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胶层厚度对预应力CFRP加固混凝土梁粘结应力的影响试验

, PP. 55-62

Keywords: 桥梁工程,梁加固,试验研究,CFRP板材,胶层粘结厚度,界面粘结应力

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Abstract:

?为给预应力碳纤维增强复合材料(CFRP)板材加固混凝土梁的设计与施工提供参考,在不同胶层粘结厚度下,进行预应力CFRP板材加固混凝土梁放张过程中界面应变变化规律及界面粘结应力影响的试验研究。加固试验中,试件初始应力分别为板材极限承载能力的10%,20%,30%,胶层粘结厚度分别为2,4,6mm。通过对试验数据进行数值回归得到了不同胶层粘结厚度的CFRP板材界面粘结应力-放张力计算式。结果表明:CFRP板材界面应变沿板端向跨中逐渐增大,当达到一定粘结长度时应变趋于稳定,且与初始应变接近;胶层粘结厚度为4mm最为合适。

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