论文部分内容阅读
为研究内嵌CFRP筋/片加固木梁的受弯性能,制作5根底面中心内嵌CFRP筋加固试件,3根侧面内嵌CFRP筋加固试件,6根底面中心内嵌CFRP片加固试件以及3根未加固的对比试件,对其进行三分点静载试验。试验参数包括:CFRP筋/片,内嵌位置(底面或侧面),CFRP筋/片数量(1根或2根)、是否采用附加锚固措施(U形铁钉或CFRP布U形箍)、底面是否粘贴CFRP布等。研究表明,内嵌CFRP筋/片加固试件的受弯承载力较未加固试件明显提高,提高幅度为14%～85%,平均提高39%;破坏位移亦平均提高32%。内嵌CFRP筋加固试件的初始弯曲刚度均大于对比试件,而内嵌CFRP片加固试件由于底面开槽面积较大其初始弯曲刚度未见提高。内嵌CFRP筋加固试件的跨中截面应变随荷载增加仍基本符合平截面假定,而内嵌CFRP片加固木梁的跨中截面应变变化与平截面假定存在一定差距。增加内嵌CFRP筋/片的数量及端部采用U形铁钉锚固措施对提高加固木梁承载力的作用不明显;而在加固木梁底面粘贴一层CFRP布可显著提高其加固效果。
In order to study the flexural behavior of CFRP bars / sheets reinforced wood beams, five CFRP bars were embedded in the center of the CFRP bars, three CFRP bars were embedded in the side of the CFRP bars, Pieces, and three unreinforced contrast test pieces were subjected to a one-point static load test. The test parameters include: CFRP bars / sheet, inline position (bottom or side), number of CFRP bars / piece (1 or 2), additional anchoring (U-shaped nails or CFRP cloth U- Whether to paste CFRP cloth. The results show that the flexural capacity of the CFRP / rib reinforced specimens is significantly higher than that of the unconfined specimens, with an increase of 14% ~ 85%, an average increase of 39% and an average of 32% of the damage displacement. The initial bending stiffness of CFRP tendons reinforced specimens is greater than that of the control specimens, while the initial bending stiffness of CFRP specimens is not improved due to the larger groove area. The mid-section cross-section strain of CFRP tendons is still consistent with the assumption of flat section with the increase of load. However, there is a certain gap between the mid-section strain and the cross-section assumption. The effect of increasing the number of embedded CFRP bars / pieces and the U-shaped nail anchoring measures on the bearing capacity of the reinforced wooden beams is not obvious. However, affixing a CFRP cloth on the bottom of the reinforced wooden beams can obviously improve the reinforcement effect.