CFRP加固青白石梁受弯性能试验研究

EXPERIMENTAL STUDY ON FLEXURAL BEHAVIORS OF STONE BEAMS STRENGTHENED BY CFRP

对4个未加固石梁及4个碳纤维布(CFRP)加固石梁进行了受弯性能试验研究,主要分析了未加固石梁与加固石梁在破坏形态、承载能力及变形能力方面的差异。试验结果表明:未加固石梁为典型的脆性破坏,加固石梁则表现出了非完全脆性破坏特征;加固后石梁的极限承载力有所提高,变形能力有所改善。对加固石梁的受弯承载力进行了理论分析,提出了极限受弯承载力的简化计算公式;达到极限荷载后,由于CFRP的作用,石梁仍有一定的承载能力,即承载力裕量,可避免石梁发生突然塌落的严重后果。

The experimental study on flexural behaviors of eight full-scale stone beams(including four beams unstrengthened and four beams strengthened by CFRP) was carried out. The failure modes, flexural capacity and deformability were analyzed. The experimental results show that the unstrengthened stone beams exhibit a typical brittle failure mode while the strengthened stone beams demonstrate a partially brittle failure mode when they are damaged. Furthermore, the flexural capacity and deformation capacity of the strengthened stone beams are improved to some extent. The theoretical analysis of the flexural capacity of the strengthened stone beams was conducted, and a simplified calculation formula of the ultimate flexural capacity was proposed. After reaching the ultimate load, the strengthened stone beams still had certain flexural capacity, namely flexural capacity margin, because of the action of CFRP; this characteristic could avoid the serious consequences of sudden collapse of stone beams.