抗弯性能。此外,增加CFRP板的长度和腹板宽厚比,提高CFRP板的预应力水平,以及减小CFRP板的截面面积和H型钢单对称比,可以提高CFRP板的强度贡献率。

In order to study the effect of different design parameters on the bending performance of the steel-concrete composite beams strengthened with prestressed CFRP plate and the strength contribution rate of the CFRP plate,finite element analysis is performed based on the experimental work of Wan.The reliability of the model is verified by the comparisons between the simulation results,experimental results and theoretical results.Based on the finite element model,a parametric study on the flexural behaviour of steel-concrete composite beams strengthened with CFRP plates is conducted.The results show that increasing the length,width,thickness and the prestress level of the CFRP plate,significantly improves the bending performance of strengthened composite beams.Besides,increasing the mono-symmetric ratio of the H-beam and the width-thickness ratio of the web can also improve the bending performance of composite beams.Moreover,the strength contribution rate of the CFRP plate increases with the increase of the length and prestress level of the CFRP plate and the width-thickness ratio of the web,but decreases with the increase of the cross-sectional area of the CFRP plate and the mono-symmetric ratio of H-beam.