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首先分析比较预应力的施加方法和锚固方式,然后基于一维线弹性理论,对预应力碳纤维增强复合材料(CFRP)板加固钢板体系的受力过程进行分阶段分析,得到在张拉预应力和受载工况下CFRP板、钢板、胶层的应力分布解析式及CFRP有效粘结长度公式、弹性压缩带来的预应力损失值;最后利用ANSYS中Solid95三维单元进行有限元模拟对比分析。结果表明:直接张拉CFRP板能有效控制预应力及其加固效果,比间接法施加预应力有更多优势;采用高强螺栓连接的平板夹具锚传递大部分荷载,改善了非预应力粘贴加固界面的薄弱特点;该理论分析及有限元模型是可靠、有效的。
Firstly, the method of applying prestress and the anchoring method were analyzed and compared. Then, based on the one-dimensional linear elasticity theory, the stress process of steel plate system strengthened by prestressed carbon fiber reinforced composite material (CFRP) The stress distribution of CFRP plate, steel plate and rubber layer under load, the formula of effective bond length of CFRP and the prestress loss caused by elastic compression are also analyzed. Finally, the finite element simulation comparison of Solid95 three-dimensional element in ANSYS is carried out. The results show that the direct tension of CFRP board can effectively control the prestress and its reinforcement effect, which has more advantages than the indirect method of prestressing. The plate anchor with high strength bolt transmits most of the load, which improves the non-prestressed adhesion and reinforcement interface Of the weak features; the theoretical analysis and finite element model is reliable and effective.