粘贴竹板加固预应力混凝土空心板的试验研究

Experimental study on PC hollow-core slab strengthened with bamboo plates

进行了9块粘贴竹板加固预制空心板的对比试验,其中3块为对比试件,6块为粘贴不同宽度和厚度竹板的加固试件.研究结果表明,粘贴不同竹板加固后,预制空心板开裂荷载较未加固对比试件提高5%～96%,平均提高41%;达到允许挠度时的荷载提高8%～76%,平均提高35%;极限荷载提高83%～184%,平均提高123%.各荷载的提高幅度均随竹板厚度和宽度的增加而增大.随荷载增加,加固试件跨中截面沿截面高度应变仍基本符合平截面假定.随着竹板厚度和宽度的增加,相同荷载作用下加固试件受拉边缘中心竹板拉应变和受压边缘中心混凝土压应变均较未加固对比试件有所降低.

An experimental study on strengthening prestressed concrete（PC） hollow-core slabs was conducted.Nine PC hollow-core slabs were tested,including three unstrengthened reference slabs and six slabs strengthened with bamboo plates.The results show that compared with unreinforced slabs,the cracking loads of PC hollow-core slabs strengthened with bamboo plates increase by 5% to 96%（with an average of 41%）,the loads at allowable deflection increase by 8% to 76%（with an average of 35%）,and the ultimate loads increase by 83% to 184%（with an average of 123%）,respectively.All the degrees of improvement in the crack load,allowable load and ultimate load increase with the increase in the thickness and width of the bamboo plates.With the increase in the loads,the strain distribution along the height of the strengthened slabs at the mid-span basically remains a plan-assumption.With the increase in the thickness and width of the bamboo plates,both the bamboo tensile strain on the tensile face and the concrete compressive strain on the compression face of the strengthened slabs decrease under the same load level.