FRP板长度对混凝土梁破坏影响的试验与数值模拟研究

Numerical simulation and test research of FRP sheet length influence on failure process of reinforced concrete beam

用试验和数值试验方法分析了FRP加固混凝土结构梁的破坏过程,即从加载开始至达到最大载荷,以及失去承载力。通过粘贴不同FRP板长度对于加固后结构的裂缝分布以及承载力的影响,可以看到,FRP板的长度直接影响结构破坏时的最大承载力和梁的变形量,在适当的范围内,FRP板的加固长度越大,梁的极限承载力和梁的变形量越大,而且混凝土梁的底部产生的细小裂缝越多;FRP板很容易产生剥离破坏,所以黏结层也起着非常关键的作用,并且对FRP板的破坏形式起着非常重要的作用。

The failure process of the FRP reinforced concrete beam was analyzed by test and numerical simulation method, characterized as the crack initiation,propagation and final failure of the loading capacities.Based on the examination of the crack distribution rule and load capacities of reinforced concrete structures under different FRP sheet lengths, it was found that the ultimate loading capacity and maximum deflection of the concrete beam was directly influenced by the FRP length, and was increased with the FRP sheet length, and more cracks are also distributed on the bottom of the beam. The deboning failure was prone to occurring, so the bond layer was playing a critical role during the failure process of the FRP reinforced concrete beam.The FRP plate was easy to generate stripping damage,so the bonding layer was very important for the FRP reinforced concrete beam failure mode.