CFRP-PCPs复合筋嵌入加固钢筋混凝土梁裂缝试验及计算方法研究

通过5根嵌入不同张拉控制应力的碳纤维增强塑料预应力混凝土棱柱体(CFRP-PCPs)复合筋加固钢筋混凝土梁受弯试验,对比分析试验梁的裂缝分布与发展,得到最大裂缝宽度与平均裂缝宽度在静力荷载作用下的变化特性。结果表明: 嵌入CFRP-PCPs复合筋能有效的减少被加固钢筋混凝土梁的裂缝宽度和高度。在试验基础上,根据国家现行混凝土规范,对平均裂缝间距和最大裂缝宽度计算公式进行参数修正,建立了CFRP-PCPs复合筋嵌入加固钢筋混凝土梁最大裂缝宽度计算公式,计算值与试验值吻合较好。

Experiment and calculation on crack of reinforced concrete beams strengthened with near surface mounted CFRP-PCPs reinforcement

Based on the flexural experimental research of five reinforced concrete beams strengthened with near surface mounted carbon fibre reinforced plastics(CFRP)-prestressed concrete prisms (CFRP-PCPs composite reinforcement) of different control tension stress, the characteristics of mean crack width and maximum crack width were acquired with comparison and analysis of crack distribution and development under static loading. The results indicate that this type of the unique composite reinforcement has an inhibitory effect on development of crack width and crack height. Based on the calculation method for crack width in the current national standard and experimental data, the suggested maximum crack width of the reinforced concrete beams strengthened with near surface mounted CFRP-PCPs reinforcement under static loading was given. And the calculated values are revealed to be in reasonable matching the tested value.