CFRP布增强仿木梁的受弯性能试验研究

Experimental study on bending performance of imitation wooden beams reinforced with CFRP sheets

为研究粘贴CFRP布增强仿木梁的受弯性能,对3根分别粘贴1、2和4层CFRP布的增强仿木梁及1根未增强原梁进行了四点弯曲试验,分析了CFRP布粘贴层数对仿木梁破坏形态、受弯承载力、变形及应变发展规律的影响。研究表明:粘贴CFRP布改变了仿木梁的破坏形式,未增强仿木梁和粘贴1层CFRP布的仿木梁发生了受弯破坏,而粘贴2和4层CFRP布的仿木梁发生了剪切破坏;粘贴CFRP布可有效提高仿木梁的受弯承载力和抵抗变形的能力,改善效果随CFRP布粘贴层数的增加而增大,但提升幅度逐渐减小;CFRP布使得仿木梁的抗压强度充分发挥,且仿木梁横截面应变符合平截面假定,此研究可为CFRP布增强仿木梁的理论推导提供试验依据。

In order to study the bending performance of imitation wooden beams reinforced with CFRP sheets,four-point bending tests were carried out on 3 imitation wooden beams reinforced with 1,2 and 4 layers of CFRP sheets and 1 original beam without CFRP sheet,respectively,to analyze the effects of the number of layers of CFRP sheets on the failure form,bending capacity,deformation and strain development of imitation wooden beams.The results show that pasting CFRP sheets changes the failure mode of imitation wooden beams.The bending failure occurs in imitation wooden beams without reinforcement and imitation wooden beams pasted with 1 layer of CFRP sheet,while shear failure occurs in imitation wooden beams pasted with 2 and 4 layers of CFRP sheets.The flexural capacity and deformation resistance of imitation wooden beams can be effectively improved by pasting CFRP sheets,they increase with the number of layers of pasted CFRP sheets,but the improvement magnitude decreases gradually.The compressive strength of imitation wooden material is brought into full play by CFRP sheet,and the cross-section strain accords with the assumption of plain section.This study provides the experimental basis for the theoretical derivation of imitation wooden beams reinforced with CFRP sheets.