碳纤维增强复材布加固重组竹破坏梁的受弯性能试验研究

EXPERIMENTAL RESEARCH ON FLEXURAL PROPERTY OF DAMAGED PARALLEL STRAND BAMBOO BEAM REINFORCED BY CFRP

为研究碳纤维增强复材（CFRP）布加固破坏后重组竹梁在荷载作用下的受弯性能,设计4个相同的重组竹对比梁进行4点加载试验,采用位移控制法加载至试件破坏,然后在破坏梁的受拉区粘贴3层CFRP,总厚度为0. 333 mm,采用与对比梁相同的试验方法进行试验研究,得到加固破坏梁的极限承载力及对应的极限位移,并绘制了跨中截面的荷载-挠度曲线,给出了加固破坏后重组竹梁的理论计算方法。结果表明,CFRP加固破坏后的重组竹梁可以恢复到原有的承载力甚至更高,而且加固梁的刚度明显高于对比梁,理论计算方法能较好地反映加固梁的承载力。

In order to investigate the flexural property of damaged parallel strand bamboo （PSB） beams reinforced by carbon fibre reinforced plastic（ CFRP） under monotonic loading,four same beams used as comparative beams were tested with four-point loading,displacement control method was adopted to load on beams untile failure,and the three layers CFRP with a total thickness of 0. 333 mm was bonded on the surface of tensile field of PSB beams,then,the same testing way was adopted on reinforced beams,the ultimate bearing capacity and relative ultimate displacement of reinforced beams were obtained,the loading-displacement of mid-span was drawn,and the theoretical calculating formula of ultimate flexural bearing capacity of reinforced damaged PSB beams was given. The tested results showed that the reinforced damaged beam could return to its original bearing capacity because of CFRP,and the bending stiffness of reinforced damaged beam was higher than that of contrast beams,the theoretical calculating results agreed well with the test results.